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	Transport Protocol
20, 21	File Transfer Protocol (FTP)	TCP
22	Secure Shell (SSH)	TCP and UDP
23	Telnet	TCP
25	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)	UDP
69	Trivial File Transfer Protocol (TFTP)	UDP
80	HyperText Transfer Protocol (HTTP)	TCP
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
143	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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