Port 364233GPP SLm Interface Application Protocol

SCTP signaling for 3GPP location services between an MME and a SUPL Location Platform.

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

also known as slmap, SLm

Technical Details

what runs on :36423

Port 36423 is the IANA-assigned SCTP port for the 3GPP SLm Interface Application Protocol (SLmAP). The protocol supports location-service procedures between an MME and an SLP, including signaling associated with SUPL-based positioning. Peers establish an SCTP association before exchanging SLmAP messages; the protocol uses 3GPP-defined ASN.1 messages. SCTP provides transport reliability and multistreaming, but does not itself encrypt traffic. Deployments are normally confined to the mobile operator's network, and the actual port may be changed by configuration.

Security Information

exposure of :36423

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 1,995 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 port should not be exposed to the public internet. SLmAP is mobile-core signaling involving location services; an exposed listener could invite probing or attempts to interfere with or disclose sensitive signaling. Restrict access to authorized network peers and use the operator's network security controls, such as IPsec where applicable. SCTP does not provide encryption by default.

Record

iana registry entry

port: :36423
service: 3GPP SLm Interface Application Protocol
transport: SCTP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Mobile
usage: In 3GPP mobile networks, SLmAP carries location-service signaling between a Mobility Management Entity (MME) and a SUPL Location Platform (SLP). It is an operator-core signaling service, not a general-purpose application listener.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 36423

Something wrong?

This record is maintained by the engineers who use port 36423. 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 2026-10-20.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 1,995 in network services →

the 8 most looked-up other ports in network services — 1,995 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :364233GPP SLm Interface Application Protocol

Technical Details

Security Information

Related Ports

Port 364233GPP SLm Interface Application Protocol