How to Find Your DHCP Server

Windows
open cmd as administrator
run:

ipconfig /all find /i "DHCP Server"

Linux
the DHCP server is usually located in the dhclient.leases file
run:

cat /var/lib/dhcp3/dhclient.leases

or:

grep dhcp-server-identifier /var/lib/dhcp3/dhclient.leases

and look for: “optin dhcp-server-identifier ”

 

Mac
Open Terminal
Run:

ipconfig getpacket en0

(en0 is typically the ethernet adapter.  Wifi is usually en1 or en2)
The “Server_identifier  (ip): ” entry is your DHCP server’s IP address