Port 3933

plbserve-port · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceplbserve-port
Registered2003-11

Frequently asked questions

What is port 3933 used for?

Port 3933 is registered with the IANA for plbserve-port (TCP/UDP). Description: PL/B App Server User Port.

Is port 3933 a well-known port?

No. Port 3933 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3933 is open?

Locally on Linux with ss -tulpn | grep ':3933\b', on Windows with netstat -ano | findstr :3933. To test a remote host use Test-NetConnection <host> -Port 3933 in PowerShell or nc -zv <host> 3933 on Linux/macOS.

How do I open port 3933 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3933/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3933/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3933" -Direction Inbound -Protocol TCP -LocalPort 3933 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPplbserve-portPL/B App Server User Port
UDPplbserve-portPL/B App Server User Port

Nearby entries