Port 5670ZeroMQ Realtime Exchange Discovery

UDP discovery beacons for finding ZeroMQ Realtime Exchange peers on a local network.

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

also known as zre-disc, ZRE, Zyre discovery

1 other service is registered on port 5670. compare all 2 →

Technical Details

what runs on :5670

ZRE discovery uses UDP port 5670 for local-network beacons. Nodes use these beacons to find peers and learn how to reach them; subsequent peer communication uses ZeroMQ connections separately, typically over TCP rather than carrying all messaging on UDP 5670. The port is a discovery endpoint, not a general-purpose ZeroMQ messaging port.

Security Information

exposure of :5670

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 2.6 across 1,657 ports — this one sits 0.6 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

udp

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

security overview

Discovery beacons are not encrypted by default and may reveal peer information to devices on the same network. Treat an unexpected listener as a local-network discovery service: avoid exposing it to the public internet, and use ZeroMQ security features where peer connections cross untrusted networks. Internet-wide exposure is not typical.

Record

iana registry entry

port: :5670
service: ZeroMQ Realtime Exchange Discovery
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port is used by ZRE/Zyre nodes to discover peers on a local network; the assignment is registered to Pieter Hintjens. It is normally encountered on LANs, not as an internet-facing service.
lookups: 0rank 993
added: 2026-10-08
updated: 2026-10-08
references: IANA service name registry — port 5670

Something wrong?

This record is maintained by the engineers who use port 5670. 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
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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 :5670ZeroMQ Realtime Exchange Discovery

Technical Details

Security Information

Related Ports

Port 5670ZeroMQ Realtime Exchange Discovery