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Do you have a VPN client, software firewall or other tool installed, that interacts with the TCP/IP stack? I have encountered a few VPN clients in the past introduced odd behavior, like redirecting DNS queries to some unexpected server.

Another explanation would be a service that tries to collect information for some asset management or HW inventory.

Good luck Eddi

PS: In general, Windows systems won't reply to the broadcast message and some Unix systems will. I would be surprised if a router forwards the broadcast message.