How to find my DHCP server IP address via a command prompt in Windows?

The DHCP server used to obtain an address is included in the output of ipconfig /all.

ipconfig /all | findstr /C:"DHCP Server"

If your computer has static IP then the ipconfig /all will not show the DHCP server on your network. In this case you can use the following command line to display it.

netsh dhcp show server