Port 4342Locator/ID Separation Protocol (LISP) Control

UDP port 4342 carries LISP control messages that resolve and register endpoint identifiers and their routing locators.

transport: udp
in transit: cleartext
assignment: official
risk: 4/10
lookups: 0

also known as lisp-control, LISP

Technical Details

what runs on :4342

LISP control messages use UDP destination port 4342. There is no transport handshake: devices exchange messages such as Map-Request and Map-Reply for EID-to-RLOC lookups, and Map-Register and Map-Notify for registering mappings with a Map-Server. A Map-Resolver can receive requests and forward them toward authoritative mapping information. This is distinct from UDP 4341, used for LISP data-plane encapsulation. Map-Register messages can be authenticated with a shared key, but control traffic is not encrypted by default.

Security Information

exposure of :4342

risk score

4/ 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 1,526 ports — this one sits 1.4 above.

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

This is a network control-plane service, not an ordinary application listener. Expose it only where required for a LISP deployment; restrict peers and apply control-plane protections. Map-Register authentication helps protect registrations, but it does not encrypt traffic or authenticate every message, so an exposed endpoint may face unwanted requests, mapping disclosure, or denial-of-service attempts.

Record

iana registry entry

port: :4342
service: Locator/ID Separation Protocol (LISP) Control
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 4/10caution
category: Network Services
usage: LISP-capable routers and control-plane services use this port to exchange mapping requests, replies, registrations, and notifications. It is encountered in networks that deploy LISP, rather than as a common general-purpose Internet service.
lookups: 0rank 993
added: 2026-10-04
updated: 2026-10-04
references: IANA service name registry — port 4342
RFC 9301

Something wrong?

This record is maintained by the engineers who use port 4342. 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 2026-10-04.

01edit any field on a page of its own
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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 :4342Locator/ID Separation Protocol (LISP) Control

Technical Details

Security Information

Related Ports

Port 4342Locator/ID Separation Protocol (LISP) Control