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15 Common TCP Port numbers you should know.

December 15, 2018 //  by Daniël//  Leave a Comment

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/UDPRTSP (Real Time Streaming Protocol)
631 TCP IPP (Internet Printing Protocol)
 995 TCP POP3 over SSL
Popular TCP/IP Ports

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


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Category: Computers, NetworksTag: Networks

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