If you are not sure that Port Numbers you are going to use has been assignned for what purpose. You can lookup our TCP ports database and find details related to assignment Port or Protocol assigned by IANA (Internet Assigned Numbers Authority).


Port Numbers and Protocols

TCP and UDP are two different protocols that are used for transmitting data over a network. TCP (Transmission Control Protocol) is a connection-oriented protocol that ensures that data is delivered reliably and in the correct order. UDP (User Datagram Protocol) is a connectionless protocol that does not guarantee the delivery of data or the order in which it is delivered.

Here are some common port numbers that are used by TCP and UDP:

TCP port numbers:

  • Port 80: HTTP (Hypertext Transfer Protocol)
  • Port 443: HTTPS (HTTP Secure)
  • Port 21: FTP (File Transfer Protocol)
  • Port 22: SSH (Secure Shell)
  • Port 25: SMTP (Simple Mail Transfer Protocol)
  • Port 155: NETSC

UDP port numbers:

  • Port : DNS (Domain Name System)
  • Port 67: DHCP (Dynamic Host Configuration Protocol)
  • Port 69: TFTP (Trivial File Transfer Protocol)
  • Port 123: NTP (Network Time Protocol)

Note that these are just a few examples, and there are many other port numbers that are used for various purposes.

For port numbers lookup, the official database of ports and protocols from IANA (Internet Assigned Numbers Authority) is used. IANA is an organization that manages Internet protocol parameters, as well as IP address spaces and top-level domains.

Diffrent Port Number Ranges?

The entire range of port numbers (from 0 to 65535) is divided into three categories.

0 - 1023 Well-Known Ports The 
numbers are reserved by IANA for system processes or network programs with administrative rights. Ports from this category should not be used without registering with IANA.

1024 - 49151 Registered Ports 
Ports registered for use by conventional programs and application layer protocols. This category of ports is most popular for commercial software. Registration is also required to use any port.

49152 - 65535 Dynamic ports 
Designed for free but temporary use. Registration of ports in this category is not possible.


Our Port checker tool allows you to test open ports in your system. You can easily verify if any port is opened or not not by typing your IP address or domain name and desired port number.

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