Score any domain in one second.
Get authority score, referring domain count, popularity rank, and registration data — all from a single domain lookup. Backed by Common Crawl, Tranco rankings, and RDAP.
Need this for 1,000 domains?
The same data is available via the REST API — pay only for what you use, credits never expire.
# Same data, programmatically — first 100 credits free on signup
curl "https://api.rankparse.com/v1/domain-authority?domain=example.com" \
-H "X-API-Key: rp_your_key"About this tool
Domain authority is a relative score that estimates how likely a domain is to rank in search results. The score blends raw link signals (referring domains, total backlinks) with popularity proxies and historical signals like domain age. It's a useful first filter when scoring prospects, vetting guest-post sites, or comparing competitors.
RankParse computes authority scores from the Common Crawl link graph — the same dataset used by independent SEO researchers — and enriches each lookup with the Tranco popularity rank (top 100k) and registration data from RDAP.
How it works
Drop in a domain, hit submit. The tool returns an authority score (0–100), the count of referring domains pointing at the site, total raw backlinks, popularity rank if the domain is in the top 100k, and registration date and registrar. No signup, no credit card.
Free anonymous use is capped at 5 checks/day; a free account bumps that to 25. For programmatic scoring of hundreds or thousands of prospects, the REST API costs 1 credit per call and credits never expire.
Frequently asked questions
- How is your authority score calculated?
- It's derived from the Common Crawl link graph: count and quality of referring domains, factored against the global distribution. Higher scores correlate with more in-bound links from diverse, well-linked sources.
- Is this the same as Moz Domain Authority?
- No. Moz DA is a proprietary score from a different crawler. RankParse's authority score uses Common Crawl. Scores aren't directly comparable across providers — what matters is consistency within one provider for sorting prospects.
- What is Tranco?
- Tranco is an open, research-grade list of the most popular domains globally, refreshed weekly. We display the rank for any domain in the top 100k. Domains outside the top 100k show 'Outside top 100k'.
- What is RDAP?
- RDAP is the modern, machine-readable WHOIS protocol. We fetch the domain registration date and registrar via direct registry endpoints. Privacy-protected domains may show generic registrar data only.