ARP
This may work depending on your situation. Asssuming a modern MS Windows System:
If you are not communicating with other machines locally, try running an arp -a after booting up.
Or you could do this in a batch file during operation:
arp -d *
ipconfig /release
ipconfig /renew
arp -a
If you only have one entry after running this, the entry is your DHCP server.
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