Hello
Yes, you can purchase 2 DNSmanager (or use free versions that are limited by 50 domain names that can be added in the control panel).
However, note that:
Quote:
I want them to contain PTR records for all our IP blocks.
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For this purpose you need to use IPmanager
http://doc.ispsystem.com/index.php/Category:IPmanager
This article will also help you
http://doc.ispsystem.com/index.php/N...nager_as_slave