Port 3889
dandv-tester · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | dandv-tester |
| Registered | 2003-10 |
Frequently asked questions
What is port 3889 used for?
Port 3889 is registered with the IANA for dandv-tester (TCP/UDP). Description: D and V Tester Control Port.
Is port 3889 a well-known port?
No. Port 3889 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 3889 is open?
Locally on Linux with ss -tulpn | grep ':3889\b', on Windows with netstat -ano | findstr :3889. To test a remote host use Test-NetConnection <host> -Port 3889 in PowerShell or nc -zv <host> 3889 on Linux/macOS.
How do I open port 3889 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 3889/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3889/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3889" -Direction Inbound -Protocol TCP -LocalPort 3889 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | dandv-tester | D and V Tester Control Port |
| UDP | dandv-tester | D and V Tester Control Port |