15 Common TCP Port numbers you should know.

15 Common TCP and UDP Port Numbers

A Port number is a 16-bit value (0 – 65535) used to identify a specific process when connecting to a host.

Port numbers from 0 – 1023 are called well known numbers and are used for specific TCP/IP applications.  Numbers from 1024 – 49151 are called registered ports, and ports with numbers 49152 – 65535 are called dynamic or private ports.

TCP (Transmission Control Protocol) is a connection orientated protocol.

UDP (User Datagram Protocol) is a connection less protocol and are simpler and smaller than TCP.

10 Common TCP/IP Port Numbers

Number	TCP/UDP	Description
20/21	TCP	FTP (File Transfer Protocol)
23	TCP	Telnet
25	TCP	SMTP (Simple Mail Transfer Protocol) – Used to send e-mails
53	TCP/UDP	DNS (Domain Name System)
69	UDP	TFTP (Trivial File Transfer Protocol)
80	TCP	HTTP (Hypertext Transfer Protocol)
106	TCP	3COM-TSMUX (Password Server)
110	TCP	POP3 (Post Office Protocol version 3)
427	TCP/UDP	Server Location Protocol
443	TCP	HTTPS (Hypertext Transfer Protocol over SSL)
465	TCP	SMTPS (Simple Mail Transfer Protocol over SSL)
548	TCP	AFP over TCP (Apple Filing Protocol over TCP)
554	TCP/UDP	RTSP (Real Time Streaming Protocol)
631	TCP	IPP (Internet Printing Protocol)
995	TCP	POP3 over SSL

You can find the complete list of Port numbers on iana.org (Internet Assigned Numbers Authority)

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