Port Checker Tool
Port Checker Tool

A Complete Guide About Port Checker Tool

Port checker tool helps connect with a particular UDP or TCP by sending a network request. It also records the response, and normally there are three responses.

A Complete Guide to Port Checker Tool

A Port checker tool is a computer program that lets you know which ports are open on a system and can receive or send data. 

You can do port scanning to check out the vulnerabilities and weaknesses of your system. Similarly, hackers can also scan your ports and find out which ports are open or closed. This way, they understand how your device works and can steal important information.  

This guide will provide complete information about port scanning techniques, tools, and how you can defend your system from port scanning. So, track us below! 

Protocols Used in Port Scanning 

Two Protocols are used in port scanning, including: 

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

These methods are used for data transmission, but they work differently. 

TCP is a two-way connection-based data transmission that depends on the receiver’s status to complete the task. Hence, it’s reliable.

On the other hand, UDP is unreliable and connectionless. It doesn’t rely on the destination’s status, so it’s not sure whether the data will make it or not. 

What are Ports and Port Numbers?  

Ports are virtual location points that initiate or end networking communication. These are like parking spots where data is exchanged through software, electronic or programming-related mechanisms.  

While the port number is a logical address possessed by every process or application that utilizes the internet or network to communicate. It is used for programming and consistency and helps computers manage the network traffic they are receiving. 

 Port Checker Tool
What are Ports and Port Numbers? 

How Does a Port Checker Tool Works? 

Port checker tool helps connect with a particular UDP or TCP by sending a network request. It also records the response, and normally there are three responses which are listed below: 

  • Accepted, Open 
  • Not listening, closed 
  • Blocked, filtered, dropped 

These responses are useful for both hackers and network administrators. 

The network administrator uses port scanning to discover the weaknesses that hackers can use. This way, the network administrators protect their systems from future attacks. 

Hackers use this knowledge to check out which ports are open and what services are linked with these ports. Even worse, they can generate a fingerprint for future incursion. 

Port Scanning Techniques 

Different port scanning techniques are used for different purposes. Cybercriminals will use a specific technique to intrude into the system. At the same time, the network administrator will use a different technique to protect their system. 

Here we have listed the common scanning techniques:

XMAS Scans

XMAS scans provide information about firewall and network protection. These are hard to detect by firewall and even quieter.  

Ping Scans 

Ping scans are Internet Control Message Protocol (ICMP) requests that send an automated blast of various ICMP to different servers and check who responds. 

It is the simplest yet important scan used as a troubleshooting tool. Sometimes IT administrators disable it with the help of a firewall so the attackers can’t find a network through pings. 

TCP Half Open 

TCP half-open port scan is also known as SYN scan. It’s a popular scanning technique that quickly finds out the open ports on the target device. 

Hackers can also use this sneaky technique since it doesn’t establish a full connection and only sends an SYN message. 


Although UDP scans are less fast than TCP, attackers widely use them. That’s why IT administrators should ensure that their UDP ports are well protected. 

Port Scanner Tools 

  • Nmap
  • PortQryUI 
  • Netcat
  • Advanced Port Checker 
  • Port Authority 
  • Angry IP Scanner 

How You Can Defend Your Work System from Port Scanning 

Do you want to protect your system from port scanner tool ? Then note that it’s inevitable to stop hackers from scanning your ports. However, you can ensure that cybercriminals don’t get access to your user information. 

The following techniques can help you to do that: 

  • Lessen the Number of Devices Connected with the Internet 

Now almost every appliance in our home is connected to the internet. Like air purifiers, lights, security cameras, hard drives, laptops, and computers. 

All of these devices need a port to establish a connection with the internet. As the number of ports increases, so does the risk that hackers will find a flaw in any of these ports. Cybercriminals can even launch an attack from a smart device and can endanger your whole system.

So, reducing the number of devices connected to the internet can help to minimize the risk. 

  • Your Firewall Should be Updated 

Do you know what your first line of protection against security threats is? Your firewall! 

So, make sure to keep your firewall running and update it as often as possible. Then you will timely get notified about the current security threats. 

Read more: Get a Complete Guide Regarding How Much Do Digital Marketers Make

Wrapping Up 

Port scanning provides information about which ports are open. It also tells about the services being used by those ports and the versions of those services. IT engineers use port scanner tool to protect their devices, while hackers use them for intruding into their systems. 

Leave a Response