Port 5684Secure CoAP

Encrypted Constrained Application Protocol traffic for IoT devices and constrained networks.

transport: tcp · udp
in transit: encrypted
assignment: official
risk: 4/10
lookups: 0

also known as coaps, CoAP over DTLS, CoAP over TLS

Technical Details

what runs on :5684

Secure CoAP uses DTLS for the traditional UDP transport and TLS for TCP-based CoAP, normally on port 5684; unencrypted CoAP normally uses port 5683. UDP CoAP has a compact fixed header, tokens, options, and an optional payload, with confirmable messages retransmitted by the protocol; TCP CoAP uses stream framing and does not need CoAP-level retransmission. Deployments commonly authenticate with certificates or pre-shared keys, depending on the device and provisioning model.

Security Information

exposure of :5684

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.0 across 995 ports — this one sits 1.0 above.

in transit

encrypted

payloads are protected on the wire

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Although transport encryption is expected, exposure still reveals a potentially sensitive device API. An attacker can probe resources, send requests, attempt authentication with weak or reused credentials, or exploit vulnerabilities in the CoAP/DTLS/TLS implementation; UDP deployments may also require care to prevent reflection or resource-exhaustion abuse. Internet exposure should generally be restricted to known peers and protected with strong device authentication and rate limits.

Record

iana registry entry

port: :5684
service: Secure CoAP
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 4/10caution
category: Network Services IoT
usage: Port 5684 carries CoAP protected with DTLS over UDP or TLS over TCP, commonly between IoT devices, gateways, and constrained application services. Engineers typically encounter it in sensor, automation, and device-management deployments that need CoAP without exposing application data in cleartext.
lookups: 0rank 994
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 5684
RFC 7252
RFC 7301
RFC 8323

Something wrong?

This record is maintained by the engineers who use port 5684. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-06.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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all 995 in network services →

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:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5684Secure CoAP

Technical Details

Security Information

Related Ports

Port 5684Secure CoAP