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CGNAT.wtf open data: ISP CGNAT, static IP and IPv6 dataset (JSON)
Everything on this site is built from static JSON files you can read directly: 41 US home ISPs with CGNAT defaults, public IPv4 opt-outs, static IP options and prices, IPv6, upload, inbound ports 25/80/443 and the terms on servers, each with its sources. No key, no sign-up.
| File | What's in it | Shape |
|---|---|---|
/data/isps.json | Every ISP and every field: value, note, sources (URL + source type), quote, last-checked date, CGNAT confidence, ASNs, states served. | Object: generated, count, isps[] |
/data/selfhost.json | Yes / maybe / no / unknown per ISP and use (website, mail, game, media, remote desktop, cameras, files, voice/video), with the reasons and sources. | Object: uses, verdicts, isps |
/data/hostreport.json | Compact per-ISP row behind the checker's report: CGNAT default, opt-out, static IP and price, IPv6, server terms, public-IP guide. | Object keyed by ISP slug |
/data/asn.json | ISP slug to network numbers (ASNs) and organization-name fallbacks, checked against public network registry records. The checker uses it to name your ISP. | Array of {slug, name, asn[], names[]} |
/data/states.json | US state code to its state page (only states with a page). | Object keyed by state code |
/changes/feed.xml | Dated, cited ISP policy changes and our own data updates. | Atom feed |
How to use it
- Plain HTTPS GET. Files are served with
Access-Control-Allow-Origin: *, so a browser page on another site can read them. - They're cached at the edge for up to 30 minutes and rebuilt whenever the data changes. Each value in
isps.jsonhas acheckeddate;generatedis the build date. - "unknown" means not verified yet, not "no". Customer-report values carry the source type
communityand a low CGNAT confidence. - Follow the changes feed to hear when an ISP's rules change.
- Agents and LLM tools: /llms.txt summarizes the site and lists these files.
Example
Fetch https://cgnat.wtf/data/isps.json, find the ISP by slug in isps, and read a field such as cgnat:
{"slug": "cox", "cgnat": {"v": "some", "conf": "low", "note": "...", "src": [{"url": "https://...", "kind": "community"}], "checked": "2026-10-16"}, ...}Linking and reuse
You're welcome to link to these files and to the ISP pages, and to quote individual facts with a link back to the ISP's page on cgnat.wtf. An open license for bulk reuse hasn't been chosen yet; until then the dataset is all rights reserved. Found a mistake? Submit a correction.