Offline server.

For an offline server just for you from your pc use 127.0.0.1 everywhere.

i prefer you should use your Lan ip not your Local
to find your Lan ip just go start>run>cmd >type ipconfig and copy the IPv4 ,IP and use it on ur files and client.

and not everywhere ... just use on important places like mapsererinfo.dat / iplist.dat / serverlist.dat and your main.exe
everywhere else you should have 127.0.0.1