PC Help Jansant - A Guide to TCP/IP Port Numbers

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Well known TCP/IP Ports

An application or process using TCP/IP uses a port to communicate between a client and server. These port numbers generally do not change but can be changed. Using well-known port numbers means computers know which port to use for communication with particular protocols. Below is a brief rundown on well-known port numbers

Port Number	Process	Description
20	FTP - data	File Transfer Protocol - data
21	FTP	File Transfer Protocol - control
23	TELNET	Telnet
25	SMTP	Simple Mail Tranfer Protocol
69	TFTP	Trivial File Transfer Protocol
70	GOPHER	Gopher
80	HTTP	HyperText Transfer Protocol
110	POP3	Post Office Protocol version3
119	NNTP	Network News Tranfer Protocol
123	NTP	Network Time Protocol
443	HTTPS	HyperText Transfer Protocol Secure

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