Port 748
ris-cm · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | ris-cm |
Frequently asked questions
What is port 748 used for?
Port 748 is registered with the IANA for ris-cm (TCP/UDP). Description: Russell Info Sci Calendar Manager.
Is port 748 a well-known port?
Yes. Port 748 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.
How do I check whether port 748 is open?
Locally on Linux with ss -tulpn | grep ':748\b', on Windows with netstat -ano | findstr :748. To test a remote host use Test-NetConnection <host> -Port 748 in PowerShell or nc -zv <host> 748 on Linux/macOS.
How do I open port 748 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 748/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=748/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 748" -Direction Inbound -Protocol TCP -LocalPort 748 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ris-cm | Russell Info Sci Calendar Manager |
| UDP | ris-cm | Russell Info Sci Calendar Manager |