- 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.
Port 9122: Global Relay compliant mobile instant messaging protocol
Port 9122 is assigned by IANA to grcmp (Global Relay compliant mobile instant messaging protocol).
9122
How grcmp works
Other servicesThe client sends a request to port 9122 and the grcmp service answers.
- Transport
- TCP
- 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
Is port 9122 dangerous?
We have no specific security note for port 9122. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 9122
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| grcmp | 9122 | TCP | Global Relay compliant mobile instant messaging protocol | - | 2025-06-12 |
| - | 9122 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 9122, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9122' # process listening on 9122
sudo lsof -nP -i :9122macOS
sudo lsof -nP -i :9122
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9122 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 9122 netstat -ano | findstr :9122
From another machine
nmap -p 9122 -sV <host> nc -zv <host> 9122
Block it in the firewall
sudo ufw deny 9122/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 9122" -Direction Inbound -LocalPort 9122 -Protocol TCP -Action Block # Windows
What is port 9122 used for?
Port 9122 is assigned by IANA to grcmp (Global Relay compliant mobile instant messaging protocol).
Is port 9122 TCP or UDP?
Port 9122 is registered for TCP.
Is it safe to open port 9122?
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 9122 is open?
On Linux run "ss -ltnup 'sport = :9122'", on macOS "lsof -nP -i :9122", and on Windows "netstat -ano | findstr :9122" to see the local process. From another machine, "nmap -p 9122 <host>" shows whether it is reachable.
Other other services ports
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