IP Address (Internet Protocol Address) is a unique number to represent a computer in the world. It is impossible for a IP address to be used twice in a internet world.
For internal network, there is three class specific for such purpose.
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
The following information you are going to see are been assigned by your ISP (Internet Service Provider).