There are restrictions on host name in DNS. According to the Wikipedia, -Host names are restricted to a small subset of the ASCII character set known as LDH, the Letters A–Z in upper and lower case, Digits 0–9, Hyphen, and the dot to separate LDH-labels; see RFC 3696 section 2 for details. This prevented the representation of names and words of many languages natively. +Host names are restricted to a small subset of the ASCII character set known as LDH, the Letters A-Z in upper and lower case, Digits 0–9, Hyphen, and the dot to separate LDH-labels; see RFC 3696 section 2 for details. This prevented the representation of names and words of many languages natively. Thus, we may convert IPv6 address [aaaa:bbbb:cccc:dddd:eeee:ffff:0000:1111] to aaaa-bbbb-cccc-dddd-eeee-ffff-0000-1111.
