Author: kanishka10

If you’re learning ethical hacking, penetration testing or cybersecurity, you’ll eventually come across the term OS fingerprinting. One of the first goals during network reconnaissance is understanding what systems are connected to a network. Knowing whether a device is running Windows, Linux or another operating system can help security professionals better understand the environment they are assessing.

This process of identifying an operating system is known as OS fingerprinting.

Think of it like being a detective. You may not see the operating system directly, but by observing how a device behaves and responds to network communication, you can often make an educated guess about what it’s running.

In this beginner-friendly guide, you’ll learn:

• What OS fingerprinting is
• Why it’s important
• How it works
• Types of OS fingerprinting
• Information it can reveal
• Common beginner mistakes
• Safe ways to practice

What is OS Fingerprinting?

OS fingerprinting is the process of identifying the operating system running on a device by analyzing its network behavior and characteristics. The goal is to determine whether a system is running:

• Windows
• Linux
• Unix
• macOS
• Network appliance software
• Embedded operating systems

OS fingerprinting helps build a technical profile of a system without directly logging into it.

In simple terms:

OS fingerprinting is the process of identifying a device’s operating system based on how it responds to network communication.

Why is OS Fingerprinting Important?

Understanding operating systems provides valuable context during security assessments.

Better Understanding of the Environment:

Knowing the operating system helps security professionals understand what type of system they are dealing with.

Improved Asset Identification:

Organizations often have many different devices connected to their networks. OS fingerprinting helps identify them.

Security Assessment Preparation:

Different operating systems may have different security considerations. Understanding the platform helps guide further analysis.

Network Visibility:

OS fingerprinting contributes to building a complete picture of a network environment.

If a hacker or pen tester can find out the operating system of the target system, he/she can know which vulnerabilities to exploit or which payloads to design to gain access to the target system (For example, Windows need EXE payloads whereas Linux systems require .sh payloads).

Why Operating Systems Matter?

Every operating system has unique characteristics. Examples include:

• Network behavior
• Default configurations
• Service implementations
• Communication patterns

These differences create clues that can be observed remotely. Just like handwriting can help identify a person, network behavior can help identify an operating system.

How OS Fingerprinting Works

When devices communicate over a network, they exchange information using protocols. Different operating systems often implement these protocols slightly differently.

Examples include:

• Packet structure
• Response timing
• Protocol settings
• Network characteristics

By analyzing these differences, security professionals can estimate what operating system is running.

Active vs Passive OS Fingerprinting

There are two main approaches to determine a operating system. They are Active and Passive OS fingerprinting.

1. Active OS Fingerprinting:

In Active OS fingerprinting, we directly interact with the target system to determine its operating system. The scanner sends network requests and analyzes the responses.

How It Works

The system is queried. Responses are then compared against known operating system characteristics.

Advantages

• Can provide detailed information
• Often produces accurate results

Disadvantages

• Generates network activity
• Easier to detect

Example

In Active OS Fingerprinting, specially crafted packets are sent to the target system and its responses are analyzed to determine the operating system of target computers. This interaction can be as simple as a ping or a scanner like Nmap. Using ping, we can detect a target operating system by observing the Time To Live (TTL) values as shown below.

Time To Live (TTL) is the amount of time or “hops” that is set to a packet to exist inside a network before discarded by a router. In simple words, it is the period of time that a packet or data should exist on a network before being discarded. This value differs from operating system to operating system. Here are the default TTL values of some operating systems.

Another way to perform Active Foot printing is by sending specially crafted packets to the target system.

2. Passive OS Fingerprinting:

In Passive OS fingerprinting, network traffic is observed without directly interacting with the target. Instead of sending requests, it analyzes existing communication.

How It Works

Traffic is monitored and patterns are examined. No direct probing is required.

Advantages

• Less intrusive
• Harder to detect

Disadvantages

• Requires existing traffic
• May provide less information

In passive OS fingerprinting, a sample of packets coming from the target we are interested in are analyzed. For this purpose, we use a Packet Capture API. It relies on guessing the target OS by observing their TCP/IP implementation. Apart from TTL, this type of fingerprinting will observe window size, Don’t Fragment (DF) bit and Type Of Service (TOS).

Common Clues Used in OS Fingerprinting

Operating systems often reveal subtle differences. Examples include:

1. Network Packet Characteristics:

Different systems may structure network packets differently.

2. Time-to-Live (TTL) Values:

As you have already seen, Operating systems often use different default TTL values. These values can provide useful clues.

3. TCP Behavior:

Systems may implement TCP differently. Small differences can help identify the platform.

4. Service Responses:

Applications running on the system may provide hints about the underlying operating system.

5. Network Configuration Patterns:

Configuration behavior sometimes reveals operating system characteristics.

What Information Can OS Fingerprinting Reveal?

OS fingerprinting does not always provide exact answers. Instead, it often provides estimates.

Examples:

• Likely operating system family
• Possible operating system version
• Device type
• Network appliance identification

This information contributes to a broader understanding of the environment.

OS Fingerprinting and Ethical Hacking

OS fingerprinting is commonly performed during reconnaissance and enumeration. A typical workflow might be as shown below:

1. Information Gathering
2. Host Discovery
3. Port Scanning
4. Service Identification
5. OS Fingerprinting
6. Analysis
7. Reporting

OS fingerprinting helps security professionals understand what systems they are analyzing.

Real-World Example

Imagine a network contains:

• A Windows workstation
• A Linux web server
• A router
• A printer

At first glance, all you may see are IP addresses. OS fingerprinting helps determine what type of devices are behind those addresses. This makes the network much easier to understand.

Why OS Fingerprinting Isn’t Always Perfect

Many beginners assume OS fingerprinting provides exact answers. In reality, results are often estimates. Several factors can affect accuracy.

Firewalls:

Security controls may alter network behavior.

Network Devices:

Routers and security appliances may modify traffic.

Custom Configurations:

Administrators can change default operating system settings.

Similar Implementations:

Different operating systems sometimes behave similarly.

Because of this, OS fingerprinting should be viewed as one piece of evidence—not absolute proof.

Common Beginner Mistakes

Many beginners make these mistakes when learning OS fingerprinting. Please avoid doing them yourself.

Trusting Results Blindly:

Always remember that fingerprinting results are estimates. Verification is important before taking any action based on them.

Ignoring Networking Fundamentals:

Without understanding networking basics, fingerprinting results may seem confusing. Learn:

• IP addresses
• TCP/IP
• Ports
• Routing

These concepts make fingerprinting easier to understand.

Focusing Only on Tools:

Tools provide information. Your job is to interpret it. Understanding the underlying concepts is more important than memorizing commands.

Forgetting Documentation:

Document observations and findings. Good documentation improves learning and professionalism.

Scanning Unauthorized Systems:

Always practice ethically. Only analyze:

• Your own systems
• Home labs
• Educational environments
• Authorized networks

Permission matters.

Safe Ways to Practice

You don’t need access to large networks to be able to practice OS fingerprinting. Beginner-friendly practice options include:

Home Networks:

Observe devices you own.

Virtual Machines:

Create multiple operating systems in a lab environment.

Educational Cybersecurity Platforms:

Many learning environments provide safe practice opportunities.

Local Test Environments:

Build small practice networks and compare system behavior.

Skills Developed Through OS Fingerprinting

Learning OS fingerprinting improves several important cybersecurity skills. They are,

Observation:

Learning to notice subtle clues.

Analysis:

Interpreting technical information.

Investigation:

Connecting multiple pieces of evidence.

Documentation:

Recording findings clearly.

Network Understanding:

Developing deeper networking knowledge.

OS Fingerprinting and Cybersecurity Careers

OS fingerprinting is useful in many cybersecurity roles such as:

• Security Analyst
• Penetration Tester
• Incident Responder
• Network Security Engineer
• Vulnerability Analyst

Understanding how systems identify themselves is a valuable skill across multiple disciplines.

Conclusion

OS fingerprinting is one of the most interesting aspects of network reconnaissance. It demonstrates how much information can be learned simply by observing network behavior. For beginners, OS fingerprinting teaches an important lesson:

Every system leaves clues.

By learning how to recognize those clues, you become better at understanding networks, analyzing systems and conducting security assessments.

Remember:

✔ OS fingerprinting identifies operating systems through network behavior
✔ Active and passive techniques gather information differently
✔ Results are often estimates rather than guarantees
✔ Networking fundamentals improve understanding
✔ Practice should always occur in authorized environments

As you continue learning cybersecurity, OS fingerprinting will become another useful tool in your investigative toolkit.

Hello, aspiring Ethical Hackers. In our previous blogpost on network scanning, you learnt briefly about port scanning. In this article, you will learn about port scanning in detail and different port scanning techniques.

If you’re learning ethical hacking, cybersecurity or network security, you’ve probably come across the term port scanning. Port scanning is one of the most fundamental skills in network reconnaissance and security assessments. That’s because before security professionals can understand the risks facing a system, they first need to know what services are exposed to the network.

That’s where port scanning comes in. Think of a computer like a building. The IP address identifies the building itself, while ports represent individual doors. Some doors may be open, some closed and others may be restricted. Port scanning helps identify which doors are available and what services might be running behind them.

In this beginner-friendly guide, you’ll learn:

• What port scanning is
• Why it’s important
• Common port scanning techniques
• What information port scans reveal
• Common mistakes beginners make
• Safe ways to practice

What is Port Scanning?

Port scanning is the process of checking network ports on a device to determine their status and identify available services. A port scan helps answer questions such as:

• Is the device online?
• Which ports are open?
• Which services are running?
• What systems are exposed to the network?

Port scanning is commonly used during:

• Network assessments
• Security audits
• Troubleshooting
• Asset discovery
• Ethical hacking engagements

In simple terms:

Port scanning helps you discover what services a system is making available to the network.

Understanding Ports

Before learning scanning techniques, it’s important to understand what ports are. A port is a communication endpoint used by network services. Examples of network services include:

• Websites
• Email services
• File transfer services
• Remote administration services

Each service typically listens on one or more ports. Think of it like this:

IP Address:

The building.

Port:

A specific door within the building.

Service:

The activity happening behind that door. Port scanning helps identify which doors are open.

Why is Port Scanning Important?

Port scanning provides visibility into systems. Security professionals use it to:

1. Discover Services:

Identify what services are available.

2. Identify Exposure:

Determine what is accessible from the network.

3. Support Security Assessments:

Understand potential attack surfaces.

4. Troubleshoot Connectivity Issues:

Verify whether services are reachable.

5. Create Asset Inventories:

Build a picture of network resources.

Port States Explained

While scanning ports, The state of the port may be shown as being in one of the six categories given below.

1. Open Ports:

An open port means a service is actively listening for connections. Examples of such services include:

• Web services
• Mail services
• File sharing services

Open ports are often the primary focus of security assessments.

2. Closed Ports:

A closed port is reachable but has no service actively listening. The system is online but the specific port is unavailable.

3. Filtered Ports:

A filtered port means network controls prevent a clear response. This often occurs because of:

• Firewalls
• Filtering devices
• Security controls

Filtered ports can make analysis more difficult.

4. Unfiltered Ports:

An unfiltered port is a port that is accessible but cannot be determined whether it is open or closed. You will see this state only while performing the ACK scan.

5. Closed | filtered Ports:

A port is classified to this state when it can’t be founnd out whether a port is closed or filtered. You will see this result only while performing IDLE scan. 

6. Open | filtered Ports:

A port is classified as open | filtered when it can’t be determined whether a port is open or filtered. This happens for scan types in which open ports give no response. The UDP, IP protocol, FIN, NULL and XMAS scans classify ports this way.

How TCP communication takes place?

In order to better understand the various port scanning techniques, readers need to first understand how comunicaton takes place between programs and applications on internet. You have read in our article on OSI model that the Transport Layer is responsible for reliable data transfer between end systems. Two protocols are mainly used for data transfer between devices and applications. They are:

• Transmission Control Protocol (TCP)
• User Datagram Protocol (UDP)

TCP is used when data accuracy, completeness and flawless delivery of data are important while UDP is used when speed and low latency are more important. Since data accuracy is important in most of the data transfers nowadays, TCP is preferred for most aplications.

To make sure that data is transmitting correctly and completely, Transmission Control Protocol (TCP) uses various flags in the headers. These flags are given below.

TCP Three-Way Handshake

For secure data transmission, TCP uses a technique called the Three-Way Handshake. In this, two devices establish a connection using a Three-Way handshake which is shown below.

1. A client sends a TCP packet to the Server with SYN flag set.
2. The Server responds with a TCP packet with both SYN and ACK flags set.
3. The client replies to the packet with a TCP packet with ACK flag set.

After this 3-way handshake, both client and Server start sending and receiving data. Now, that you understood how TCP communication works, it’s time to see different port scanning techniques.

Common Port Scanning Techniques

There are multiple methods used to determine port status. Beginners should focus on understanding the concepts rather than memorizing technical details.

1. TCP Connect Scan:

One of the simplest scanning techniques. This method attempts to establish a complete network connection with the target service.

How It Works?

The scanner requests a connection. If the connection succeeds, the port is likely open. If it fails, the port is likely closed.

In this scan, port scanner like NMAP sends a TCP packet to a port with the SYN flag set. If the port is open, the target responds with a SYN/ACK flag set to packet. Then Nmap sends ACK packet. If the port is closed, the target sends a RST packet. If the target doesn’t respond, the port can be considered filtered.

Advantages:

• Easy to understand
• Reliable results
• Beginner friendly

Limitations:

• Creates more network activity
• Easier to detect

2. SYN Scan:

A commonly discussed scanning method. Rather than completing a full connection, the scanner checks how the target responds during the initial stages of communication.

In a SYN scan, a port scanner sends a SYN packet to the target port. If the port is open, the target sends a “SYN/ACK” set packet. Then, instead of sending a packet with ACK flag set, the port scanner sends a packet with RST flag set to terminate the connection. Since the Three-way handshake is not complete, it is also known as “half-open” scan. Similarly, since the TCP connection is not complete it is not logged and hence considered a stealthy scan. Also, unlike TCP connect scan, this scan is fast.

Why It’s Popular?

It can provide information efficiently while generating less activity than a full connection.

Beginner Takeaway:

The goal is still the same:

Determine whether a port is open. The difference lies in how the information is gathered.

3. ACK Scan:

Unlike the above two scans, this scan is not used to determine if a port is open or not. In fact, it is used to determine firewall rulesets.  In this scan, a packet with ACK flag set is sent to the target port. Here, both open and closed ports send a packet with RST flag set. These ports are labelled as unfiltered. If the ACK packet is dropped, the port is labelled as filtered.

4. NULL Scan:

In this scan, no flags are set while sending a packet to the target. If no response is received, the port is assigned as open/filtered. If an RST flag is received from the target port, the port is considered closed and if any ICMP unreachable error 3, code,1,2, 9,10 or 13 is received, it is considered as filtered.

5. FIN Scan:

In this scan, a packet with FIN flag set is sent to the target. The result is same as that of NULL scan.

6. XMAS Scan:

In this scan, flags FIN, PSH and URG flags are set to the packet and sent to the target port. The result is same as that of Null scan & FIN scan. Since the packet is lighted up like a Christmas tree when these 3 flags are set, it is known as XMAS scan. Learn about different port scan results.

7. UDP Scanning:

Not all services use the same communication methods. Some services use UDP instead of TCP.

Why UDP Matters?

Certain applications rely on UDP for communication. Examples include:

• DNS services
• Streaming services
• Various network protocols

Challenges:

UDP scans can be slower and harder to interpret. For beginners, understanding that TCP and UDP exist is more important than mastering advanced techniques immediately.

8. Service Detection:

After identifying open ports, the next step is understanding what services are running. Examples include:

• Web applications
• Email systems
• File transfer services

This process helps build a more complete picture of the target system.

9. Version Identification:

Sometimes security professionals attempt to determine:

• Software versions
• Service information
• Configuration details

Understanding software versions helps assess potential risks and maintenance needs.

What Information Can Port Scanning Reveal?

Port scanning can reveal a surprising amount of information. Examples include:

1. Active Hosts:

It reveals which devices are online.

2. Open Services:

It reveals what applications are exposed.

3. Service Types:

The role of different systems.

4. Infrastructure Information:

How systems may be configured.

5. Potential Security Risks:

Exposed services often require further review.

Port Scanning and Ethical Hacking

Port scanning is often part of the reconnaissance and enumeration phases of an assessment. A simplified workflow may look like:

1. Information Gathering
2. Host Discovery
3. Port Scanning
4. Service Identification
5. Vulnerability Analysis
6. Reporting

Port scanning helps bridge the gap between discovering systems and understanding their security posture.

Common Beginner Mistakes

Many beginners make the same mistakes when learning port scanning. You should avoid these.

1. Focusing Only on Open Ports:

Finding an open port is only the beginning. The real value comes from understanding what it means.

2. Ignoring Networking Fundamentals:

Without understanding networking concepts, scan results can seem confusing. Learn:

• IP addresses
• DNS
• TCP
• UDP
• Routing basics

3. Becoming Tool Dependent:

Tools help collect information. Understanding the information is what matters.

4. Not Documenting Results:

Always record:

• Findings
• Observations
• Questions

Documentation is a professional habit worth developing early.

5. Scanning Unauthorized Systems:

This is extremely important. Only perform scans on:

• Systems you own
• Home labs
• Authorized environments
• Educational platforms

Always remain within legal and ethical boundaries.

Safe Ways to Practice

You don’t need a corporate network to learn port scanning.

1. Home Lab Environments:

Create a small network using your own devices.

2. Virtual Machines:

Build isolated practice systems.

3. Training Platforms:

Use environments designed for cybersecurity learning.

4. Personal Systems:

Observe services running on your own devices.

Skills Developed Through Port Scanning

Port scanning helps build valuable cybersecurity skills.

1. Observation:

Learning to identify patterns.

2. Analysis:

Understanding network behavior.

3. Documentation:

Recording technical findings.

4. Troubleshooting:

Investigating unexpected results.

5. Network Awareness:

Developing a deeper understanding of system communication.

Why Every Ethical Hacker Learns Port Scanning

Port scanning remains one of the most fundamental reconnaissance skills because it helps answer a critical question:

What is exposed?

Before assessing security, you need visibility. Port scanning provides that visibility.

Whether you’re pursuing a career in:

• Penetration Testing
• Security Analysis
• Network Security
• Incident Response

Understanding port scanning will continue to be valuable throughout your cybersecurity journey.

Conclusion

Port scanning is one of the first practical skills many ethical hackers learn. It teaches you how systems communicate, how services are exposed and how security professionals gather information about networked devices.

Remember:

✔ Port scanning identifies exposed services
✔ Open ports often indicate active applications
✔ Different scanning techniques gather information in different ways
✔ Understanding results matters more than running tools
✔ Practice should always occur in authorized environments

For beginners, port scanning is an excellent introduction to the world of network reconnaissance and cybersecurity analysis. The concepts you learn here will provide a strong foundation for more advanced security topics in the future.

Hello, aspiring Ethical Hackers. If you’re starting your journey in ethical hacking or cybersecurity, one of the first technical skills you’ll encounter is network scanning. Before security professionals can assess a network’s security, they need to understand what systems are present, which devices are active and what services are running. This helps answer these questions.

Think of it as creating a map of a digital environment. Just as a traveler studies a map before exploring a new city, cybersecurity professionals scan networks to understand their structure before performing further analysis.

What is Network Scanning?

Network scanning is the process of gathering information about devices connected to a network. The goal is to identify,

• Active hosts
• Open ports
• Running services
• Network devices
• Available resources

Network scanning helps security professionals understand what systems exist within a network and how those systems communicate. In simple terms:

Network scanning is the process of discovering and mapping devices and services on a network.

Why is Network Scanning Important?

Before testing security, you need visibility of the network. Network scanning provides that visibility. It helps security professionals,

1. Discover Active Devices:

Networks often contain many connected systems, including:

• Computers
• Servers
• Routers
• Printers
• IoT devices

Scanning helps identify which devices are online.

2. Understand Network Structure:

Scanning provides insight into how devices are connected to each other and organized.

3. Identify Running Services:

Many devices provide services over the network. Examples include:

• Web services
• Email services
• File-sharing services
• Remote administration services

Understanding these services helps build a network profile.

4. Improve Security Awareness:

Organizations often discover forgotten or unmanaged devices through network scanning.

How Network Scanning Fits into Ethical Hacking

Network scanning is usually performed during the reconnaissance and enumeration phases of a security assessment. A typical workflow may look like this:

1. Information Gathering
2. Host Discovery
3. Network Scanning
4. Service Identification
5. Vulnerability Analysis
6. Reporting

Network scanning acts as a bridge between information gathering and deeper security analysis.

Understanding Hosts and Services

Before discussing scanning techniques, it’s important to understand two key concepts. They are Hosts and Services.

Hosts:

A host is any device connected to a network. Examples include:

• Desktop computers
• Servers
• Smartphones
• Network appliances

Each host typically has an IP address.

Services:

Services are programs that communicate over the network. Examples include:

• Web applications
• Email systems
• File-sharing services

Services usually listen on specific ports.

Understanding Ports

Ports are an important concept in networking. Think of a device as an office building. The IP address identifies the building. Ports represent individual doors. Different services use different doors to communicate.

Examples include:

• Web traffic
• Email traffic
• File transfers

Network scanning helps identify which doors are open.

Common Types of Network Scanning

There are several types of network scans. Beginners should focus on understanding what each scan attempts to discover.

1. Host Discovery Scanning:

Host discovery identifies which devices are currently active. The goal is simple:

“Which systems are online?”

This is often the first step in a network assessment.

2. Port Scanning:

Port scanning determines which network ports are open. Open ports often indicate available services.

Examples:

• Web servers
• Remote access services
• Email services

Port scanning helps create a technical inventory of exposed services.

3. Service Detection:

Once open ports are identified, security professionals often determine what services are running.

Examples include:

• Web applications
• Database services
• File transfer services

This helps build a more detailed understanding of the environment.

4. Operating System Identification:

Different operating systems often exhibit unique network characteristics. Network analysis may provide clues about whether a system is running:

• Linux
• Windows
• Network appliance software

This information can be useful during security assessments.

Network Mapping

One of the goals of scanning is creating a network map. A network map may include:

• Active hosts
• Services
• Connections
• Device roles

This visual understanding helps security teams manage and secure environments.

Information Gathered During Network Scanning

Network scans may reveal:

• IP addresses
• Hostnames
• Open ports
• Service information
• Operating system clues
• Network topology information

The collected data helps create a detailed picture of the environment.

Common Beginner Mistakes

Many beginners make similar mistakes when learning network scanning. Avoid these pitfalls.

1. Focusing Only on Tools:

Tools are useful, but understanding the information matters more. The goal is not simply running a scan. The goal is understanding the results.

2. Ignoring Networking Fundamentals:

Without basic networking knowledge, scan results may seem confusing. Learn:

• IP addressing
• Ports
• Protocols
• DNS

These fundamentals make scanning much easier to understand.

3. Forgetting Documentation:

Always record findings. Good documentation helps build professional habits.

4. Scanning Unauthorized Systems:

This is one of the most important rules. Only scan:

• Your own systems
• Practice labs
• Authorized environments

Always stay within legal and ethical boundaries.

Safe Practice Ideas for Beginners

You don’t need a large corporate network to learn network scanning. Safe options include:

Home Lab Networks:

Create a small practice environment using your own devices.

Virtual Machines:

Virtual machines allow you to build isolated environments for learning.

Educational Cybersecurity Labs:

Many training platforms provide safe environments specifically designed for beginners.

Personal Devices:

Explore your own authorized systems to better understand network visibility.

Skills Developed Through Network Scanning

Network scanning teaches more than technical knowledge. It develops important cybersecurity skills such as,

Observation:

Learning to identify patterns and anomalies.

Analysis:

Understanding what discovered information means.

Documentation:

Recording technical findings clearly.

Problem Solving:

Connecting pieces of information together.

Network Awareness:

Understanding how systems communicate.

How Network Scanning Helps Security Teams

Organizations use network scanning for many legitimate purposes. Examples include:

Asset Discovery:

Finding connected devices.

Security Assessments:

Identifying exposed services.

Network Management:

Understanding infrastructure.

Compliance Activities:

Maintaining visibility into systems.

Incident Response:

Supporting investigations.

Network Scanning and Cybersecurity Careers

Network scanning is a foundational skill for many cybersecurity roles. Examples include:

• Security Analyst
• Penetration Tester
• Incident Responder
• Vulnerability Analyst
• Network Security Engineer

Learning network scanning builds a strong foundation for future specialization.

Conclusion

Network scanning is one of the most important skills for cybersecurity beginners. It teaches you how to discover and understand digital environments before performing deeper analysis. Rather than jumping straight into advanced topics, network scanning helps build the mindset of a security professional:

• Observe first
• Gather information
• Analyze findings
• Document results

Remember:

The goal of network scanning isn’t simply finding devices.

The goal is understanding the network. As your cybersecurity skills grow, network scanning will continue to be a valuable tool for investigation, assessment and security improvement.