My ISP's private address space has dns entries available on the public net , is this right ?

[donovan jeffrey j]

Greetings

my isp has some private address space which has dns resolution and can be queried from the outside world.

I asked them about this because we use this private address space and it is showing up in our DNS lookups. here was there response;

>    I've discussed this with our systems administrators and have been told that this is performing as expected.  ISP DNS servers do contain information about private adresses that are in use on our network.  If you are utilizing our DNS servers, you will see resolution of private IPs to ISP hostnames when appropriate.  That will not occur using external DNS servers.  You will see resolution of PTD hostnames to private IPs from external servers, but not IP resolution to hostnames.  As long as reverse DNS (IP to hostname) is not propogating, things are functioning normally.

so even from google public dns i see lookups that refer back to a private address space on my ISP's net.

is that right ?
-j