IPKit
Free "what is my IP" and IP lookup API: IPv4/IPv6, geolocation, ASN, ISP and VPN/proxy/Tor signals as JSON via curl.
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CPFHub.io CPF API
REST API for Brazilian CPF lookups: name, gender and birth date in about 150 ms, plus real-time Receita Federal registration status.
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IPStack API
Free IP geolocation lookup API.
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