2.3. Uppercase or Lowercase
2.3. Uppercase or Lowercase
[RFC4291] does not mention any preference of uppercase or lowercase.
2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa
2001:db8:aaaa:bbbb:cccc:dddd:eeee:AAAA
2001:db8:aaaa:bbbb:cccc:dddd:eeee:AaAa
[RFC4291] does not mention any preference of uppercase or lowercase.
2001:db8:aaaa:bbbb:cccc:dddd:eeee:aaaa
2001:db8:aaaa:bbbb:cccc:dddd:eeee:AAAA
2001:db8:aaaa:bbbb:cccc:dddd:eeee:AaAa