buy a whole subnet? i presume you mean 256 addresses?

i agree though, IPV4 is actually addressable to 48 bits which is a huge amount, just requires some coordination at a p2p level

i *can* use ipv6 if i want to but it's just pointless if i want to work with p2p systems, because almost nobody has p2p running on ipv6! 

 Ya, /24 is all I can justify. Plenty to start with 

 Is there a reason ipv6 isn't used for p2p? I assumed it would be easier.