knownports / Ports 21000–22999 / Port 21337

Port21337

  • xahaudXahau P2P network protocol

IANA has registered port 21337 to xahaud on TCP; UDP 21337 is held as reserved. Among the 25 dated assignments in ports 21000–22999, its registration on October 16, 2025 is the latest recorded date. No number is assigned for 115 places below it and 215 above, counting all protocols: the widest gap around any of the 38 assigned numbers in the range.

  1. 21212trinket-agent
  2. 21213cohesity-agent
  3. 7 free
  4. 21221aigairserver
  5. 115 free
  6. 21337xahaud
  7. 215 free
  8. 21553rdm-tfs
  9. 21554dfserver
  10. 35 free
  11. 21590vofr-gateway
TCP assignedUDP assignedreservedno entryAll 38 assigned numbers in ports 21000–22999

Registry entries

ServiceProtocolsRegisteredModifiedRFCsOther specs
xahaudTCPOct 16, 2025——xahau.network

Where it sits in the registry

Port 21337 is one of 38 numbers with an assignment in ports 21000–22999 (1.9% of the range). 11 other numbers in the range are assigned on exactly the same transport, TCP. Its first recorded registration, October 16, 2025, is the most recent of the 25 dates recorded in the range.

Status on each protocol

ProtocolOn port 21337Other numbers with the same statusNearest with the same status
TCPassigned to xahaud5,88721221 aigairserver
UDPreserved56621221 aigairserver
SCTPno entry5,99921221 aigairserver
DCCPno entry6,08021221 aigairserver

540 other assigned numbers in the registry have exactly this combination across all four protocols.

The nearest assigned numbers

PortServiceLabelProtocolsRegisteredDistance
21212trinket-agentDistributed artificial intelligenceTCPNov 29, 2017125
21213cohesity-agentCohesity backup agentsTCPAug 1, 2019124
21221aigairserverServices for Air ServerTCPMar 16, 2017116
21553rdm-tfsRaima RDM TFSTCPMay 2, 2011216
21554dfserverMineScape Design File ServerTCPUDPJun 2006217
21590vofr-gatewayVoFR GatewayTCPUDP—253