B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
500,000,000
500,000,000 -- referring domain index size for Ahrefs (2026)
Ahrefs has a referring-domain index size of around 500 million as of 2026.
- Approximate figure ('around 500 million')
- Cited from Backlinko's comparison
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
500,000,000
Unit
Count
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Backlinko
Primary
Tier B
https://www.bestseo.sg/blog/competitor-backlink-strategy-2026/ ↗
Source Article
Reverse Engineering a Competitor Backlink Strategy in 2026
Original Research
Backlinko
· Original study ↗
Methodology
Cited from Backlinko tool comparison; index size of crawled referring domains
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Ahrefs: 500,000,000 referring domain index size. Source: Backlinko (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ahrefs-referring-domain-index-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/ahrefs-referring-domain-index-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>500,000,000</strong> -- referring domain index size for Ahrefs<br><small>Source: Backlinko (2026) · <a href="https://lighthousedata.io/data/ahrefs-referring-domain-index-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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