Open Authority Rating
fsf.org
55/100
- Harmonic centrality rank
- #4,646
- PageRank rank
- #3,351
- Crawled hosts
- 71
- Crawl release
- cc-main-2026-jun-jul-aug
- Last computed
- Aug 31, 2026
Stronger than 99.99% of the 119,722,885 ranked domains (by harmonic centrality).
About this domain
- Registered
- Feb 1, 1991
- Registrar
- Gandi SAS
- Registration expires
- Feb 2, 2027
- Hosting country
- US
- Hosting provider
- FREEASINFREEDOM
- IPv6
- yes (AAAA)
- Email (MX)
- yes
- Nameservers
- ns1.gnu.org, ns4.gnu.org, ns2.gnu.org
- TLS certificate
- Let's Encrypt
- Certificate valid until
- Oct 9, 2026
- Homepage
- HTTP 200 after 1 redirect
- Page title
- Front Page — Free Software Foundation — working together for free software
- Declared language
- en
Sources & freshness
- Registration: via rdap:rdap.publicinterestregistry.org, fetched Aug 30, 2026
- DNS: via doh, fetched Aug 30, 2026
- Hosting (IP→ASN): via iptoasn.com, fetched Aug 30, 2026
- TLS: via tls-handshake, fetched Aug 30, 2026
- Homepage: via homepage-fetch, fetched Aug 30, 2026
Facts we can’t prove are shown as unavailable — never estimated. Data refreshes roughly monthly.
OAR across crawl releases
| Crawl release | OAR |
|---|---|
| cc-main-2026-apr-may-jun | 55 |
| cc-main-2026-may-jun-jul | 55 |
| cc-main-2026-jun-jul-aug | 55 |
Dashed marks are crawl releases where fsf.org wasn’t in the link graph; gaps are shown honestly, never interpolated.