publicsuffix/list resource
The Public Suffix List observed · 2026-08-28
Health v2 · maintenance only
76/100
- Activity 98
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4124
- days_rel: n/a
- days_push: 14
- n_releases_24m: 0
Adoption not part of the score
2921 stars · 1885 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
The Public Suffix List is a community-maintained dataset of all known public internet domain suffixes such as com, co.uk, and pvt.k12.ma.us. It is used by browsers and other software to determine registrable domains, prevent privacy-damaging supercookies, and correctly display domain names.
Use cases
- determine the registrable domain of a url
- prevent cookies being set for public suffixes
- highlight the important part of a domain in a ui
- validate domain ownership for certificate issuance
- parse etld+1 from hostnames
- group browser history by site
When to choose
- you need accurate eTLD+1 extraction across all TLDs
- you are building a browser, cookie jar, or security tool that must respect public suffix boundaries
- you need a widely adopted, community-maintained source of truth for domain suffixes
When to avoid
- you just need a simple regex for common TLDs and can tolerate edge-case errors
- you want to register subdomains on a hosting platform like Cloudflare - the list is not a workaround
- you need a live DNS lookup service rather than a static list
Facets
dataset · maturity active
security networking parser networking security web-development privacy cross-platform public-suffix-list domain-names dns cookies mozilla
2 sources
- readme: https://github.com/publicsuffix/list · fetched 2026-08-28 · 8cfd3c27e4f2
- homepage: https://publicsuffix.org/ · fetched 2026-08-29 · a480e1e462e7
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| publicsuffix/list | main | 76 |
For agents
markdown · JSON · MCP: product_card(name="publicsuffix/list")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem