[growse]

I find v6 addresses no more difficult to remember that v4. It's a question of what you're used to and what you practice, both of which take time and exposure.

I can tell you the prefixes on my home ADSL connection, but not necessarily the ipv4 subnet, just because I work with the V6 addresses so much more often.

[mnd999]

Make them memorable then - Facebook do:

host -6 www.facebook.com www.facebook.com is an alias for star-mini.c10r.facebook.com. star-mini.c10r.facebook.com has IPv6 address 2a03:2880:f158:82:face:b00c:0:25de