Port 374723GPP W1 Application Protocol (W1AP)

W1AP carries control-plane signalling between split ng-eNB central and distributed units over SCTP.

transport: sctp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

Technical Details

what runs on :37472

W1AP uses SCTP on port 37472 and carries control-plane signalling for the W1 interface; it is not a TCP or UDP service. After establishing an SCTP association, the peers exchange W1AP messages encoded using ASN.1 aligned PER, including W1 Setup and procedures for UE context management. SCTP provides reliable, message-oriented transport and supports multiple streams. W1AP does not provide encryption itself; transport protection is deployment-dependent. For comparison, F1AP uses SCTP port 38472, while W1-U is a separate user-plane interface.

Security Information

exposure of :37472

risk score

6/ 10risk

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

network services averages 2.6 across 1,998 ports — this one sits 3.4 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

sctp

every listening transport is another surface to filter at the edge

security overview

This is mobile-network control-plane traffic and should not be exposed to the public internet. Untrusted access or malformed signalling could disrupt the association or affect control-plane procedures; restrict peers to authorized network elements and use operator network protections, such as IPsec where deployed. W1AP itself does not encrypt traffic.

Record

iana registry entry

port: :37472
service: 3GPP W1 Application Protocol (W1AP)
transport: SCTP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Network Services Mobile
usage: W1AP is used on the W1-C control-plane interface between an ng-eNB-CU and ng-eNB-DU in a 5G NG-RAN. Engineers are most likely to encounter it on operator-managed mobile-network infrastructure, not on general-purpose servers.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 37472

Something wrong?

This record is maintained by the engineers who use port 37472. 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.

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :374723GPP W1 Application Protocol (W1AP)

Technical Details

Security Information

Related Ports

Port 374723GPP W1 Application Protocol (W1AP)