Port 4136

cl-db-request · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecl-db-request

Frequently asked questions

What is port 4136 used for?

Port 4136 is registered with the IANA for cl-db-request (TCP/UDP). Description: Classic Line Database Server Request.

Is port 4136 a well-known port?

No. Port 4136 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4136 is open?

Locally on Linux with ss -tulpn | grep ':4136\b', on Windows with netstat -ano | findstr :4136. To test a remote host use Test-NetConnection <host> -Port 4136 in PowerShell or nc -zv <host> 4136 on Linux/macOS.

How do I open port 4136 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4136/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4136/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4136" -Direction Inbound -Protocol TCP -LocalPort 4136 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcl-db-requestClassic Line Database Server Request
UDPcl-db-requestClassic Line Database Server Request

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