Forward lookup zone

[Jeff Stevens]

I have a customer that appears to have a Windows AD do DDNS inserts into 
a forward lookup zone to show IP dotted decimal information, eg like below:

$ORIGIN 1.1.147.wheatland.COM.
10	900	IN	A	10.1.1.147	;Cl=2
$ORIGIN 1.1.81.wheatland.COM.
10	900	IN	A	10.1.1.81	;Cl=2

These 1.1.147 subdomains are getting inserted by Windows AD, so I first 
thought this was a misconfigured AD.  However, I've seen my home ISP in 
NY do tricks like this, you ping an IP address and you get something 
like 1.2.3.4.roc.roadrunner.com.  So, maybe this is what the AD is 
doing?  Is there a proper description of this technique?

Thanks...
-- 
Jeffrey Stevens