The Internet Protocol (continued)

Like your phone system, IP addresses work on the idea of sets and subsets. In the telephone world, the set and subsets consist of:

You can only have one country code 01 in the entire network. But, you can have one area code 978 in country code 01, and one area code 978 in country code 02, and so forth. Every subset of numbers, then, is entirely repeatable in the next higher set of numbers, giving literally millions and millions of possible combinations.