Question 1

What is Domain Authority (DA)?

Accepted Answer

Domain Authority (DA) is a metric developed by Moz that predicts how likely a domain is to rank in search engine results pages. It is scored on a logarithmic scale from 1 to 100 — higher scores indicate stronger ranking potential. DA is calculated using machine learning models trained on real search results, weighing factors including unique referring domains, total backlinks, quality of linking domains, link diversity, and spam signals. It is important to note that DA is not a Google ranking factor — Google does not use Moz's DA score. It is a comparative benchmark tool used by SEO professionals to assess site authority relative to competitors.

Question 2

Is Domain Authority a Google ranking factor?

Accepted Answer

No. Domain Authority is a metric created by Moz — a third-party SEO software company. Google does not use DA in its ranking algorithm and has never referenced it as a ranking signal. Google has its own internal quality signals that are not publicly disclosed. DA is useful as a relative comparison tool between competing sites, but a high DA score does not guarantee rankings and a low DA score does not mean Google ignores your site.

Question 3

What is a good Domain Authority score?

Accepted Answer

Domain Authority is most meaningful when compared against your direct competitors rather than as an absolute number. General benchmarks: a brand new site (0–6 months old) typically scores DA 1–15. A small blog or local business site with 1–2 years of history usually sits at DA 15–30. An established site with 2–5 years of consistent link building typically reaches DA 30–50. Major brand websites typically score DA 50–70. Internet giants like Wikipedia, Amazon, and major news outlets score DA 80–99. The most useful question is not whether 42 is good, but whether your DA is higher or lower than your top three competitors targeting the same keywords.

Question 4

What is the difference between Domain Authority and Page Authority?

Accepted Answer

Domain Authority (DA) measures the overall ranking strength of an entire domain or subdomain. Page Authority (PA) measures the ranking strength of a single specific page. Both use the same 1–100 Moz logarithmic scale. DA is most useful for evaluating the overall strength of a website and comparing it against competing domains. PA is more useful when evaluating whether a specific page is likely to rank for a target keyword. For most SEO purposes, DA is the headline metric, but PA matters more when assessing individual landing pages or blog posts.

Question 5

What is spam score and what is a healthy level?

Accepted Answer

Spam score is a Moz metric that indicates the percentage of a site's backlinks that come from domains flagged as spammy or low quality. A spam score below 3% is considered healthy and normal. A score between 3–10% warrants monitoring. A score above 10% is a red flag — investigate your backlink profile using a backlink checker and consider disavowing toxic links through Google Search Console. High spam scores can come from link schemes, purchased links, private blog networks (PBNs), or scraped content sites linking to you.

Question 6

Why did my Domain Authority score drop?

Accepted Answer

DA drops are most commonly caused by Moz index recalculations rather than anything you did wrong. Moz periodically updates its link index and machine learning models, which can cause DA scores to shift across millions of domains simultaneously. Small fluctuations of 1–5 points are completely normal and not a cause for concern. Other causes include competitor sites growing their link profiles faster than yours (making your relative score drop), loss of high-quality backlinks that previously boosted your score, or an increase in spam score from newly acquired toxic links. A DA drop does not indicate a Google penalty.

Question 7

How is Domain Authority calculated?

Accepted Answer

Moz calculates Domain Authority using a machine learning model trained on search engine result data. The heaviest-weighted factor is the number and quality of unique referring domains — sites that link to your domain from a unique domain. Authority also flows from the DA of linking sites: a single link from a DA 80 site contributes more than 50 links from DA 5 sites. The scale is logarithmic, meaning it is significantly easier to move from DA 20 to DA 30 than from DA 70 to DA 80. Link decay — old or removed backlinks — also factors in over time.

Question 8

How do I improve my Domain Authority score?

Accepted Answer

The most effective way to increase Domain Authority is building high-quality backlinks from authoritative, relevant domains. Proven tactics include guest posting on established sites in your niche, creating original research or data studies that attract natural links, building resource page links, and broken link building — finding dead links on relevant sites and suggesting your content as a replacement. One link from a DA 60+ domain contributes more to your DA than 50 links from DA 5 sites. Also clean up toxic backlinks — use a backlink checker to identify spam links and disavow them through Google Search Console to reduce your spam score.

Question 9

Can I check my competitor's Domain Authority?

Accepted Answer

Yes. Enter any domain into this free Domain Authority checker and get its DA, PA, spam score, total backlinks, and referring domains. Competitor DA comparison is one of the most practical uses of this tool — if you are targeting the same keywords as a competitor with DA 55 and your site is at DA 20, you know exactly how much of a gap you need to close through link building before competing for top rankings on those terms.

Question 10

What is the difference between Moz Domain Authority and Ahrefs Domain Rating?

Accepted Answer

Both Moz Domain Authority (DA) and Ahrefs Domain Rating (DR) measure a website's backlink strength on a 1–100 scale, but they use different algorithms, different link indexes, and different machine learning models. Scores for the same domain typically differ by 5–15 points between the two tools. Neither is more correct — they are different proprietary interpretations of backlink data. Moz DA is older and more widely referenced in the SEO industry. Ahrefs DR is generally considered to reflect a larger and more frequently updated link index. Use either tool consistently for tracking — comparing your Moz DA against a competitor's Ahrefs DR gives misleading results.

Question 11

How often should I check my Domain Authority?

Accepted Answer

Monthly is sufficient for most sites. Domain Authority moves slowly — it is not a metric that changes week to week based on your actions. Check it at the start of each month, compare against the same competitors you tracked last month, and log the results over time to see your trajectory. If you are running an active link building campaign, checking every two weeks can help you spot the impact of new links or lost links more quickly.

Question 12

Can I pay someone to increase my Domain Authority?

Accepted Answer

No legitimate service can directly increase your DA. Any offer to 'boost your DA to 50 in 30 days' is either a scam or involves selling you toxic backlinks from private blog networks (PBNs) or link farms — which can actually harm your site by raising your spam score and attracting a Google manual penalty. DA is an outcome of genuine, high-quality link acquisition over time. The only reliable path is earning or building real backlinks from authoritative, relevant websites.

Question 13

What is the highest possible Domain Authority score?

Accepted Answer

The theoretical maximum is DA 100, but no site actually achieves a perfect score. The highest DA sites in the world include Wikipedia (approximately DA 93–95), Google.com, YouTube, Facebook, and major news outlets like BBC and The New York Times, which typically score DA 90–99. For most websites, reaching DA 50–60 represents strong authority in most niches, and DA 70+ puts you among the most authoritative sites in any industry.

Free Domain Authority Checker — Check DA Score Online

What Is Domain Authority?

What DA measures

How Is DA Calculated?

Moz machine learning

Logarithmic scale

What Is a Good DA Score?

Benchmarks

Compare vs competitors

Common Misconceptions

How to Improve Your Domain Authority

Build quality backlinks

Remove toxic links

Frequently Asked Questions

Know Your Authority. Then Improve It.