Whois + relevent domain
Checks entire records (ALL)
Checks all four versions of site with http codes
Gets nameservers
SOA check againset primary namserver
+ns for check
if fault then use 8.8.8.8
check PTR
Gets MX records then IP (2 per record)
Gets PTR records (up to 12)

creates socker to port 25 to check response
Get spf record, parses and checks records
Looks for all A records and lists ip's and pings with ptr record

Checks SPF against known records

dns propagation

Checks for invalid zone by comparing versions

Get ABN for .au