Port 6511
dccp-udp · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | dccp-udp |
| Reference | RFC 6773 |
Frequently asked questions
What is port 6511 used for?
Port 6511 is registered with the IANA for dccp-udp (TCP/UDP). Description: Reserved; Datagram Congestion Control Protocol Encapsulation for NAT Traversal.
Is port 6511 a well-known port?
No. Port 6511 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 6511 is open?
Locally on Linux with ss -tulpn | grep ':6511\b', on Windows with netstat -ano | findstr :6511. To test a remote host use Test-NetConnection <host> -Port 6511 in PowerShell or nc -zv <host> 6511 on Linux/macOS.
How do I open port 6511 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 6511/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6511/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6511" -Direction Inbound -Protocol TCP -LocalPort 6511 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | – | Reserved |
| UDP | dccp-udp | Datagram Congestion Control Protocol Encapsulation for NAT Traversal |