Free referring-domains check
How many websites are actually pointing at yours?
See distinct referring domains, movement between graph releases, strong sources and the authority signals Lumina builds from them.
Why referring-domain breadth matters
Ten links from one website and ten links from ten different websites are not the same link profile. Lumina keeps referring-domain breadth separate so repeated links from one source cannot masquerade as ten independent endorsements.
Breadth
How many distinct domains in the open graph point at the website.
Movement
How the distinct-domain set changes between available graph releases and saved Lumina snapshots.
Context
Which sampled referring domains themselves have stronger graph positions, and which patterns deserve review.
Common Crawl is a sample of the open web. Counts can differ from commercial backlink indexes because crawlers see different pages at different times. Lumina uses the graph consistently so its own history remains comparable.