Port 5540Matter

Matter smart-home devices use TCP and UDP port 5540 for IPv6 operational communication on local networks.

transport: tcp · udp
in transit: encrypted
assignment: official
risk: 3/10
lookups: 0

also known as Matter Operational Discovery and Communication

Technical Details

what runs on :5540

Matter uses IPv6 and assigns port 5540 for operational communication over both UDP and TCP; UDP is the usual transport, while TCP is available for supported Matter traffic. Messages use Matter's own framing and secure-session mechanisms rather than TLS: commissioning can establish a PASE session, and normal fabric operation typically uses CASE. Operational discovery is separate and commonly uses DNS-SD/mDNS on UDP 5353.

Security Information

exposure of :5540

risk score

3/ 10caution

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

network services averages 2.6 across 1,650 ports — this one sits 0.4 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

Matter operational messages are protected by Matter secure sessions, but that does not make an exposed device safe to reach from the public internet. These endpoints are intended for trusted local networks; restrict access to the relevant LAN or fabric and avoid port forwarding. Discovery metadata may be visible on the local link even though session traffic is encrypted.

Record

iana registry entry

port: :5540
service: Matter
transport: TCPUDP
encryption: tls / encrypted
assignment: iana registered
risk: 3/10caution
category: Network Services IoT
usage: Matter controllers and smart-home devices use this port to communicate after joining the same fabric, typically over Wi-Fi or Thread via a border router. Engineers usually encounter it on a home or building LAN, not as an internet-facing service.
lookups: 0rank 993
added: 2026-10-08
updated: 2026-10-08
references: IANA service name registry — port 5540

Something wrong?

This record is maintained by the engineers who use port 5540. 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 2026-10-08.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 1,650 in network services →

the 8 most looked-up other ports in network services — 1,650 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5540Matter

Technical Details

Security Information

Related Ports

Port 5540Matter