Port 42509

candrp · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecandrp
Registered2005-08

Frequently asked questions

What is port 42509 used for?

Port 42509 is registered with the IANA for candrp (TCP/UDP). Description: CA discovery response.

Is port 42509 a well-known port?

No. Port 42509 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 42509 is open?

Locally on Linux with ss -tulpn | grep ':42509\b', on Windows with netstat -ano | findstr :42509. To test a remote host use Test-NetConnection <host> -Port 42509 in PowerShell or nc -zv <host> 42509 on Linux/macOS.

How do I open port 42509 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 42509/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=42509/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 42509" -Direction Inbound -Protocol TCP -LocalPort 42509 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcandrpCA discovery response
UDPcandrpCA discovery response

Nearby entries