Port 518: ntalk
Port 518 is ntalk, the updated version of the Talk protocol for real-time text chat between Unix users. Like the original Talk on port 517, it has fallen out of use.
UDPLegacy protocolsUnencrypted by defaultIANA assigned
| Port number | 518 |
|---|---|
| Service | ntalk (Talk protocol, new version) |
| Protocol | UDP |
| Category | Legacy protocols |
| Default encryption | No |
Security note. Port 518 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 518 used for?
Port 518 is ntalk, the updated version of the Talk protocol for real-time text chat between Unix users. Like the original Talk on port 517, it has fallen out of use.
Is port 518 TCP or UDP?
Port 518 (ntalk) uses UDP.
Is port 518 secure?
Port 518 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 518 on my firewall?
Only if you specifically need ntalk. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.