Domain metrics help you decide where to investigate. They summarise parts of a backlink profile or estimate aspects of a website’s visibility, making a large list easier to sort. They do not establish that a domain is trustworthy, valuable or certain to rank.
The useful habit is to ask what a metric measures, which data provider produced it and what evidence sits underneath it. A score without that context can turn a convenient filter into an expensive assumption.
Distinguish scores from observed results
Authority scores are models created by SEO data providers. Backlink counts describe what a provider’s crawler has found. Traffic estimates model visits from available inputs. Your own analytics and Search Console provide a different kind of evidence about a website you control.
Those categories should have separate columns in a research sheet. If a seller says a domain has traffic, ask whether that means observed visits, an SEO tool’s estimate or simply an expectation based on its links. Each supports a different level of confidence.
Know the main authority metrics
| Metric | Provider | What to keep in mind |
|---|---|---|
| Domain Authority and Page Authority | Moz | Domain-level and page-level scores should be recorded separately. |
| Domain Rating | Ahrefs | A relative assessment of backlink-profile strength. |
| Trust Flow | Majestic | A link-based score built around relationships to trusted seed sites. |
| Citation Flow | Majestic | An assessment of link influence; it is not simply a raw backlink count. |
Ahrefs explains Domain Rating as a relative backlink metric and states that it does not incorporate traffic, domain age or link spam. A high DR therefore does not answer those questions for you.
Majestic’s glossary defines Trust Flow and Citation Flow and explains that links have differing weights. Do not turn the relationship between the two scores into a universal pass-or-fail rule. A striking difference is a prompt to inspect the links and their context.
Moz’s DA and PA are also third-party research signals. Keep the exact measurement target visible: the root domain, a subdomain and an individual URL can tell different stories. Scores from different providers are not interchangeable simply because they appear on similar numerical scales.
Inspect what produces the score
Start with referring domains rather than celebrating a large backlink total. Many links from one site can create a high count without providing a diverse profile. Review the strongest-looking sources and a sample of ordinary ones.
- Does the linking page still exist and contain the link?
- Is the surrounding content relevant to the old website and your intended project?
- Does the anchor text make sense, or is it dominated by unrelated commercial terms?
- Are important links directed to pages that no longer exist?
- Does the profile rely heavily on redirects, sitewide placements or sources that appear artificial?
These checks are more informative than setting a single minimum score. A modest profile with a clear topic and useful editorial references may deserve further study. A larger score with unexplained links may deserve rejection.
Keep comparisons consistent
Record the provider, lookup date, target scope and index selection where offered. Compare results from the same system and similar targets. If a score changes, check whether the provider’s data changed before concluding that the website itself improved or deteriorated.
For example, a hypothetical research sheet might show a stable referring-domain count but fewer currently live links after manual review. That distinction matters more to a purchase than an unchanged headline authority score. Preserve the source-page URLs so you can repeat the checks.
Apply extra checks to expired domains
Inspect archived use, previous topic changes and any evidence of spam or impersonation. Then check the actual acquisition route through the registrar or auction venue. Metrics are neither a registration-availability check nor a valuation of the name’s wording.
Google’s expired-domain abuse policy addresses repurposing expired domains primarily to manipulate rankings with content that provides little or no user value. A strong-looking backlink profile does not make such a plan dependable.
Our starting guide connects research with practical due diligence. For buying decisions, use the domain appraisal workflow alongside link checks. For ongoing SEO research, the backlink analysis guide explores how to investigate competitors. Let metrics select the next question, then use the underlying evidence to answer it.