How do some tools give Personally Identifiable Information like for ex – Company names of website visitors going on a specific website? They claim to so it with reverse IP lookup.
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Visit https://whatismyipaddress.com/ and click on the digital IP address. The hostname shown is the result of the reverse IP lookup. The IP address owner voluntarily publishes the hostname associated with the IP address. [For example 8.8.8.8 IP address](https://whatismyipaddress.com/ip/8.8.8.8) has “dns.google” hostname. Some other Google’s IP address may have a hostname like 38404.corp.google.com. If that IP address is used as an intermediate node for Google employees visiting some websites, the reverse IP lookup reveals the company of the visitor.
It is not as useful as the tools make you believe. The vast majority of IP addresses have either no hostname or the hostname reflects an ISP name such as <some-digits-and-numbers>.<your-ISP>.<domain>
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