Domain Authority (DA)

Domain Authority (DA) is Moz's 1-100 score predicting how well a domain is likely to rank, computed from its link profile — referring domains, link quality, link patterns — against the rest of the web. Ahrefs' Domain Rating (DR) is the sibling metric most teams use interchangeably. Two facts anchor honest use: the scores are comparative (logarithmic scales where 20→30 is easy and 70→80 is mountainous, meaningful mainly against competitors), and they are third-party proxies — Google has repeatedly said it uses no 'domain authority' metric, whatever the rumor mill insists.

The mechanics explain the limits. Moz and Ahrefs crawl the web, index links, and model what link equity tends to produce in rankings — machine-learned correlation with real SERPs, refreshed as the web and the model change (Moz's DA 2.0 update in 2019 re-scored swaths of the web overnight, a reminder the number is a model's opinion, not a property of the site). The legitimate uses are triage and trend: filtering DIGITAL-PR and LINK-BUILDING prospect lists (a DA-8 directory and a DA-78 newspaper deserve different effort), benchmarking authority growth against competitors over quarters, and sanity-checking a domain's league before content investment — the same job BACKLINK profile review does in detail. The abuses are where the metric earns its bad name: DA as a KPI invites Goodhart's law (the score is gameable with links Google would discount or punish, so chasing it optimizes the proxy and not the ranking); cross-tool comparisons confuse models (DA and DR disagree by design); absolute thresholds ignore category reality (DA 35 leads some niches); and 'guaranteed DA 50+ guest posts' is the spam economy's favorite invoice line. The discipline is proxy posture: use it to sort and trend, verify with real rankings and traffic, and never let a vendor's model become the goal.

DA matters as a working shorthand wherever link sources get triaged at volume — PR prospecting, competitive authority benchmarks, due diligence on domains. It matters most when held lightly: trends against competitors mean something; the absolute number means little; and any strategy that 'targets DA' has confused the speedometer with the road. The discipline is to report it beside the metrics that pay — rankings, organic traffic, referring-domain growth — and to keep the office honest about whose number it is.

Moz introduced Domain Authority in the late 2000s as a PageRank-era proxy for link strength, and rebuilt it as DA 2.0 in 2019 with machine-learned scoring; Ahrefs' Domain Rating became the parallel currency, and both outlived Google's visible PageRank to become the industry's shared — and chronically misread — shorthand for authority.

Etymology: source.

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Areas of marketing where domain authority (da) is a core concern: