How to Investigate Any IP Address Using Free APIs (With Code)

Every developer eventually needs to investigate an IP address. Maybe you're building a security dashboard, debugging a suspicious login, or just curious about who's hitting your server at 3 AM. Most IP investigation tools are either paid, rate-limited to uselessness, or wrapped in annoying UIs. Here's how to build your own investigation tool using free APIs and about 30 lines of code. What We're Building A simple script that takes any IP address and returns: Geolocation — Country, city, coordinates, timezone Network info — ISP, organization, ASN DNS records — Reverse DNS, associated domains Visual proof — Screenshot of any associated website All from the command line. No signup walls. No credit card. Step 1: Get a Free API Key curl -X POST https://api.frostbyte.world/api/keys/create Response: { "key" : "fb_a1b2c3..." , "credits" : 200 , "message" : "Store this key safely" } 200 free credits. That's 200 IP investigations. No email required. Step 2: IP Geolocation Lookup curl -H "x-api-k