Commonly Used Well-Known TCP/UDP Port Numbers

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Commonly Used Well-Known TCP/UDP Port Numbers
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Protocol Port Number
FTP (Default data) 20
FTP (Connection dialog, control) 21
Telnet 23
SMTP 25
DNS 53
DHCP BOOTP Server 67
DHCP BOOTP Client 68
TFTP 69
Gopher 70
HTTP 80
POP3 110
NNTP 119
NetBIOS Session Service 139
Internet Message Access Protocol (IMAP), version 2 143
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