List of TCP/UDP Port numbers¶

• Table of contents
• List of TCP/UDP Port numbers
  • Port numbers for test programs
• /etc/services

Below is a list of TCP/UDP port numbers as it is used by Osmocom GSM related software.

L4	Port Number	Purpose	Software
UDP	1984	Osmux	OsmoMGW, OsmoBTS
UDP	2427	MGCP GW	osmo-bsc_mgcp, OsmoMGW
TCP	2775	SMPP	OsmoMSC, OsmoNITB
SCTP	2905	M3UA	OsmoSTP
TCP	3002	A-bis/IP OML	OsmoBTS, OsmoBSC, OsmoNITB
TCP	3003	A-bis/IP RSL	OsmoBTS, OsmoBSC, OsmoNITB
TCP	4200-4219	OsmoCC	osmo-cc
TCP	4222	GSUP	OsmoHLR
TCP	4227	telnet (VTY)	osmo-pcap-client
TCP	4228	telnet (VTY)	osmo-pcap-server
TCP	4236	Control Interface	OsmoTRX
TCP	4237	telnet (VTY)	OsmoTRX
TCP	4238	Control Interface	OsmoBTS
TCP	4239	telnet (VTY)	OsmoSTP
TCP	4240	telnet (VTY)	OsmoPCU
TCP	4241	telnet (VTY)	OsmoBTS
TCP	4242	telnet (VTY)	OsmoNITB, OsmoBSC, cellmgr_ng
TCP	4243	telnet (VTY)	OsmoMGW, osmo-bsc_mgcp
TCP	4244	telnet (VTY)	osmo-bsc_nat
TCP	4245	telnet (VTY)	OsmoSGSN
TCP	4246	telnet (VTY)	osmo-gbproxy
TCP	4247	telnet (VTY)	OsmocomBB
TCP	4249	Control Interface	OsmoNITB/OsmoBSC
TCP	4250	Control Interface	osmo-bsc_nat
TCP	4251	Control Interface	OsmoSGSN
TCP	4252	telnet (VTY)	sysmobts-mgr
TCP	4253	telnet (VTY)	OsmoGTPHub
TCP	4254	telnet (VTY)	OsmoMSC
TCP	4255	Control Interface	OsmoMSC
TCP	4256	telnet (VTY)	Osmo-sip-connector
TCP	4257	Control Interface	OpenGGSN/OsmoGGSN
TCP	4258	telnet (VTY)	OsmoHLR
TCP	4259	Control Interface	OsmoHLR
TCP	4260	telnet (VTY)	OsmoGGSN
TCP	4261	telnet (VTY)	OsmoHNBGW
TCP	4262	Control Interface	OsmoHNBGW
TCP	4263	Control Interface	osmo-gbproxy
TCP	4264	telnet (VTY)	osmo-cbc
TCP	4265	Control Interface	osmo-cbc
UDP	4266	D-GSM MS Lookup: mDNS server	osmo-hlr
TCP	4267	Control Interface	osmo-mgw
TCP	4268	telnet (VTY)	osmo-uecups
SCTP	4268	UECUPS	osmo-uecups
TCP	4269	telnet (VTY)	osmo-e1d
TCP	4270	telnet (VTY)	osmo-isdntap
TCP	4271	telnet (VTY)	OsmoSMLC
TCP	4272	Control Interface	OsmoSMLC
TCP	4273	telnet (VTY)	OsmohNodeB
TCP	4274	Control Interface	OsmohNodeB
TCP	4275	telnet (VTY)	OsmoUPF
TCP	4276	Control Interface	OsmoUPF
TCP	4277	telnet (VTY)	osmo-pfcp-tool
TCP	4278	Control Interface	osmo-pfcp-tool
UDP	4729	GSMTAP	Almost every osmocom project
TCP	5000	A/IP	osmo-bsc_nat
UDP	23000	NS-over-IP	OsmoSGSN,OsmoPCU,osmo-gbproxy
SCTP	29169	RANAP/RUA	OsmoHNBGW
TCP	48049	CBSP (CBC)	OsmoBSC,osmo-cbc

See also:

• https://gitea.osmocom.org/osmocom/libosmocore/src/branch/master/include/osmocom/vty/ports.h
• https://gitea.osmocom.org/osmocom/libosmocore/src/branch/master/include/osmocom/ctrl/ports.h
• https://gitea.osmocom.org/cellular-infrastructure/osmo-gsm-manuals/src/branch/master/common/chapters/port_numbers.adoc

Modifications should be kept in sync between this wiki page, the header files
and the osmo-gsm-manuals.

Port numbers for test programs¶

In addition to above ports, when configuring --with-external-tests, the 'make check' build phase might be using below port numbers for VTY/CTRL/... testing. No production program will use these ports.

L4	Port Number	Purpose	Software
TCP	42042	telnet (VTY)	libosmocore/tests/logging/logging_vty_test
TCP	42043	telnet (VTY)	libosmo-sccp/tests/vty/ss7_asp_vty_test

/etc/services¶

If you are continuously working with osmocom software, as a convenience helper, you might add something like

osmo-pcap-client        4227/tcp
osmo-pcap-server        4228/tcp
osmo-stp                4239/tcp
osmo-pcu                4240/tcp
osmo-bts                4241/tcp
osmo-bsc                4242/tcp        osmo-nitb
osmo-mgw                4243/tcp        osmo-bsc_mgcp
osmo-bsc_nat            4244/tcp
osmo-sgsn               4245/tcp
osmo-gbproxy            4246/tcp
osmocombb               4247/tcp
sysmobts-mgr            4252/tcp
osmo-gtp-hub            4253/tcp
osmo-msc                4254/tcp
osmo-sip-connector      4256/tcp
osmo-hlr                4258/tcp
osmo-ggsn               4260/tcp
osmo-cbc                4264/tcp
osmo-uecups             4268/tcp
osmo-e1d                4269/tcp
osmo-isdntap            4270/tcp
osmo-smlc               4271/tcp
osmo-hnodeb             4273/tcp
osmo-upf                4275/tcp
osmo-pfcp-tool          4278/tcp

to the end of your /etc/services file. This will allow you to do something like telnet localhost osmo-bsc rather than having to remember that the number was 4242.
Alternatively, one can find out the ports open for a process running on the system, for instance osmo-bsc, by running command: ss -lnp | grep osmo-bsc