B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
67%
67% -- hreflang issue rate for domains studied by Max Prin and Ahrefs (2025)
67% of nearly 375,000 studied domains had hreflang issues.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
67%
Unit
Percentage
Data Vintage
2025
Entity
Sample Size
375,000
Geography
Global
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
Ahrefs / Max Prin
Primary
Tier B
https://expertseoconsulting.com/international-seo-at-scale-max-prin-on-hreflang-syndication-and-doma… ↗
Source Article
International SEO at Scale: Max Prin on Hreflang, Syndication, and Domain Strategy
Max Prin from Condé Nast closed Tech SEO Connect with a refreshing admission: “I’m not going to talk about AI or LLMs or AEO or GEO. Well, we’ll talk about GEO, but not that GEO.” His topic was international SEO—a discipline where nothing fundamental has changed in 14 years, but the execution at sca…
Original Research
Ahrefs / Max Prin
· Original study ↗
Methodology
Study run by Max Prin (Condé Nast) with Ahrefs across ~375,000 domains
Methodology documented
Segmentation
IndustryMedia
RegionGlobal
RoleSEO Specialist
Channelsearch
Cite this stat
Plain Text
domains studied by Max Prin and Ahrefs: 67% hreflang issue rate. Source: Ahrefs / Max Prin (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/hreflang-issues-domain-study
HTML Embed
<blockquote cite="https://lighthousedata.io/data/hreflang-issues-domain-study" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>67%</strong> -- hreflang issue rate for domains studied by Max Prin and Ahrefs<br><small>Source: Ahrefs / Max Prin (2025) · <a href="https://lighthousedata.io/data/hreflang-issues-domain-study" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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