# Why No IPv6?

> whynoipv6.com tracks IPv6 adoption across the top 1 million websites,
> per country, and per curated campaign — and publicly shames the holdouts.
> Every fact on the site comes from a JSON API you can query directly;
> you do not need to render this JavaScript app.

## What the data means

Each domain is checked on several dimensions: the base (apex) domain,
www, nameservers (ns), e-mail (mx), connectivity (conn), and page
resources. Each dimension holds a confirmed status: `supported` (IPv6
works), `unsupported` (no IPv6), `no_record` (no records published),
`not_applicable` (the domain does not use that service — never penalized),
or null (never checked). Domains classify as `hero` (full IPv6),
`partial`, `sinner` (no IPv6), `inactive`, or `unknown`; `saint` marks
exemplary heroes.

## The API (use this instead of scraping)

- [API guide for LLM agents](https://api.whynoipv6.com/llms.txt): start here
- [OpenAPI spec](https://api.whynoipv6.com/openapi.json): every endpoint and schema
- [Interactive docs](https://api.whynoipv6.com/docs): human-browsable reference
- [Bulk datasets](https://api.whynoipv6.com/datasets): daily snapshots, CSV/Parquet, CC-BY-NC-4.0
- [Live check](https://api.whynoipv6.com/docs#tag/check): POST /check runs a fresh scan of any host
- [Badges](https://api.whynoipv6.com/docs#tag/badge): /badge/{host}.svg embeddable IPv6 status badge

## Blog

- [Blog](https://whynoipv6.com/blog): write-ups on the adoption data
- [RSS feed](https://whynoipv6.com/blog/rss.xml): full-content syndication

## Examples

- Domain detail: https://api.whynoipv6.com/domains/example.com
- Top sites without IPv6: https://api.whynoipv6.com/sinners
- Per-country adoption: https://api.whynoipv6.com/countries
- Recent changes: https://api.whynoipv6.com/changelog

Attribution: Data: whynoipv6.com (CC-BY-NC-4.0). Ranks: Tranco.