Port 5281
undo-lm · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | undo-lm |
| Registered | 2010-04-19 |
| Modified | 2019-01-25 |
Frequently asked questions
What is port 5281 used for?
Port 5281 is registered with the IANA for undo-lm (TCP/UDP). Description: Undo License Manager; Reserved.
Is port 5281 a well-known port?
No. Port 5281 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 5281 is open?
Locally on Linux with ss -tulpn | grep ':5281\b', on Windows with netstat -ano | findstr :5281. To test a remote host use Test-NetConnection <host> -Port 5281 in PowerShell or nc -zv <host> 5281 on Linux/macOS.
How do I open port 5281 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 5281/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5281/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5281" -Direction Inbound -Protocol TCP -LocalPort 5281 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | undo-lm | Undo License Manager |
| UDP | – | Reserved |