knownports / Ports 0–99 / Port 9

Port9

  • discard

IANA has registered port 9 to discard on TCP, UDP, SCTP and DCCP. Its DCCP entry carries service code 1145656131, one of only three service codes in the registry. It is one of the 88 numbers with an SCTP entry and one of the 9 with a DCCP entry.

  1. 1tcpmux
  2. 3 free
  3. 5rje
  4. 1 free
  5. 7echo
  6. 1 free
  7. 9discard
  8. 1 free
  9. 11systat
  10. 1 free
  11. 13daytime
  12. 3 free
  13. 17qotd
TCP assignedUDP assignedSCTP assignedDCCP assignedreservedno entryAll 70 assigned numbers in ports 0–99

Registry entries

ServiceProtocolsRegisteredModifiedRFCsOther specs
discardTCPUDPSCTPDCCP—Feb 7, 2022RFC 4340, RFC 9260—

Cited RFCs

RFCTitlePublishedStatusLater changes
RFC 4340Datagram Congestion Control Protocol (DCCP)March 2006Proposed Standardupdated by RFC 5595, RFC 5596, RFC 6335, RFC 6773
RFC 9260Stream Control Transmission ProtocolJune 2022Proposed Standard—

Listed in SCTP and DCCP port numbers · TCP, UDP, SCTP and DCCP in the port registry