Is port 639 (MSDP) dangerous?

Port 639 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 639 be open on my firewall?

Port 639 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 639 use?

Port 639 (MSDP) uses the TCP transport protocol and falls under the Other category.

:639 (TCP)

MSDP

Medium Risk

TCP — Other

Port Overview

Port Number 639

Service Name MSDP

Transport Protocol TCP

Category Other

Security Risk Medium

Port Range Well-Known (0-1023)

What is Port 639?

Multicast Source Discovery Protocol (MSDP), defined in RFC 3618, used by PIM-SM to share active multicast source information between Rendezvous Points across different PIM domains.

TCP Other

Security Considerations

Port 639 (MSDP) 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.

Related Ports — Other

35 Private Printer Server 43 WHOIS 63 Whois++ 75 Private Dial-Out Service 78 VetTCP 91 MIT-DOV 92 NPP 104 DICOM

Related Terms

ASN BGP Hijack Data Center Domain Name Dual Stack Internet Exchange Point (IXP)