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Or a letter a through f easy way to think of it like a phone book. there is is a big phone book out there that all computers use to look up addresses. that phone book is huge but it wasnt tall enough. there just werent enough pages in it. >> shepard: should be enough pages now to last for a while. the old system allowed for 4.3 billion unique addresses. thats not even one address for every person on earth. the new system allows for this many addresses. thats more than 340,000,000,000,000,000,000...