Port 546

dhcpv6-client · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicedhcpv6-client
ReferenceRFC 9915
Modified2018-05-21

Frequently asked questions

What is port 546 used for?

Port 546 is registered with the IANA for dhcpv6-client (TCP/UDP). Description: DHCPv6 Client.

Is port 546 a well-known port?

Yes. Port 546 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 546 is open?

Locally on Linux with ss -tulpn | grep ':546\b', on Windows with netstat -ano | findstr :546. To test a remote host use Test-NetConnection <host> -Port 546 in PowerShell or nc -zv <host> 546 on Linux/macOS.

How do I open port 546 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 546/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=546/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 546" -Direction Inbound -Protocol TCP -LocalPort 546 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPdhcpv6-clientDHCPv6 Client
UDPdhcpv6-clientDHCPv6 Client

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