WorldIP.io
Map and inspect the entire IPv4 internet
WorldIP.io is a free IP-address intelligence platform that maps the complete IPv4 space: 3.9+ billion addresses across 7.1+ million CIDR ranges, 79,000+ ASNs, and 250 countries. It resolves ownership, geolocation, ASN, and reverse DNS (PTR) for any IP or range, and pairs that with deeper tooling: real-time BGP anomaly detection (MOAS conflicts, RPKI validation, route withdrawals), live RIR ownership-change tracking, WHOIS/RDAP lookups, a subnet calculator with CIDR reference, an IPv4-exhaustion tracker, and a 3D globe that visualizes allocation worldwide. Every lookup and tool works without signup or an API key, and a REST API is available.
Most IP-intelligence sites gate the useful data behind signups, API keys, or paywalls, and few connect geolocation to the routing reality underneath it. It was built to make ownership, ASN, rDNS, and live BGP routing data for the whole IPv4 space instantly queryable and genuinely free.