Port 520
efs and router · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | efs and router |
Frequently asked questions
What is port 520 used for?
Port 520 is registered with the IANA for efs and router (TCP/UDP). Description: extended file name server; local routing process (on site); uses variant of Xerox NS routing information protocol - RIP.
Is port 520 a well-known port?
Yes. Port 520 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 520 is open?
Locally on Linux with ss -tulpn | grep ':520\b', on Windows with netstat -ano | findstr :520. To test a remote host use Test-NetConnection <host> -Port 520 in PowerShell or nc -zv <host> 520 on Linux/macOS.
How do I open port 520 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 520/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=520/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 520" -Direction Inbound -Protocol TCP -LocalPort 520 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | efs | extended file name server |
| UDP | router | local routing process (on site); uses variant of Xerox NS routing information protocol - RIP |