Port
Port 646 — LDP
Port 646 (TCP/UDP) is used by LDP. Label Distribution Protocol (MPLS).
Port 646 at a glance
| Property | Value |
|---|---|
| Port number | 646 |
| Transport | TCP/UDP |
| Service | LDP |
| Category | Well-known port |
What it is used for
Label Distribution Protocol (MPLS).
Security considerations
Restrict to the provider core.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 646 used for?
Port 646 (TCP/UDP) is used by LDP. Label Distribution Protocol (MPLS).
Is port 646 TCP or UDP?
Port 646 uses TCP/UDP.
Is it safe to open port 646?
Restrict to the provider core.
Related
Learn networking hands-on
Master IP addressing, subnetting and Cisco configuration on real lab devices with placement support at Attila Technologies, Ahmedabad.