Port 113
auth and ident · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | auth and ident |
Frequently asked questions
What is port 113 used for?
Port 113 is registered with the IANA for auth and ident (TCP/UDP). Description: ; Authentication Service.
Is port 113 a well-known port?
Yes. Port 113 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 113 is open?
Locally on Linux with ss -tulpn | grep ':113\b', on Windows with netstat -ano | findstr :113. To test a remote host use Test-NetConnection <host> -Port 113 in PowerShell or nc -zv <host> 113 on Linux/macOS.
How do I open port 113 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 113/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=113/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 113" -Direction Inbound -Protocol TCP -LocalPort 113 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | ident | |
| TCP | auth | Authentication Service |
| UDP | auth | Authentication Service |