Patrick Stox’s Ahrefs study examines link rot phenomenon where links stop pointing to their intended destination because pages are removed, redirected, or altered. Analyzing 2,062,173 websites since January 2013, Ahrefs found that at least 66.5% of links have rotted, with a total of 74.5% considered lost when including temporary errors and SEO-specific exclusions
Why links go missing:
- Dropped pages (47.7%): pages removed from the index or domains no longer exist
- Link removed (34.2%): the page still exists, but the outbound link was deleted or replaced
- Crawl errors (6.45%): temporary issues—excluded from strict “rot” but often real losses
- Redirects (5.99%): the linking page redirects elsewhere, changing or breaking the original path
- Not found (4.11%): the linking page itself was deleted (404)
- Not canonical (0.82%): rel=canonical changed; links effectively moved to a different URL
- Noindex (0.73%): page exists but won’t be counted/passed in search
- Broken redirects: chains that used to work now fail
Implications:
- Link rot is pervasive, especially for larger sites with many live links
- Lost links reduce referral traffic and SEO equity; rotted links break user journeys
What’s recommended:
- Link reclamation: find legacy URLs with inbound links and redirect them to relevant current pages
- Monitoring and auditing: use tools to identify 404s, redirect chains, and dropped pages
- Fix internal broken links and optionally repair external ones for better user experience
- Leverage archives (Internet Archive, Cloudflare Always Online) to surface historical content when pages go down
Bonus solution with The Only Link (aka TOL):
- Smart Routes let you control destinations even after a link is live
- Default Destination acts as an automatic fallback: if no redirect happens, clicks are sent to your website or TOL Profile—so campaigns don’t die on 404s
- This approach reduces lost traffic and preserves intent when upstream links fail
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