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It depends on the model. By default, they are usually 10.0.1.1 or 192.168.2.1. However, if it has been changed you’ll need to figure it out for yourself. If you’re using a Mac, open Terminal and type ipconfig getpacket en1. This will display your DHCP settings. The number you’re looking for is under server_identifier (ip):.
If you’re using a Windows machine, open command line (shortcut is [WIN] + R and type cmd) then use ipconfig /all and the IP address you need will be under Default Gateway. If you’re using Linux, open Terminal then type ifconfig -a and you'll find the information under option dhcp-server-identifier.