Port 5683 — CoAP
Quick reference for TCP/UDP port 5683, used by CoAP. Includes what the service does, security guidance and related ports.
Port
5683
Protocol
UDP
Service
CoAP
What is port 5683?
Constrained Application Protocol — IoT.
What port does CoAP use?
CoAP listens on port 5683 by default.
Security guidance
Medium risk — open with care
Port 5683 (CoAP) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 5683 used for?+
Port 5683 is the standard TCP/UDP port for CoAP. Constrained Application Protocol — IoT.
What port does CoAP use?+
CoAP listens on port 5683 by default.
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