Port 1523

cichild-lm · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecichild-lm

Frequently asked questions

What is port 1523 used for?

Port 1523 is registered with the IANA for cichild-lm (TCP/UDP). Description: cichild.

Is port 1523 a well-known port?

No. Port 1523 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 1523 is open?

Locally on Linux with ss -tulpn | grep ':1523\b', on Windows with netstat -ano | findstr :1523. To test a remote host use Test-NetConnection <host> -Port 1523 in PowerShell or nc -zv <host> 1523 on Linux/macOS.

How do I open port 1523 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 1523/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1523/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1523" -Direction Inbound -Protocol TCP -LocalPort 1523 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcichild-lmcichild
UDPcichild-lmcichild

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