The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the
hexadecimal values of the eight 16-bit pieces of the address.
AAAA RDATA format
1 1 1 1 1 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| |
+ +
| IPv6 ADDRESS |
+ +
| |
+ +
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+