Ipinfo

Ipinfo is an IP address data API that gives developers and enterprises fast, accurate information about any IP address. Type in an IP and get back structured data: city, region, country, latitude/longitude, timezone, postal code, ASN, company name, and whether the IP is a VPN, proxy, TOR node, or hosting provider. The API returns JSON in milliseconds, and the data comes from a network of over 1,000 probe nodes that measure the internet in real time.

What makes Ipinfo stand out is its focus on accuracy and speed. The company runs its own Probenet — a global network of measurement nodes that capture infrastructure signals continuously. This means the data reflects how the internet works today, not last month. The API offers 99.99% uptime and typical response times between 50 and 200 milliseconds. You can access the data through REST API endpoints, download flat files in CSV, JSON, MMDB, or Parquet formats, or use official SDKs for popular programming languages. The platform covers geolocation, privacy detection (VPNs, proxies, TOR, relays), ASN lookups, mobile carrier info, WHOIS data, IP ranges, company details, hosted domains, and abuse contact information.

Ipinfo is built for developers who need reliable IP data in production — whether for fraud detection, content localization, analytics enrichment, or network security. Enterprise teams at companies like Google, Microsoft, Cisco, and Anthropic use it. It's also useful for cybersecurity professionals who need to identify anonymous traffic, and for any application that needs to know where users are connecting from. The free tier lets you get started with basic lookups, and paid plans scale to millions of requests per month.