Showing content from https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml below:
Service Name and Transport Protocol Port Number Registry
0 tcp Reserved 2024-12-20 [RFC6335] 0 udp Reserved 2024-12-20 [RFC6335] tcpmux 1 tcp TCP Port Service Multiplexer [Mark_Lottor] [Mark_Lottor] tcpmux 1 udp TCP Port Service Multiplexer [Mark_Lottor] [Mark_Lottor] 2 tcp Reserved 2025-02-13 De-assigned on 2025-02-13, previously compressnet by [Bernie_Volz] 2 udp Reserved 2025-02-13 De-assigned on 2025-02-13, previously compressnet by [Bernie_Volz] 3 tcp Reserved 2025-02-13 De-assigned on 2025-02-13, previously compressnet by [Bernie_Volz] 3 udp Reserved 2025-02-13 De-assigned on 2025-02-13, previously compressnet by [Bernie_Volz] 4 tcp Unassigned 4 udp Unassigned rje 5 tcp Remote Job Entry [Jon_Postel] [Jon_Postel] rje 5 udp Remote Job Entry [Jon_Postel] [Jon_Postel] 6 tcp Unassigned 6 udp Unassigned echo 7 tcp Echo [Jon_Postel] [Jon_Postel] echo 7 udp Echo [Jon_Postel] [Jon_Postel] 8 tcp Unassigned 8 udp Unassigned discard 9 tcp Discard [Jon_Postel] [Jon_Postel] discard 9 udp Discard [Jon_Postel] [Jon_Postel] discard 9 sctp Discard [Randall_Stewart] [Randall_Stewart] 2022-02-07 [RFC9260] discard 9 dccp Discard [Eddie_Kohler] [Eddie_Kohler] [RFC4340] 1145656131 10 tcp Unassigned 10 udp Unassigned systat 11 tcp Active Users [Jon_Postel] [Jon_Postel] systat 11 udp Active Users [Jon_Postel] [Jon_Postel] 12 tcp Unassigned 12 udp Unassigned daytime 13 tcp Daytime [Jon_Postel] [Jon_Postel] [RFC867] daytime 13 udp Daytime [Jon_Postel] [Jon_Postel] [RFC867] 14 tcp Unassigned 14 udp Unassigned 15 tcp Unassigned [was netstat] 15 udp Unassigned 16 tcp Unassigned 16 udp Unassigned qotd 17 tcp Quote of the Day [Jon_Postel] [Jon_Postel] qotd 17 udp Quote of the Day [Jon_Postel] [Jon_Postel] msp 18 tcp Message Send Protocol (historic) [Rina_Nethaniel] [Rina_Nethaniel] msp 18 udp Message Send Protocol (historic) [Rina_Nethaniel] [Rina_Nethaniel] chargen 19 tcp Character Generator chargen 19 udp Character Generator ftp-data 20 tcp File Transfer [Default Data] [Jon_Postel] [Jon_Postel] ftp-data 20 udp File Transfer [Default Data] [Jon_Postel] [Jon_Postel] ftp-data 20 sctp FTP [Randall_Stewart] [Randall_Stewart] 2022-02-07 [RFC9260] ftp 21 tcp File Transfer Protocol [Control] [Jon_Postel] [Jon_Postel] [RFC959] Defined TXT keys: u=<username> p=<password> path=<path> ftp 21 udp File Transfer Protocol [Control] [Jon_Postel] [Jon_Postel] [RFC959] Defined TXT keys: u=<username> p=<password> path=<path> ftp 21 sctp FTP [Randall_Stewart] [Randall_Stewart] 2022-02-07 [RFC9260] Defined TXT keys: u=<username> p=<password> path=<path> ssh 22 tcp The Secure Shell (SSH) Protocol [RFC4251] Defined TXT keys: u=<username> p=<password> ssh 22 udp The Secure Shell (SSH) Protocol [RFC4251] Defined TXT keys: u=<username> p=<password> ssh 22 sctp SSH [Randall_Stewart] [Randall_Stewart] 2022-02-07 [RFC9260] Defined TXT keys: u=<username> p=<password> telnet 23 tcp Telnet [Jon_Postel] [Jon_Postel] [RFC854] Defined TXT keys: u=<username> p=<password> telnet 23 udp Telnet [Jon_Postel] [Jon_Postel] [RFC854] Defined TXT keys: u=<username> p=<password> 24 tcp any private mail system [Rick_Adams] [Rick_Adams] 24 udp any private mail system [Rick_Adams] [Rick_Adams] smtp 25 tcp Simple Mail Transfer [IESG] [IETF_Chair] 2017-06-05 [RFC-ietf-emailcore-rfc5321bis-43] smtp 25 udp Simple Mail Transfer [IESG] [IETF_Chair] 2017-06-05 [RFC-ietf-emailcore-rfc5321bis-43] 26 tcp Unassigned 26 udp Unassigned nsw-fe 27 tcp NSW User System FE [Robert_Thomas] [Robert_Thomas] nsw-fe 27 udp NSW User System FE [Robert_Thomas] [Robert_Thomas] 28 tcp Unassigned 28 udp Unassigned msg-icp 29 tcp MSG ICP [Robert_Thomas] [Robert_Thomas] msg-icp 29 udp MSG ICP [Robert_Thomas] [Robert_Thomas] 30 tcp Unassigned 30 udp Unassigned msg-auth 31 tcp MSG Authentication [Robert_Thomas] [Robert_Thomas] msg-auth 31 udp MSG Authentication [Robert_Thomas] [Robert_Thomas] 32 tcp Unassigned 32 udp Unassigned dsp 33 tcp Display Support Protocol [Ed_Cain] [Ed_Cain] dsp 33 udp Display Support Protocol [Ed_Cain] [Ed_Cain] 34 tcp Unassigned 34 udp Unassigned 35 tcp any private printer server [Jon_Postel] [Jon_Postel] 35 udp any private printer server [Jon_Postel] [Jon_Postel] 36 tcp Unassigned 36 udp Unassigned time 37 tcp Time [Jon_Postel] [Jon_Postel] time 37 udp Time [Jon_Postel] [Jon_Postel] rap 38 tcp Route Access Protocol [Robert_Ullmann] [Robert_Ullmann] rap 38 udp Route Access Protocol [Robert_Ullmann] [Robert_Ullmann] rlp 39 tcp Resource Location Protocol [Mike_Accetta] [Mike_Accetta] rlp 39 udp Resource Location Protocol [Mike_Accetta] [Mike_Accetta] 40 tcp Unassigned 40 udp Unassigned graphics 41 tcp Graphics graphics 41 udp Graphics name 42 tcp Host Name Server name 42 udp Host Name Server nameserver 42 tcp Host Name Server nameserver 42 udp Host Name Server nicname 43 tcp Who Is nicname 43 udp Who Is mpm-flags 44 tcp MPM FLAGS Protocol mpm-flags 44 udp MPM FLAGS Protocol mpm 45 tcp Message Processing Module [recv] mpm 45 udp Message Processing Module [recv] mpm-snd 46 tcp MPM [default send] [Jon_Postel] [Jon_Postel]
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