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Ipregistry is a fast, reliable IP geolocation and threat data API. People use Ipregistry to personalize content, analyze traffic, target ads, block countries but also to prevent abuse by detecting Proxy and Tor users, known spammers and bad bots.
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IPQuery - The Free IP Address API Built By Developers for Developers.
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Fraudlogix provides developer friendly API and code based solutions to detect bots, proxies, VPNs, high-risk users and other forms of fraud.