Port 4729GSMTAP

UDP feed for GSM radio-interface frames, commonly sent from SDR tools to Wireshark or other analysis software.

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

also known as GSM Interface Tap

Technical Details

what runs on :4729

GSMTAP is a datagram format for forwarding GSM radio-interface frames over UDP; UDP port 4729 is its conventional default. Each datagram contains a GSMTAP header with metadata such as the frame type and radio-channel information, followed by the corresponding payload. It has no connection handshake or session setup: senders transmit individual frames to a receiver, commonly a dissector or capture tool.

Security Information

exposure of :4729

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 1,568 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

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

GSMTAP does not provide encryption or authentication. An exposed listener may receive forged or unwanted frames, while a feed sent across an untrusted network can reveal captured signaling and possibly unencrypted GSM traffic. It is generally an analysis interface rather than a service intended for internet exposure; keep it local or restrict it to trusted hosts.

Record

iana registry entry

port: :4729
service: GSMTAP
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Mobile
usage: GSMTAP carries GSM radio-interface data from software-defined radio receivers and related tools to packet analyzers such as Wireshark. Engineers commonly encounter it in Osmocom and gr-gsm workflows, often on a local machine or trusted analysis network.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4729

Something wrong?

This record is maintained by the engineers who use port 4729. 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 2026-10-05.

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edit this record →back to the registry

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all 1,568 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :4729GSMTAP

Technical Details

Security Information

Related Ports

Port 4729GSMTAP