Internet TCP port 546 is primarily used by the DHCPv6 (Dynamic Host Configuration Protocol for IPv6) client. This protocol is used to obtain network configuration parameters, such as IP addresses, from DHCPv6 servers. Examples of software that use this port include the Windows Server DHCP role and the ISC DHCP server for Unix-based systems. Other network devices, such as routers and switches, may also use this port if they are configured to act as DHCPv6 clients.
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