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"Riddler.io allows you to search in a high quality dataset with more than 400,326,949 hostnames. Unlike others, we do not rely on simple port scanning techniques - we crawl the web, ensuring an in-depth quality data set you will not find anywhere else."

Spokeo is a search engine specialized in organizing people-related information from phone books, social networks, marketing lists, business sites, and other public sources. Most of this data is publicly available on the Web.  For example, you can find people's name, phone, and address on Whitepages.com, and you can get home values from Zillow.com.  That said, only Spokeo's algorithm can piece together the scattered data into coherent people profiles, giving you the most comprehensive intelligence about anyone you want to find.