To find out the system IP address follow the steps given below:
Go to Start>Run>Cmd
Type as ipconfig or ipconfig/all.
To find out the network IP address visit the site Ip-Details.com .

You can find out your IP address by going to : whatismyipaddress.com/
IP is the abbreviation of Internet Protocol, which is assigned to every device that is connected to the public internet. Normally, IP address has four numbers which are separated by dotted-quad.
IP addresses can be divided into two types: Dynamic IP address and Static IP address.
For more about IP address, you can go to en.wikipedia.org/wiki/IP_address