Port 2123
gtp-control · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | gtp-control |
Frequently asked questions
What is port 2123 used for?
Port 2123 is registered with the IANA for gtp-control (TCP/UDP). Description: GTP-Control Plane (3GPP).
Is port 2123 a well-known port?
No. Port 2123 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 2123 is open?
Locally on Linux with ss -tulpn | grep ':2123\b', on Windows with netstat -ano | findstr :2123. To test a remote host use Test-NetConnection <host> -Port 2123 in PowerShell or nc -zv <host> 2123 on Linux/macOS.
How do I open port 2123 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 2123/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=2123/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 2123" -Direction Inbound -Protocol TCP -LocalPort 2123 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | gtp-control | GTP-Control Plane (3GPP) |
| UDP | gtp-control | GTP-Control Plane (3GPP) |