# Referring domain A referring domain is a unique website that links to yours. You care because ten links from ten sites usually beat ten links from one site. Here is how to measure it and grow it on a small site. Updated 2026-09-13 · Source: https://porteur.ai/glossary/referring-domain ## What a referring domain is and why it matters A referring domain is one distinct website that sends at least one backlink to your site. If blog.example.com and www.example.com link, tools may count them as one or two, depending on subdomain treatment. For a small site, the number of referring domains is a proxy for how many different sites vouch for you. It correlates with your ability to rank across pages, not only the page that got the link. Backlink totals inflate when the same site links many times, for example a footer link. A clean rise in referring domains, from 12 to 25, usually beats a jump in total links from 40 to hundreds from one site. ## How to check referring domains 1. **Google Search Console** Open Links, then Top linking sites. This is your list of referring domains. Click a site to see which of your pages it links to. 2. **Ahrefs** Use Site Explorer. The Overview shows Referring domains and growth over time. Ahrefs is known for its backlink index. Ahrefs Webmaster Tools is free for verified sites. 3. **Semrush** Open Backlink Analytics for your domain. See Referring domains and trend. Semrush reports an Authority Score at the domain level. 4. **Moz** Use Link Explorer. See Referring domains and Domain Authority. Moz also offers the MozBar to inspect pages as you browse. 5. **Cross check** Numbers differ across tools because each has its own crawler. Track direction and trend, not identical counts. > Search Console shows linking sites, but it will not match third party tools. That is normal. Compare shapes of the curves and the actual linking pages. ## What to do with the number Set a simple target: add five new referring domains to your product each quarter. Quality and relevance first. A single good review from an industry publication can beat dozens of random links. - Fix easy wins: recover broken backlinks that point to 404s with a 301 to the right page. - Consolidate: if two thin posts earned weak links, merge them into one useful guide and update linkers. - Create linkable assets: a clear comparison like "/compare/yourtool-vs-legacytool" or original data on your user base. - Pitch contexts that link: integrations pages, docs, galleries, resource roundups, newsletters. - Earn home page coverage: a concise story for a launch post that links to "/pricing" and "/guides/getting-started". Then build internal links from that page to product pages. A fixed page after outreach looks like this: yourproduct.com/guides/getting-started cites the partner, adds a quote, and links back to the partner’s page you pitched, closing the loop. ## Common traps - Chasing raw backlink counts. Ten sidebar links from one site do not equal ten new referring domains. - Buying expired domains to redirect. As of 2026, this is unreliable and can waste time. Build content and relationships instead. - Ignoring subdomains. Some tools count blog.example.com as separate. Be consistent in your tracking. - Forgetting link context. A single followed link in the body of a relevant article is worth more than hundreds of boilerplate links. - Not checking the target. Links to old slugs waste equity. Use a redirect checker to ensure old links resolve to live pages. > Do not rush to disavow. Only consider it if you have a clear pattern of manipulative links and a manual action. Most low quality links can be ignored. ## Questions ### What is a referring domain? A referring domain is a unique website that links to your site at least once. If the same site links 50 times, it still counts as one referring domain. ### How do I check my referring domains? In Google Search Console, open Links and see Top linking sites. In Ahrefs Site Explorer, Semrush Backlink Analytics, or Moz Link Explorer, search your domain and read the Referring domains report. ### Referring domains vs backlinks, which matters more? For growth, the number of distinct sites tends to matter more. It shows breadth of endorsement. Backlink totals can be inflated by repeats from one domain. ### Do subdomains count as separate referring domains? Tools vary. Some treat blog.example.com as separate from www.example.com. Read the tool’s method and track with the same tool over time for consistency. ### Does domain authority affect referring domains? Metrics like Domain Rating, Authority Score and Domain Authority summarise link strength at the domain level. They are tool metrics, not used by Google. Use them to compare prospects, not as goals. ### Can I grow referring domains without big content? Yes. Start with integrations pages, FAQs that cite partners, small original data notes, and comparison pages. Pitch niche newsletters and directories in your space. ## Read next - [Backlink](https://porteur.ai/glossary/backlink): A backlink is a link from another site to yours. See what counts, how to check links, dofollow vs nofollow, and what a small site can expect. - [Domain rating](https://porteur.ai/glossary/domain-rating): Domain rating is a tool’s score of your link profile. See how DR, DA and Authority Score differ, how to check yours, and what to do next. - [How to get backlinks for a small product site](https://porteur.ai/guides/how-to-get-backlinks-for-a-small-site): What to build, who to ask and how to measure. A founder’s plan to earn backlinks without spam or spend, with examples and a checklist. - [Backlink gap: the sites that link to your rivals and not to you](https://porteur.ai/guides/backlink-gap): Find the sites that link to rivals and not to you. Read the page, make the ask, and track new links. A practical backlink gap workflow. - [Broken backlinks: the links you are losing to pages that are gone](https://porteur.ai/guides/broken-backlinks): Links point to deleted pages, wasting authority. Learn how to find broken backlinks, map redirects, when to restore pages, and what not to redirect. - [Ahrefs vs Semrush for a small product site](https://porteur.ai/compare/ahrefs-vs-semrush): Choose Ahrefs if links and Site Explorer matter most, Semrush if you need a broad keyword and marketing suite. Here is how to decide quickly. - [Backlink checker](https://porteur.ai/tools/backlink-checker): Type a domain and see how many sites link to it, how many only with nofollow, the spam score, and the twelve strongest linking domains. Free, no account. Drop your URL into the free check to see which searches and rival pages matter for earning new referring domains, in about thirty seconds, with three findings shown. Free check: https://porteur.ai/