This python library is an implementation of RFC 1924.

With this library you can store IPv6 addresses in a more compact form. It's Base85 encoded.

from rfc1924 import *

print(encode("2345:0425:2CA1::0567:5673:23b5")) # -> AN?6(i3Y+yVr74uX@J3P
print(decode("AN?6(i3Y+yVr74uX@J3P")) # -> 2345:0425:2CA1::0567:5673:23b5

Save up to 48% space with this compact form:

ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff -> =r54lj&NUUO~Hi%c2ym0