Port 2905M3UA (MTP3 User Adaptation)

M3UA carries SS7 MTP3-user signaling, such as ISUP and SCCP, between telecom signaling nodes over IP.

transport: tcp · sctp
in transit: cleartext
assignment: official
risk: 8/10
lookups: 0

also known as SIGTRAN

Technical Details

what runs on :2905

M3UA carries MTP3-user messages—including signaling used by ISUP and SCCP—over IP. The standard SIGTRAN transport is SCTP; IANA also lists TCP for this service, though SCTP is the usual deployment. M3UA messages have a common header and typed parameters, and peers typically establish an ASP state with ASPUP/ASPUP ACK and ASPAC/ASPAC ACK messages before exchanging DATA messages. It is normally found on port 2905 between telecom signaling systems, not on public-facing application servers.

Security Information

exposure of :2905

risk score

8/ 10risk

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

network services averages 2.7 across 1,339 ports — this one sits 5.3 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

M3UA does not encrypt traffic or provide built-in peer authentication. An exposed endpoint may permit signaling injection or disruption, with consequences for telephone-network services; deployments should restrict access to trusted signaling peers and protect the transport, for example with IPsec. It is not normally appropriate to expose this port to the public internet.

Record

iana registry entry

port: :2905
service: M3UA (MTP3 User Adaptation)
transport: TCPSCTP
encryption: cleartext
assignment: iana registered
risk: 8/10risk
category: Network Services Voice and Chat
usage: M3UA is used in carrier and telecom signaling networks to carry SS7 signaling between an application server and a signaling gateway, or between IP signaling peers. It is a SIGTRAN protocol, not a general-purpose application service.
lookups: 0rank 993
added: 2026-09-25
updated: 2026-09-25
references: IANA service name registry — port 2905
RFC 4666

Something wrong?

This record is maintained by the engineers who use port 2905. 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 2026-09-25.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :2905M3UA (MTP3 User Adaptation)

Technical Details

Security Information

Related Ports

Port 2905M3UA (MTP3 User Adaptation)