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Dear Hurricane Electric,

I love you.



In common configurations, the 64 lower bits (half of the 128 bits available) are used as the “interface identifier” (think of it as the last 8 bits in the typical /24 IPv4 allocations) and the rest are available as the network identifier.  So /64 practically means just one network and you're done; if you wanted to subnet your personal network, you would need to get multiple /64s from tunnel brokers, and assign one prefix to each network, which becomes quite unwieldy after some time.  On the other hand, a single /48 (like HE.net gives you now) allows for 65536 subnets, which you are unlikely to exhaust within any reasonably foreseeable time.  :D