Port 29168SBc-AP (3GPP Cell Broadcast)

SBc-AP carries cell-broadcast and public-warning signaling between a mobile network’s Cell Broadcast Centre and MME over SCTP.

inNetwork Services Mobile

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

also known as SBc Application Part

Technical Details

what runs on :29168

SBc-AP uses SCTP on port 29168 for signaling between a CBC and an MME, as specified in 3GPP TS 29.168. SCTP establishes an association using its INIT/COOKIE handshake and supports features such as multistreaming and multihoming; SBc-AP messages are ASN.1 encoded. The protocol carries procedures for cell-broadcast message transfer and related control, including warning-message handling. Encryption is not inherent to SBc-AP or SCTP; mobile-network deployments rely on protected operator networks and may use IPsec under 3GPP network-domain security.

Security Information

exposure of :29168

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 1,954 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

This is mobile-core signaling, not a service intended for public internet access. An exposed endpoint could invite association attempts, denial of service, or unauthorized signaling that interferes with cell-broadcast and warning-message handling; restrict it to trusted CBC/MME peers and protect the signaling path with operator network controls and, where deployed, IPsec. Internet-wide scans have not observed it open, consistent with its restricted deployment.

Record

iana registry entry

port: :29168
service: SBc-AP (3GPP Cell Broadcast)
transport: SCTP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Mobile
usage: This is the 3GPP SBc Application Part used between a Cell Broadcast Centre (CBC) and a Mobility Management Entity (MME). Operators use it to deliver cell-broadcast messages, including public-warning alerts, into the mobile network; it is normally found only within an operator’s core network.
lookups: 0rank 993
added: 2026-10-19
updated: 2026-10-19
references: IANA service name registry — port 29168

Something wrong?

This record is maintained by the engineers who use port 29168. 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 :29168SBc-AP (3GPP Cell Broadcast)

Technical Details

Security Information

Related Ports

Port 29168SBc-AP (3GPP Cell Broadcast)