Port 518
ntalk · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | ntalk |
Frequently asked questions
What is port 518 used for?
Port 518 is registered with the IANA for ntalk (TCP/UDP). Description: .
Is port 518 a well-known port?
Yes. Port 518 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 518 is open?
Locally on Linux with ss -tulpn | grep ':518\b', on Windows with netstat -ano | findstr :518. To test a remote host use Test-NetConnection <host> -Port 518 in PowerShell or nc -zv <host> 518 on Linux/macOS.
How do I open port 518 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 518/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=518/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 518" -Direction Inbound -Protocol TCP -LocalPort 518 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ntalk | |
| UDP | ntalk |