A records point to a domain

[Stewart Tolhurst]

I've noticed that a lot of sites can be accessed by the domain name only 
- there is no need for a full hostname (e.g. http://yahoo.com goes to the 
same site as http://www.yahoo.com).  On further investigation into this 
is appears that an A record has been set up for the domain:

from dig yahoo.com

yahoo.com A (Address) 204.71.200.243

Is this kind of thing RFC compliant?  Does it raise any issues or cause 
any potiential problems?

It seems to me that this breaks every DNS convention - but it appears to 
work.

Does anyone have any resources/information on this?

I have customers who are looking for this kind of A record for websites 
and I want to find out a bit more about it before I say yea or nea.

We are using Bind8 on Linux.

Cheers

Stewart

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