How many Ip addresses does a /64 contain? 2^(128-64), or 1.84467441 x 10^19 or thereabouts over nine thousand To put it another way, every /64 is big enough to hold the entire 32 bit IPv4 internet 4 billion times over lol "over nine thousand" qbit_, haha yea that was hilarious quote filed that one qbit_: well, it's true :P aye way true whats the ipv6 equivalent to /24 in ipv4 when it comes to BGP sessions, Whats the smallest prefix that will be in the routing table? Or rather smallest address range ... theoretical, or the smallest that's a good idea? :P you *could* have a /127, but it's actively discouraged. rfc suggests /64 or /126, iirc I don't think you could, I think it's pretty strictly /64. /64 is strongly encouraged, using longer prefixes can/does break things. https://tools.ietf.org/html/rfc3627