Port 29118SGs Application Part (SGsAP)

SCTP port for SGsAP signaling between LTE mobility management entities and circuit-switched core nodes.

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

also known as SGs

Technical Details

what runs on :29118

SCTP port 29118 is assigned to SGsAP, specified by 3GPP TS 29.118. SGsAP is the application-layer signaling protocol between an LTE Mobility Management Entity (MME) and an MSC/VLR; its messages support procedures such as location updating, paging for circuit-switched services, circuit-switched fallback, and SMS transfer. SGsAP PDUs are carried over an SCTP association; the protocol defines its own message types and information elements rather than using a text-based request/response format. The port is intended for the SGs interface in a mobile core, not general Internet services.

Security Information

exposure of :29118

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 1,956 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

sctp

every listening transport is another surface to filter at the edge

security overview

SGsAP does not encrypt traffic by itself. It is intended to operate between trusted mobile-core nodes, with any protection provided by the operator's network controls or additional security mechanisms. A reachable endpoint could be exposed to unsolicited signaling and denial-of-service or protocol-state abuse; restrict SCTP access to authorized MME and MSC/VLR peers and do not expose this port publicly.

Record

iana registry entry

port: :29118
service: SGs Application Part (SGsAP)
transport: SCTP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Mobile
usage: SGsAP carries signaling between an LTE MME and a circuit-switched MSC/VLR over the SGs interface. Operators use it for functions including circuit-switched fallback and SMS delivery over SGs. It is normally found inside a mobile operator's core network, not on a public-facing host.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 29118

Something wrong?

This record is maintained by the engineers who use port 29118. 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 2026-10-19.

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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 :29118SGs Application Part (SGsAP)

Technical Details

Security Information

Related Ports

Port 29118SGs Application Part (SGsAP)