IP range

I use this for reference
https://znation.nl/cod4script/

But I cant find that function in there. Where can I see all functions?

https://github.com/kungfooman/libcod...master/gsc.cpp

line 203 and below

You can click on the line number to get the anker link: https://github.com/kungfooman/libcod...r/gsc.cpp#L203

And is there any docs how to use them?

For most: yes, look at the link you posted yourself