Port 113 — Ident
Quick reference for TCP/UDP port 113, used by Ident. Includes what the service does, security guidance and related ports.
What is port 113?
Identification protocol used by IRC and SMTP servers.
What port does Ident use?
Ident listens on port 113 by default.
Is port 113 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 113
Test-NetConnection HOST -Port 113
nmap -p 113 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Medium risk — open with care
Port 113 (Ident) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Related ports
Frequently asked
What is port 113 used for?+
Port 113 is the standard TCP/UDP port for Ident. Identification protocol used by IRC and SMTP servers.
What port does Ident use?+
Ident listens on port 113 by default.
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