The Internet Assigned Numbers Authority (IANA) is responsible for global coordination of the DNS Root, IP addressing and other Internet protocol resources. This includes the registration of the most common port numbers for well-known Internet services.
The well-known ports, registered ports and dynamic or private ports: The port numbers are divided into three areas. The well-known ports are the 1023rd from 0 Examples include:
* 21: File Transfer Protocol (FTP)
* 22: Secure Shell (SSH)
* 23: Telnet remote login service
* 25: Simple Mail Transfer Protocol (SMTP)
* 53: Domain Name System (DNS) service
* 80: Hyper Text Transfer Protocol (HTTP) on the World Wide Web uses
* 110: Post Office Protocol (POP)
* 119: Network News Transfer Protocol (NNTP)
* 143: Internet Message Access Protocol (IMAP)
* 161: Simple Network Management Protocol (SNMP)
* 443: HTTPS with Transport Layer Security or Secure Sockets Layer (TLS / SSL)
The Registered Ports are the 49151st to 1024 IANA maintains the official list. [1] The dynamic or private ports, 49152 to 65535 A common use is for temporary ports.
