Port 3565M2PA (MTP2-User Peer-to-Peer Adaptation Layer)

M2PA carries SS7 MTP2 signaling links over IP, typically between signaling points in carrier SIGTRAN networks.

transport: tcp · sctp
in transit: cleartext
assignment: official
risk: 7/10
lookups: 0

also known as MTP2-User Peer-to-Peer Adaptation Layer, SIGTRAN M2PA

Technical Details

what runs on :3565

M2PA (specified in RFC 4165) adapts SS7 MTP2 link behavior for IP networks so MTP3 can use a peer-to-peer signaling link across an IP transport. In standard deployments it runs over SCTP on port 3565: an SCTP association is established, then M2PA link-state procedures perform alignment and proving before user signaling is carried in framed M2PA messages with link sequence numbers. The registry also lists TCP, but SCTP is the transport specified for M2PA by RFC 4165. M2PA is distinct from M2UA (commonly port 2904) and M3UA (commonly port 2905).

Security Information

exposure of :3565

risk score

7/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.7 across 1,415 ports — this one sits 4.3 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

tcp · sctp

every listening transport is another surface to filter at the edge

security overview

M2PA carries telecom signaling, not ordinary application data, and is normally confined to trusted operator signaling networks. It is not encrypted by default and should not be exposed to the public internet; an attacker able to reach it may attempt to disrupt or interfere with signaling, and network-level filtering and access controls are important.

Record

iana registry entry

port: :3565
service: M2PA (MTP2-User Peer-to-Peer Adaptation Layer)
transport: TCPSCTP
encryption: cleartext
assignment: iana registered
risk: 7/10risk
category: Network Services
usage: M2PA is a SIGTRAN protocol that carries SS7 MTP2 link traffic between signaling points over IP, usually in carrier signaling networks. Engineers are most likely to encounter it on private telecom networks or signaling gateways, not on general-purpose internet hosts; the registry does not record a registrant.
lookups: 0rank 993
added: 2026-09-30
updated: 2026-09-30
references: IANA service name registry — port 3565
RFC 4165

Something wrong?

This record is maintained by the engineers who use port 3565. 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 2026-09-30.

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edit this record →back to the registry

Related Ports

all 1,415 in network services →

the 8 most looked-up other ports in network services — 1,415 ports carry that label.

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:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3565M2PA (MTP2-User Peer-to-Peer Adaptation Layer)

Technical Details

Security Information

Related Ports

Port 3565M2PA (MTP2-User Peer-to-Peer Adaptation Layer)