Address Literal Tags

(last updated 2008-10-01)

Registries included below:
- Address Literal Tags

Registry: Address Literal Tags
Reference: [RFC5321]
Registration Procedures: Standards Action

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].

Registry:
Tag               Reference
----------------  ---------
IPv6              [RFC5321]

References
----------
[RFC5321]  J. Klensin, "Simple Mail Transfer Protocol", RFC 5321,
           October 2008.

(registry created 2007-11-14)

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