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// Other services

Port 29118: SGsAP in 3GPP

Port 29118 is assigned by IANA to sgsap (SGsAP in 3GPP).

29118

How sgsap works

Other services
client:29118sgsapresponse client:29118sgsapresponse

The client sends a request to port 29118 and the sgsap service answers.

Transport
SCTP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 29118 dangerous?

We have no specific security note for port 29118. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 29118

ServicePortTransportDescriptionReferenceUpdated
sgsap 29118 SCTP SGsAP in 3GPP - 2009-06-11
-29118-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 29118, and is it reachable?

Linux

sudo ss -ltnup 'sport = :29118'      # process listening on 29118
sudo lsof -nP -i :29118

macOS

sudo lsof -nP -i :29118

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 29118 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 29118
netstat -ano | findstr :29118

From another machine

nmap -p 29118 -sV <host>
nc -zv <host> 29118

Block it in the firewall

sudo ufw deny 29118/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 29118" -Direction Inbound -LocalPort 29118 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 29118 used for?

Port 29118 is assigned by IANA to sgsap (SGsAP in 3GPP).

Is port 29118 TCP or UDP?

Port 29118 is registered for SCTP.

Is it safe to open port 29118?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 29118 is open?

On Linux run "ss -ltnup 'sport = :29118'", on macOS "lsof -nP -i :29118", and on Windows "netstat -ano | findstr :29118" to see the local process. From another machine, "nmap -p 29118 <host>" shows whether it is reachable.

05 Related
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