List of Common Network Port

Most Common protocols that use network ports are provided by the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) at the Transport layer. Ports are identified for each protocol and address combination by 16-bit unsigned numbers, commonly known as the port number.

Ports allow a single host with a single IP address to run network services. Each port number identifies a specific service, and each host can have 65535 ports per IP address. Port use is regulated by the Internet Corporation for Assigning Names and Numbers (ICANN). By ICANN there are three categories of ports.

  • 0 to 1023: Well Know ports
  • 1024 to 49152: Registered Ports assigned to a specific service.
  • 49153 to 65535: Dynamic or Private ports, can be used for other services.
 Port Service
 20, 21
 File Transfer Protocol (FTP)
 22  Secure Shell (SSH)
 TCP and UDP
23  Telnet
 Simple Mail Transfer Protocol (SMTP)  TCP
 51  Internet Message Protocol (IPSec)
 53  Domain Name System (DNS)
 TCP and UDP
 67, 68
 Dynamic Host Configuration Protocol (DHCP) 
 69  Trivial File Transfer Protocol (TFTP)  UDP
 80  HyperText Transfer Protocol (HTTP)
 110  Post Office Protocol (POP3)  TCP
 119  Network News Transport Protocol (NNTP)  TCP
 123  Network Time Protocol (NTP)  UDP
 137-139  NetBIOS  TCP and UDP
 Internet Message Access Protocol (IMAP4)  TCP and UDP
161, 162
 Simple Network Management Protocol (SNMP)  TCP and UDP
 389  Lightweight Directory Access Protocol  TCP and UDP
 443  HTTP with Secure Sockets Layer (SSL)  TCP and UDP
 3389  Remote Desktop Protocol  TCP and UDP
  • (Windows User) To check all the ports defined by IANA.
  • Go to the directory: C:\Windows\System32\drivers\etc.
  • Open the services file in Internet Explorer.

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