Have you checked your IP address ?

Have you noticed this ? Your PC’s IP address at office. It generally starts with 10.X.X.X or 172.X.X.X or else with 192. X.X.X. Why ? Off all the zillion options to pick the IP address, why only these three. The reason is RFC 1918.

Each address is a reserved pool in each of the Class A, B and C network-types for private use.

IP address range Address block
10.0.0.0 – 10.255.255.255 10.0.0.0/8
172.16.0.0 – 172.31.255.255 172.16.0.0/12
192.168.0.0 – 192.168.255.255 192.168.0.0/16

###############################################

Side Note: Your can locate your friend’s location by their email. Here’s how
Say if you receive a mail in Gmail

  1. Open the mail.
  2. To display the email headers, click on the inverted triangle beside Reply. Select Show Orginal.
  3. Look for Received: from followed by the IP address between square brackets [ ].
    Received: from [69.138.30.1] by web31804.mail.mud.yahoo.com
  4. Track the location here by entering the IP address here.