IPFYI
:646 (TCP/UDP)

LDP

Medium Risk

TCP/UDP — Other

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Port Overview

Port Number 646
Service Name LDP
Transport Protocol TCP/UDP
Category Other
Security Risk Medium
Port Range Well-Known (0-1023)

What is Port 646?

Label Distribution Protocol (LDP), defined in RFC 5036, used in MPLS networks to distribute label bindings between Label Switching Routers. Fundamental to MPLS traffic engineering and VPN services.

TCP/UDP Other Commonly Used

Security Considerations

Port 646 (LDP) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.

Recommendation: Keep the service updated. Monitor logs for unusual activity.