There are people and organizations that gather and store historical data on which websites resolved to which IP addresses at what time from where. Sometimes the

There are people and organizations that gather and store historical data on which websites resolved to which IP addresses at what time from where. Sometimes they run a service allowing you to freely query what other websites resolve to which IP addresses, like securitytrails.com does for example, where you can see that pornhub only hosts pornhub websites on its IPs.