RDNS Vs PTR?

I'm just curious is there a difference. The reason I ask for is because we had PTR zones setup through one hosting company. Upon doing a reverse DNS lookup by the IP it resolves to the domain the IP is pointing to.

On the other hand we was testing another hosting providers service. They set the would setup the RDNS which they did. What's was odd is that the domain name had no PTR record placed in the DNS zone. That being said, every IP address would reverse into server.ourmaindomain.com (every IP).

Do we need to have a PTR record setup on each DNZ zone to make sure they reverse uniquely into each domain?

What do you need exactly?

Do you have a separate IP for every domain?

andreybl said:

What do you need exactly?

Do you have a separate IP for every domain?

Click to expand...

Yes we have one IP address per domain. The issue though was that one hosting company we had the IP's would all return for one domain upon doing a reverse check. They didn't even setup a PTR per DNS zone for each domain. Somehow though the reverse check was coming back, but all IP's to one domain even though we had the domains setup one per IP.

On the other hand, our other host company, implemented a PTR record for each domain name. That being done, upon running a reverse IP check, it would return to each domain (uniquely). Each IP we would do a reverse check on would return to the domain name it was assigned to.

Does that make sense to you?