Port 3891

rtc-pm-port · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicertc-pm-port
Registered2003-10

Frequently asked questions

What is port 3891 used for?

Port 3891 is registered with the IANA for rtc-pm-port (TCP/UDP). Description: Oracle RTC-PM port.

Is port 3891 a well-known port?

No. Port 3891 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3891 is open?

Locally on Linux with ss -tulpn | grep ':3891\b', on Windows with netstat -ano | findstr :3891. To test a remote host use Test-NetConnection <host> -Port 3891 in PowerShell or nc -zv <host> 3891 on Linux/macOS.

How do I open port 3891 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3891/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3891/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3891" -Direction Inbound -Protocol TCP -LocalPort 3891 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPrtc-pm-portOracle RTC-PM port
UDPrtc-pm-portOracle RTC-PM port

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