Port 5353 — mDNS
Quick reference for TCP/UDP port 5353, used by mDNS. Includes what the service does, security guidance and related ports.
Port
5353
Protocol
UDP
Service
mDNS
What is port 5353?
Multicast DNS — Apple Bonjour, Avahi.
What port does mDNS use?
mDNS listens on port 5353 by default.
Security guidance
Medium risk — open with care
Port 5353 (mDNS) 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 5353 used for?+
Port 5353 is the standard TCP/UDP port for mDNS. Multicast DNS — Apple Bonjour, Avahi.
What port does mDNS use?+
mDNS listens on port 5353 by default.
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