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// Other services

Port 547: DHCPv6 Server

Port 547 is assigned by IANA to dhcpv6-server (DHCPv6 Server).

547

How dhcpv6-server works

Other services
client:547dhcpv6-serverresponse client:547dhcpv6-serverresponse

The client sends a request to port 547 and the dhcpv6-server service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 547 dangerous?

We have no specific security note for port 547. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 547

ServicePortTransportDescriptionReferenceUpdated
dhcpv6-server 547 TCP, UDP DHCPv6 Server RFC 5460 2018-05-21

// source: IANA service name and port number registry

03 Check it

Which program uses port 547, and is it reachable?

Linux

sudo ss -ltnup 'sport = :547'      # process listening on 547
sudo lsof -nP -i :547

macOS

sudo lsof -nP -i :547

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 547 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 547
netstat -ano | findstr :547

From another machine

nmap -p 547 -sV <host>
sudo nmap -sU -p 547 <host>
nc -zv <host> 547

Block it in the firewall

sudo ufw deny 547/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 547" -Direction Inbound -LocalPort 547 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 547 used for?

Port 547 is assigned by IANA to dhcpv6-server (DHCPv6 Server).

Is port 547 TCP or UDP?

Port 547 is registered for TCP and UDP.

Is it safe to open port 547?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 547 is open?

On Linux run "ss -ltnup 'sport = :547'", on macOS "lsof -nP -i :547", and on Windows "netstat -ano | findstr :547" to see the local process. From another machine, "nmap -p 547 <host>" shows whether it is reachable.

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