What is your IP address?
In the most widely installed level of the Internet Protocol (IP)
today, an IP address is a 32-bit number that identifies each sender
or receiver of information that is sent in packets across the
Internet. When you request an HTML page or send e-mail, the
Internet Protocol part of TCP/IP includes your IP address in the
message (actually, in each of the packets if more than one is
required) and sends it to the IP address that is obtained by
looking up the domain name in the Uniform Resource Locator you
requested or in the e-mail address you're sending a note to. At the
other end, the recipient can see the IP address of the Web page
requestor or the e-mail sender and can respond by sending another
message using the IP address it received.