What’s an Open Port Checker?

Open Port Checker: Every port on your computer has its specific functions. But what is a port checker? And why is it essential? A port scanner is a web-based tool to check the status and availability of every port on your device.

It offers a reliable and swift result in no time. The best part? It is a free tool that is available to all users. So, the next time you want to check the availability of any port, this tool will be of help. Keep on reading to know more about this handy tool.

port checker

Defining a Port

What is a port? Why is it essential?

The term port is used in computer networking. A port is an area where different networks’ connections start and end. A computer’s operating system deals with the port and is software based.

Every separate port is connected to a specific service or task. It is commonly used for specifying a particular function at the software level.

So, why are ports important?

A port helps in identifying and differentiating web traffic. For example, web traffic lands on a separate port, and email traffic on a separate one. Port 25 is for email, while port 80 is for web-based traffic. A computer using a single network connection also has individual ports for different data traffic.

Whenever a packet enters a network, its deaders define which port to go to. Every network request asks for a port, IP, and protocol to fulfill the request’s network address and destination.

Every PC has two types of ports for the network, which are:

  • TCP ( Transmission control protocol) port
  • UDP ( user datagram protocol) port

Port Numbers

Each port has its number for standardization and adoption across devices. A few of the port numbers are:

  1. File transfer protocol is done by ports 20 and 21.
  2. SSH or secure shell’s port number is 22.
  3. Port 23 for Telnet Protocol.
  4. Simple mail transfer protocol (SMTP) is done by port 25.
  5. DNS or the domain name system uses Port 53.
  6. HTTP is done by port 80.
  7. Port 10 for Post Office Protocol, version 3.
  8. Network time protocol uses port 123.
  9. IMAP activities are done by port 143.
  10. Simple Network Management Protocol is done by port 161.
  11. HTTPS/ Hyper Text Transfer Protocol Secure uses port 443.
  12. Port 445 is for Server Message Block.
  13. Internet Security Association and Key Management Protocol’s port number is 500.
  14. Port 3389 for Remote Desktop Protocol (RDP).

Bonus Tip: TCP Ports from 0 to 1023 are the most popular and reserved for applications. While ports 1024-49151 are available for different services and applications. They are semi-reserved ports.

Lastly, ports 49152 and above are free. Anyone can use them, and they’re called public ports.

What’s a Port Scanner

A port scanner or a port checker is an online tool to see the availability and status of ports on your machines. Did you know the research states that ports are the most common and vulnerable ways hackers use to exploit users and break into services?

A port scanner is a free web-based tool that users can use for unlimited searches. Moreover, it doesn’t require any app installation or registration process to start. The best part? It is highly reliable and provides accurate results in no time.

It will swiftly identify open ports in your PC system. In addition, it will quickly show which ports are available for communication. The current status of ports is defined in three ways, which are:


Open or accepted means that the specific port is accessible for traffic.


Closed or not listening means that a particular port is currently in use and not available.


Blocked means that the port has closed off all the traffic and is not accepting any requests or responding.

How to Use a Port Checker

The port checker scanners are the ports of standard machines like Windows services, Ubuntu servers, games, and other software. To use the online port checker, follow these steps:

  1. Open the port-scanner.php website using your web browser.
  2. The port checker will launch and be ready to use.
  3. The tool has some persimmon ports already available. Put in your IP address or domain name to check which ones are open, active, and accepting requests for the specific IP or domain.
  4. Users can also define the custom ports and check if they are open and active.
  5. Press start to begin the checking process. The checker will instantly show the available ports.
  6. If the ports are open, it’ll show ‘Open,’ If they’re not, it’ll display ‘timed out.’

Remember to swiftly check the typical port number and enter the ones you want to study. If you mistakenly put in the wrong port number, it will show a bad result and might delay your work.

Also Check: Difference Between 404 and 404 soft error


Ports are an essential part of every PC system. So, their availability and status are of utmost importance to users. An online port checker tool will help you understand the current situation of the ports available. If you have any queries about the above post please feel free to ask us in the below comment section. Thanks for your visit.

Tags: port checker online, open port check tool extension, check open ports cmd, port forward checker, udp port checker, check open ports Linux, how to open ports on the router, check open ports windows.