Address Literal Tags

Created
2007-11-14
Last Updated
2008-10-01
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Registry included below

Address Literal Tags

Registration Procedure(s)
Standards Action
Reference
[RFC5321]
Note
Sometimes a host is not known to the domain name system and
communication (and, in particular, communication to report and repair
the error) is blocked.  To bypass this barrier a special literal form
of the address is allowed as an alternative to a domain name.  For
IPv4 addresses, this form uses four small decimal integers separated
by dots and enclosed by brackets such as [123.255.37.2], which
indicates an (IPv4) Internet Address in sequence-of-octets form.  For
IPv6 and other forms of addressing that might eventually be
standardized, the form consists of a standardized "tag" that
identifies the address syntax, a colon, and the address itself, in a
format specified as part of the IPv6 standards [17].
Available Formats

CSV
Tag Reference
IPv6 [RFC5321]