Also, why on earth is the U.S. missing ? Background: I'm from Algiers, Algeria. I lookup what my IP address is from time to time and was interested in the thin

Also, why on earth is the U.S. missing ? Background: I'm from Algiers, Algeria. I lookup what my IP address is from time to time and was interested in the thing. I stumbled on ALGTEL-AS. So I looked it up. I learned about Autonomous Systems, and ASN's, IPv4 diagrams and all that stuff (it's fascinating). What I wanted to know is: Can I, not knowing an IP address of a computer, be able to at least limit the range its IP address eventually belongs to. Maybe at the town level, block, etc, so that I would do a big chunk down, and then use some attributes of the machine I would have to know about to find it. Kind of needle in haystack, where I'd remove the parts of the hay I have a fair degree of confidence the needle isn't in. The answer is: Maybe, why not.