Domain Rating (Ahrefs' metric) and Domain Authority (Moz's equivalent) are both third-party scores designed to estimate the strength of a site's backlink profile on a rough 0-100, logarithmic scale. Neither is a Google ranking factor — Google has never used either metric, and both companies that publish them describe them as an estimate for comparing sites, not a measurement Google itself produces. That distinction matters more than it sounds, because "check the DR" has become shorthand for "check if a link is good," when it was only ever meant to estimate one input among many.
Why DR and real traffic can diverge
A domain's backlink profile and its current organic performance can move independently of each other. A few common patterns explain most of the gap:
- Expired domain flips — a domain that built genuine authority in one niche years ago, expired, and was bought specifically to resell links in an unrelated niche. The backlink history (and DR) persists; the actual current relevance and traffic don't.
- Penalized or decayed sites — a site that lost significant rankings due to a manual action or algorithm update can retain a high DR for a period, because DR reflects the existing backlink profile more than current search performance.
- Link-farm patterns — some sites accumulate backlinks specifically to inflate DR for resale purposes, without ever building a real audience or ranking footprint to match.
Because DR is logarithmic, the gap in real authority between DR 20 and DR 21 is far smaller than between DR 74 and DR 75 — small differences near the top of the scale represent much bigger real gaps than the same numeric difference lower down. Treating DR as a linear "bigger number always better" scale misreads what it's actually showing.
A worked comparison
| Site A | Site B | |
|---|---|---|
| Domain Rating | 62 | 28 |
| Estimated organic traffic | Near zero, declining | Real, steady, on-topic |
| Topical relevance | Unrelated niche (former travel blog) | Directly relevant to your industry |
| Likely value as a placement | Low, despite the higher score | Meaningfully higher, despite the lower score |
Site A is the pattern to watch for: an attractive headline number attached to a site that no longer functions as a real, trusted publication in any topical sense. Site B is a more defensible placement precisely because the underlying signals — real traffic, real relevance — hold up, even though the score alone looks less impressive on a report.
How this fits into a full vetting process
DR and traffic checks are two inputs among the ten covered in the main link building guide's publisher qualification framework — not a replacement for the rest of it. A site can pass the DR-and-traffic check and still fail on editorial quality, site history, or audience fit. Treat this as the first filter, not the only one.