Mult sub-domain -> same ip

[Wes]

I'm don't have much knowledge about DNS but suspect that the folks at my web 
hosting company are also lacking.

I had them create two subdomain entries in their DNS to point toward our 
local server
hq1.dmihotels.com   and
hq2.dmihotels.com

Now from my ISP (comcast) I can get DNS responses for both. From another ISP 
I can only get response for the second and from a third ISP only for the 
first. I suspect it involves the way the DNS entries were created and the 
possibility that some DNS are less flexible in what they "allow" in terms of 
mapping IPs to (sub)domains.

I did some cursory investigation into this but haven't found the definitive 
answer that would allow me to yell at my web hosting (and therefor DNS 
server) company.

Wes