Port 6636

mpls-udp-dtls · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicempls-udp-dtls
ReferenceRFC 7510
Registered2015-02-10

Frequently asked questions

What is port 6636 used for?

Port 6636 is registered with the IANA for mpls-udp-dtls (TCP/UDP). Description: Reserved; Encapsulate MPLS packets in UDP tunnels with DTLS..

Is port 6636 a well-known port?

No. Port 6636 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 6636 is open?

Locally on Linux with ss -tulpn | grep ':6636\b', on Windows with netstat -ano | findstr :6636. To test a remote host use Test-NetConnection <host> -Port 6636 in PowerShell or nc -zv <host> 6636 on Linux/macOS.

How do I open port 6636 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 6636/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6636/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6636" -Direction Inbound -Protocol TCP -LocalPort 6636 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCP–Reserved
UDPmpls-udp-dtlsEncapsulate MPLS packets in UDP tunnels with DTLS.

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