[idn] Re: hostname history hell

["Eric A. Hall" <ehall@ehsco.com>]

"Eric A. Hall" wrote:

> Minimum 2 alphanumeric characters, maximum 63 alphanumeric chars, first
> char alphanumeric, last char alphanumeric. Maximum 255 for FQDN. FQDN
> must contain at least one alpha.

Also note that RFC 1912 (Common DNS Errors) stated that “labels may not be
all numbers” and even cites 411.org. and 1776.com. as domain names that
break this rule. However, RFC 1912 is classified as informational, and
there is no support for this tighter naming restriction in any
standards-track documents. This is the source of some confusion.

-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/