knownports / Ports 100–199 / Port 143

Port143

  • imapInternet Message Access Protocol

IANA has registered port 143 to imap on TCP; UDP 143 is held as reserved. The entry cites RFC 3501 and RFC 9051, as does its TLS counterpart imaps on port 993. RFC 9051 obsoleted RFC 3501, so the registry lists both the old and the new document. Its two cited RFCs are the most of any number in ports 100–199.

  1. 140emfis-data
  2. 141emfis-cntl
  3. 142bl-idm
  4. 143imap
  5. 144uma
  6. 145uaac
  7. 146iso-tp0
TCP assignedUDP assignedreservedno entryAll 98 assigned numbers in ports 100–199

Registry entries

ServiceProtocolsRegisteredModifiedRFCsOther specs
imapTCP—Feb 22, 2021RFC 3501, RFC 9051—

Cited RFCs

RFCTitlePublishedStatusLater changes
RFC 3501INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1March 2003Proposed Standardobsoleted by RFC 9051; updated by RFC 4466, RFC 4469, RFC 4551, RFC 5032, RFC 5182 and 8 more
RFC 9051Internet Message Access Protocol (IMAP) - Version 4rev2August 2021Proposed Standard—

Listed in Ports that cite an RFC · Plain and TLS port pairs · Mail ports: smtp, submission, imap and pop3