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We started implementing the Referring Domains history back in 2013, and thus for all websites, Referring Domains data will show up at that point in time in early 2013 as a sudden spike.&nbsp;

<a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-do-i-see-a-decrease-in-my-referring-pages-graph-despite-an-increase-in-my-referring-domains-graph">Why do I see a decrease in my Referring pages graph despite an increase in my Referring Domains graph?</a>

<a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-is-the-number-of-referring-domains-on-my-dashboard-different-from-the-site-explorer-overview">Why is the number of referring domains on my dashboard different from the Site Explorer Overview?</a>

<a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-does-a-website-have-more-referring-ips-than-referring-domains">Why does a website have more referring IPs than referring domains?</a>

- <a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-do-i-see-a-decrease-in-my-referring-pages-graph-despite-an-increase-in-my-referring-domains-graph">Why do I see a decrease in my Referring pages graph despite an increase in my Referring Domains graph?</a>
- <a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-is-the-number-of-referring-domains-on-my-dashboard-different-from-the-site-explorer-overview">Why is the number of referring domains on my dashboard different from the Site Explorer Overview?</a>
- <a href="https://help.ahrefs.com/site-explorer/faqs-and-troubleshooting/why-does-a-website-have-more-referring-ips-than-referring-domains">Why does a website have more referring IPs than referring domains?</a>

Find out why there is a spike in RDs in 2013.

Why is there a 'spike' in Referring Domains in 2013?

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