Port 3781

abcvoice-port · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceabcvoice-port
Registered2003-06

Frequently asked questions

What is port 3781 used for?

Port 3781 is registered with the IANA for abcvoice-port (TCP/UDP). Description: ABCvoice server port.

Is port 3781 a well-known port?

No. Port 3781 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3781 is open?

Locally on Linux with ss -tulpn | grep ':3781\b', on Windows with netstat -ano | findstr :3781. To test a remote host use Test-NetConnection <host> -Port 3781 in PowerShell or nc -zv <host> 3781 on Linux/macOS.

How do I open port 3781 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3781/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3781/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3781" -Direction Inbound -Protocol TCP -LocalPort 3781 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPabcvoice-portABCvoice server port
UDPabcvoice-portABCvoice server port

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