Port 5352DNS Long-Lived Queries

DNS extension for keeping queries open and delivering answers when matching records change.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as dns-llq

Technical Details

what runs on :5352

LLQ extends DNS query exchanges with a setup and lease mechanism for persistent queries, after which the server sends DNS-formatted responses as matching records are added, removed, or changed. It can use UDP or TCP on port 5352; DNS message framing is retained, including the two-byte length prefix for TCP. LLQ is separate from ordinary DNS service on port 53 and does not provide encryption by itself.

Security Information

exposure of :5352

risk score

2/ 10safe

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

network services averages 3.0 across 992 ports — this one sits 1.0 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

Traffic is normally cleartext, so query contents and change notifications can be observed or modified by an on-path attacker. An exposed implementation may also consume resources through long-lived or numerous queries; internet exposure is generally unnecessary unless the service is deliberately used for wide-area discovery.

Record

iana registry entry

port: :5352
service: DNS Long-Lived Queries
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: DNS Long-Lived Queries (LLQ) lets a client receive notifications when DNS records matching a query change, rather than polling repeatedly. It is associated with DNS-SD and service-discovery implementations, and is registered to Stuart Cheshire on TCP and UDP port 5352.
lookups: 0rank 994
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 5352
RFC 8764

Something wrong?

This record is maintained by the engineers who use port 5352. 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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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :5352DNS Long-Lived Queries

Technical Details

Security Information

Related Ports

Port 5352DNS Long-Lived Queries