About
What This Is
This is a free IP geolocation API. You send it a request, it sends back everything it knows about the IP. Country, city, coordinates, ISP, ASN, VPN detection. All of it. JSON. No API key. No signup form.
The API has seven endpoints:
/api/mereturns your own IP with full geolocation/api/ip-lookuplooks up any IP you specify/api/whoisgives you WHOIS/RDAP data for domains and IPs/api/blacklistchecks 15 DNSBLs for spam listings/api/port-scantests if a TCP port is open/api/ssl-checkverifies SSL certificate details/api/http-headersechoes back your HTTP request headers
That’s the whole product. Seven endpoints that do useful things, and none of them ask for your email first.
Why It Exists
Most IP geolocation APIs want your email before you can make a single request. Then they give you 100 free lookups per month. Then they send you emails about their “pro tier” for the next six months.
We didn’t want that. We wanted an API that works the way APIs should work. You make a request. You get data back. End of story.
The API started as an internal tool. We needed IP data for other projects, got tired of paying for it, and built our own. Then we figured other people probably felt the same way, so we made it public.
The Ecosystem
whatismyip.technology is the main site. Fifteen free browser tools. Every tool calls these same API endpoints.
whatismyip.codes is what you’re reading. The developer docs.
whatismyip.wiki is the knowledge base. Forty eight articles about networking, written in plain English.
All three sites are free. No ads. No paywalls.
How It Works
The API runs on edge functions via Vercel. Your request comes in, the function reads the IP, looks it up in memory, builds a JSON response, and sends it back in milliseconds. Nothing gets logged or stored.
CORS headers are set to * on every response, so you can call the API from browser JavaScript on any domain.
The Philosophy
No API keys. No signup. No OAuth. Just make the request.
JSON only. No XML. No YAML. It’s 2026. JSON won.
HTTPS only. HTTP requests get rejected.
Free means free. No “free tier” that’s actually a trial. No upgrade button.
Outline Technologies SINCE 2015
An SEO, AEO, and GEO agency that builds brand visibility across Google, ChatGPT, Perplexity, Claude, and Gemini. whatismyip.codes is one of 15+ tools built and grown in house.