Retrieving Lan Info

Hi

I am new to this Group. I was wondering if some  one could help me.
I am in university & I often have to plug into various subnets &
Ip-Ranges within the university Lan.

I was wondering if there is some sort of utility to Identify LAN - Ip
Ranges or Subnet.. ???

Any Help shall be highly appreciated :)

Thank you all in advance

G