Is port 647 (DHCP Failover) dangerous?

Port 647 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 647 be open on my firewall?

Port 647 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 647 use?

Port 647 (DHCP Failover) uses the TCP transport protocol and falls under the System & Infrastructure category.

:647 (TCP)

DHCP Failover

Medium Risk

TCP — System & Infrastructure

Port Overview

Port Number 647

Service Name DHCP Failover

Transport Protocol TCP

Category System & Infrastructure

Security Risk Medium

Port Range Well-Known (0-1023)

What is Port 647?

DHCP Failover Protocol, used between redundant DHCP servers to synchronize lease databases and coordinate address assignment. Essential for high-availability DHCP deployments.

TCP System & Infrastructure Commonly Used

Security Considerations

Port 647 (DHCP Failover) 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 — System & Infrastructure

0 Reserved 1 TCPMUX 2 Management Utility 3 CompressNET 4 Unassigned 5 RJE 6 Unassigned 7 Echo

Related Terms

Bandwidth Latency Packet Loss Ping Throughput ASN