Your IP address is the logical identification (as opposed to a physical address) of your Internet-connected computer or router. It is a number formatted into 4 octets (or words) separated by periods, such as 18.104.22.168. Your IP address is shared with every website you visit, and frequently included in every email you send. But exactly how much can be learned from that IP address? Usually just your Internet Service Provider, and a general idea of where you are geographically. Your ISP, however, probably has records that tie you to your IP address. To learn more, read Bob Rankin on Does My IP Address Reveal My Location?.