single-character host names

Mike Bernhardt bernhardt at
Thu Feb 26 18:03:07 UTC 2009

Ha ha, I forgot about the root servers. Thanks to a couple of you for the

-----Original Message-----
From: Evan Hunt [mailto:Evan_Hunt at] 
Sent: Wednesday, February 25, 2009 2:15 PM
To: Mike Bernhardt
Cc: bind-users at
Subject: Re: single-character host names

> Certainly, several large organizations (Google, Yahoo and CNN, to name 3)
> are using at least 1: "m"

Not to mention all the root-server operators.  So the rule clearly
isn't being enforced very well. :)

Actually, to be lawyerly about it, while RFC952 says you can't have
a single-character name, it also defines names as including periods
to delimit domain-name components.  So, "" is really a
13-character name, with a single-character component at the beginning,
not a single-character name.

Evan Hunt -- each at
Internet Systems Consortium, Inc.

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