We did an earlier postdiscussing IP Addresses. For those of you who prefer a video, here's a discussion of IP Address use.
Here are some useful links about IP addresses:
For a quick look up of your IP Address and demonstration of geo-targeting check out http://whatismyipaddress.com/
Note: Although this tool shows an exact point on a map to illustrate the point, the exact location is actually an approximation. Estimated location information is usually at best available at zip code level.
For information about how an IP address can be used to show the business, university or organization you are coming from, see http://en.wikipedia.org/wiki/List_of_assigned_/8_IP_address_blocks
