The address should have eight groups of four hexadecimal
digits, where each group is separated by a colon.
The delimiter should be
colon(:) only. The
dot-decimal notation is not permitted
One or any number of consecutive groups
of leading 0 value may be replaced with two colons (::): For
example, 2001:db8:85a3:0000:0000:8a2e:370:7334 can be written as
2001:db8:85a3::8a2e:370:7334
Network Prefixes are not permitted. For
example,2001:0db8:1234::/48 is
not permitted.
The address should not have more than
one double colon(::).
Unspecified (::) addresses are not
supported.
Link local address and loopback (::1)
may not be permitted on some features of Server
Administrator.