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10 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
|20/21||TCP||FTP (File Transfer Protocol)|
|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)|
|110||TCP||POP3 (Post Office Protocol version 3)|
|443||TCP||HTTPS (Hypertext Transfer Protocol over SSL)|
|465||TCP||SMTPS (Simple Mail Transfer Protocol over SSL)|
|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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