For some additional review on what can be found in DNS, take a look at some of the DNS records available, using one of these resources, or your own:
- https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
- https://support.google.com/a/answer/48090?hl=en
Based on one of the above, or another resource you find, what DNS information do you feel would be most beneficial for your reconnaissance?