CIA 2010 covert communication websites / securitytrails.com

They appear to piece together data from various sources. This is the most complete historical domain -> IP database we have so far. They don't have hugely more data than viewdns.info, but many times do offer something new. It feels like the key difference is that their data goes further back in the critical time period a bit.

TODO do they have historical 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?

E.g. searching thefilmcentre.com under historical data at securitytrails.com/domain/thefilmcentre.com/history/al gives the correct IP 62.22.60.55.

But searching the IP 62.22.60.55 is empty and there's no historical data option?

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.