Port 5354mDNSResponder IPC

Interprocess communication endpoint used by Multicast DNS responder implementations such as Apple Bonjour.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as Bonjour IPC, Multicast DNS Responder IPC

Technical Details

what runs on :5354

This assignment covers IPC with an mDNS responder over TCP and UDP. The IPC protocol and framing are implementation-specific rather than the standard multicast DNS message exchange; the endpoint is associated with mDNSResponder/Bonjour software. Multicast DNS itself normally uses UDP port 5353 on the local link.

Security Information

exposure of :5354

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 3.5 across 726 ports — this one sits 2.5 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

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

The endpoint is intended for local service interaction and should not be exposed directly to the Internet. Because implementations and access controls vary, an externally reachable listener could provide unintended control or information disclosure, but this is an obscure assignment with little expected Internet exposure.

Record

iana registry entry

port: :5354
service: mDNSResponder IPC
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services System
usage: Apple Bonjour and related mDNSResponder implementations use this assignment for communication between applications and the multicast DNS responder. It is normally a host-local service endpoint rather than the multicast DNS wire service, which uses UDP 5353.
lookups: 0rank 994
added: 2026-08-25
updated: 2026-08-25
references: IANA service name registry — port 5354

Something wrong?

This record is maintained by the engineers who use port 5354. 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 2026-08-25.

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edit this record →back to the registry

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all 726 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5354mDNSResponder IPC

Technical Details

Security Information

Related Ports

Port 5354mDNSResponder IPC