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UDP 5684

ProtocolUDP
Port5684
LabelsConstrained Application Protocol Secure (CoAPs)

Synopsis

  • UDP port 5684 is the IANA-assigned default for CoAP secured with DTLS (“coaps”).
  • OMA SpecWorks Lightweight M2M (LwM2M) commonly uses it; real deployments include servers like Eclipse Leshan, AVSystem Coiote IoT Device Management, and Arm Pelion Device Management, with clients such as Anjay and Eclipse Wakaama communicating over coaps on 5684.
  • IoT modem/module vendors (e.g., Quectel and Sierra Wireless) ship LwM2M clients that connect to management platforms on UDP 5684 for secure device management and telemetry.
  • The Thread protocol stack (e.g., OpenThread) uses CoAPS on UDP 5684 for secure commissioning and management exchanges between Commissioners, Joiners, and border routers.
  • CoAP libraries and frameworks—Eclipse Californium, libcoap, and aiocoap—default to listening on 5684 for secure CoAP endpoints in production systems.
  • These are operational, real-world uses; the port is not particularly associated with hacking or exploitation compared to the unsecured CoAP port 5683.

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