[Dagger2]

But subnetting in v6 is so much easier than in v4? And it's specifically because of the hex. You don't even need to calculate it, in your head or otherwise, because you just subnet based on characters:

  2001:db8:42:1xxx::/52
  2001:db8:42:2xxx::/52
  2001:db8:42:20xx::/56
  2001:db8:42:21xx::/56
  2001:db8:42:210x::/60
  2001:db8:42:2100::/64
  2001:db8:42:2101::/64

etc. About the only mildly complicated thing is remembering that leading zeros in a number can be dropped but trailing ones can't (i.e. 1 and 001 are the same number, but 1 and 100 are different numbers), but that's something you should've learnt in grade school already.