They appear to piece together data from various sources. As a result, they have a very complete domain -> IP history.
TODO reverse IP? The fact that they don't seem to have it suggests that they are just making historical reverse IP requests to a third party via some API.
Account creation blacklists common email providers such as gmail to force users to use a "corporate" email address. But using random domains like ciro@cirosantilli.com works fine.
Their data seems to date back to 2008 for our searches.

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