Port 8901
jmb-cds2 · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | jmb-cds2 |
Frequently asked questions
What is port 8901 used for?
Port 8901 is registered with the IANA for jmb-cds2 (TCP/UDP). Description: JMB-CDS 2.
Is port 8901 a well-known port?
No. Port 8901 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 8901 is open?
Locally on Linux with ss -tulpn | grep ':8901\b', on Windows with netstat -ano | findstr :8901. To test a remote host use Test-NetConnection <host> -Port 8901 in PowerShell or nc -zv <host> 8901 on Linux/macOS.
How do I open port 8901 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 8901/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=8901/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 8901" -Direction Inbound -Protocol TCP -LocalPort 8901 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | jmb-cds2 | JMB-CDS 2 |
| UDP | jmb-cds2 | JMB-CDS 2 |