Hi! We acquired 4 companies that have been doing lots of cool data work. We also license and collect our own data to mix in. There's different granularity depending on the data (WHOIS history, Name Server history, DNS record history, technologies used) etc. We're constantly improving it.
The thesis we have is that if you get hacked, it often times is through an old server or satellite domain. We're building tools to help you find the extended surface area where you can be hacked or have downtime. The example of you finding an old domain is a prefect use case.