Port 4191
dsmipv6 · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | dsmipv6 |
| Reference | RFC 5555 |
Frequently asked questions
What is port 4191 used for?
Port 4191 is registered with the IANA for dsmipv6 (TCP/UDP). Description: Reserved; Dual Stack MIPv6 NAT Traversal.
Is port 4191 a well-known port?
No. Port 4191 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 4191 is open?
Locally on Linux with ss -tulpn | grep ':4191\b', on Windows with netstat -ano | findstr :4191. To test a remote host use Test-NetConnection <host> -Port 4191 in PowerShell or nc -zv <host> 4191 on Linux/macOS.
How do I open port 4191 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 4191/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4191/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4191" -Direction Inbound -Protocol TCP -LocalPort 4191 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | – | Reserved |
| UDP | dsmipv6 | Dual Stack MIPv6 NAT Traversal |