Port 113: Ident
Port 113 is the Ident protocol, which some servers, notably IRC networks and older mail servers, query to associate a TCP connection with a username. Most home networks and firewalls can safely reject it.
TCPLegacy protocolsUnencrypted by defaultIANA assigned
| Port number | 113 |
|---|---|
| Service | Identification Protocol |
| Protocol | TCP |
| Category | Legacy protocols |
| Default encryption | No |
Security note. Port 113 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 113 used for?
Port 113 is the Ident protocol, which some servers, notably IRC networks and older mail servers, query to associate a TCP connection with a username. Most home networks and firewalls can safely reject it.
Is port 113 TCP or UDP?
Port 113 (Ident) uses TCP.
Is port 113 secure?
Port 113 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 113 on my firewall?
Only if you specifically need Ident. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.