Need to find the historical data for a site in regards to DNS records after they've already changed? This site was a lifesaver!https://securitytrails.com/
Why would you need it? A service that I was using went down unexpectedly. I'd even anticipated it, as I asked them "How do you make money" and they never responded. But I used it anyway, and my data was stuck after their domain expired. I went there, looked up the domain, and found that their previous IP was still up- it was just that the Domain had expired. I put the domain name in my hosts file with one of the old IPs and was able to get in and retrieve my data. After that, I figured I'd post it here in case anyone else had a need for it in the future.