The potential problem is segmentation. Start assigning meanings to chunks of bits, like routing info or even customer type (mobile, static, etc) or geography, and the bits can get used up pretty quickly. Or put another way the address space becomes sparsely populated but inflexible. I know, "don't do that", well, when they give you (for any "you") that job be sure to send us a postcard... Any resource which is cheap (free!) and seemingly plentiful will get "abused", used in a way the engineers never intended (one word: spam!) Hey, anyone want to buy an ipv6 prefix which spells out their last name or company name when interpreted as UTF-8?! Q00l! :-) -- -Barry Shein The World | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: 800-THE-WRLD | Login: Nationwide Software Tool & Die | Public Access Internet | SINCE 1989 *oo*