An Internet Protocol address (IP address) is a numerical label assigned to each connection.The computer uses this to establish the connection.Two versions of the IP are in use: IP Version 4 and IP Version 6.In IPv4 an address consists of 32 bits and the IP v6 uses from 32 to 128 bits.
IP address is of two types,Internal IP and an External IP.
Internal IP is one that each device like computer,printer has.
The external IP is the one through which one gets connected to the internet.The External IP is got from the ISP and is classified into static and dynamic where static IP does not tend to change and the dynamic IP varies each time the modem is switched ON and OFF.You can use Ip-details.com which displays your public/external IP.You can use this to trace their basic location only...