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WHOIS data is the most crucial data source for ipapi.is, as it allows the derivation of the organization that owns a specific IP address. Additionally, WHOIS records can be used to derive useful metadata such as domain names, email addresses, and geolocation intelligence.

In this blog post, we describe in depth how the IP ranges of a substantial part of the hosting providers on the Internet can be detected. Knowing whether an IP address belongs to a hosting provider or not helps in making better IT security decisions.