Underscores in host names

Wed May 18 10:46:32 UTC 2005

On Wed, May 18, 2005 at 11:05:56AM +0100,
 Tony Finch <dot at dotat.at> wrote 
 a message of 12 lines which said:

> However case insensitivity puts a big spanner in the works.

And the fact that you can use any 8-bits character in a domain name
but nothing says what the encoding is. UTF-8 ? Latin-1 ? Big5 ? (Some
unscrupulous vendors promoted "international domain names" using that
trick.)

Hence the RFC 3490.