Referring domains vs. backlinks: which number actually matters

"We have 40,000 backlinks" sounds impressive until you learn 39,000 of them are sitewide footer links from a single template.

One domain, one vote

Search engines heavily discount repeated links from the same source. A link from a domain that has never linked to you before carries far more weight than the 200th link from a domain already linking to you. That is why referring domains — the count of distinct domains linking to you — is the more honest authority signal.

What to monitor

You do not need every link. You need to know when the count of distinct linking domains changes:

• Gained a referring domain → something is working; find what.
• Lost a referring domain → a page was removed, a site went down, or a link was pulled. Worth knowing within days, not months.

Cadence matters more than completeness

A perfectly complete backlink index that you check twice a year is less useful than a referring-domain count you see move week over week. SEOlvl tracks the count and the deltas, and alerts on the changes — so the signal reaches you instead of waiting in a report you never open.