for all addresses, v4 and v6 this is what I used to do 1) convert to a non-space-zeros-compressing hex string 2) sort on the hex string 3) convert back t

for all addresses, v4 and v6 this is what I used to do 1) convert to a non-space-zeros-compressing hex string 2) sort on the hex string 3) convert back through inet_ntop() Only a minor variant needed to deal with prefix/len sort order.