Port 4728

capmux · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecapmux
Registered2006-06

Frequently asked questions

What is port 4728 used for?

Port 4728 is registered with the IANA for capmux (TCP/UDP). Description: CA Port Multiplexer.

Is port 4728 a well-known port?

No. Port 4728 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4728 is open?

Locally on Linux with ss -tulpn | grep ':4728\b', on Windows with netstat -ano | findstr :4728. To test a remote host use Test-NetConnection <host> -Port 4728 in PowerShell or nc -zv <host> 4728 on Linux/macOS.

How do I open port 4728 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4728/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4728/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4728" -Direction Inbound -Protocol TCP -LocalPort 4728 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcapmuxCA Port Multiplexer
UDPcapmuxCA Port Multiplexer

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