Domain authority is a score that estimates how strong a whole website is, mainly from the links that point to it. Moz created the metric and uses a 1 to 100 scale. Other tools publish similar scores built from their own data.

It looks up a domain and shows scores and link counts that describe its backlink profile. You can use the results to compare websites, spot weak or strong competitors and judge link opportunities.

Yes. You can run checks at no cost. To keep the tool free for everyone, each visitor has an hourly limit and the site has a daily limit.

No. There is no account, email or login. Enter a domain and press the button.

Every provider uses its own formula, but all of them rest on link data: how many sites link to a domain, how trusted those sites are and how natural the pattern looks. The exact formula behind this tool belongs to its data provider.

Moz created Domain Authority. Ahrefs has Domain Rating and other SEO platforms have similar scores, which is why numbers differ from tool to tool.

Common uses are comparing your site with competitors, deciding whether a guest post site is worth your time, checking a domain before buying it and tracking link building progress.

You can check several domains in one go, one per line. The limit is shown above the input box. Each domain is checked separately, so results appear one after another.

Yes. You can look up any public domain. You do not need to own it or verify it.

The data comes from an index that is refreshed over time, not live. Results are also kept for a short period on this site so repeat checks load fast, which means a score can lag behind recent link changes.

They are two names for the same kind of tool. Both estimate how strong a domain is from its links, and both are comparison scores rather than official rankings.

Each tool crawls a different part of the web and calculates its score differently. A site can look a little stronger on one tool and weaker on another. Pick one tool and use it consistently.

No. This tool uses the Crawly open web index, not Moz data, so its numbers will not match a Moz DA checker. It works well for comparing sites with each other, but it should not be quoted as a Moz figure.

It depends on your niche. As a rough guide, under 30 is a young site, 30 to 60 is established and above 60 is strong. The most useful comparison is with the sites that already rank for your keywords.

Lower is better. A score of 20 or below usually looks natural, 21 to 50 deserves a closer look and anything above 50 calls for a careful review of the backlinks.

It is a 0 to 100 estimate of how strong a domain's link profile is, based on the Crawly index. Higher means a stronger profile. Use it to compare sites, not as an official ranking.

Referring domains are the different websites that link to a domain. Ten links from one site count as one referring domain, which is why this number is a better sign of reach than raw link counts.

Total links is the overall number of links found pointing to the domain, including several links from the same site. Read it together with referring domains.

Domain authority describes a whole website, while page authority describes one URL. A strong domain can have weak pages, and a single popular page can outshine its domain.

No. It reports domain level numbers only. For page level figures, use a tool that offers a DA PA checker for individual URLs.

Domain Rating is the Ahrefs metric and domain authority is the Moz metric. Both estimate link strength on a 0 to 100 style scale, but they use different data, so the numbers do not line up.

No. PageRank was a Google algorithm that scored pages by their links. Domain authority is a third party estimate for whole domains. They share the idea that links matter, but they are different things.

Scores near 100 are extremely rare and belong to the biggest sites on the web. On most scales, every point gets harder to earn as you go up.

It is unusual. A new site has had little time to earn links, so its score is normally low. A new site backed by a well known brand or many fresh links can still start higher than average.

No. Google does not use domain authority or any third party authority score as a ranking factor. The score is a stand in that tends to move with things Google does care about, such as the quality of your links.

It is a fast way to compare sites and judge link opportunities. It also gives you a number to track while your link building work pays off over several months.

Not by itself. New sites, small local businesses and tightly focused blogs often have low scores and still rank well for narrow searches. Look at your competitors before deciding whether the number is a problem.

Yes. Scores can fall when you lose backlinks, when linking sites disappear, after a site migration or when the data provider updates its index. A small dip is normal.

Not directly. Traffic and authority often rise together because good content attracts both visitors and links, but the score is built mainly from link data.

Not directly. Older domains often score higher simply because they have had more time to collect links. An old domain with no links gains little from its age.

Internal links do not change a third party score much, but they help search engines find your pages and pass strength from your best linked pages to the rest of your site.

Social links rarely pass authority themselves. They still help, because a widely shared page is more likely to be noticed and linked to by bloggers and publishers.

Links from trusted institutions are valued, but the domain extension alone does not make a link powerful. Relevance and genuine editorial placement matter more.

Not directly. They improve the experience for readers, which makes people more likely to stay, share and link. That can help your link profile over time.

Earn links from relevant, trusted sites by publishing content worth citing. Support that with good internal linking, a clean technical setup and regular updates. There is no shortcut that works safely.

Plan for months. New links need to be found and counted, and the index needs time to refresh. Sites with very low scores often see gains sooner than strong ones.

Yes, especially when the linking site is relevant to your topic. A single link from a respected site in your field can be worth more than many links from unrelated pages.

No. Links from spammy directories, link farms and unrelated pages can do nothing or even raise your spam score. A natural mix of relevant links is the goal.

Paid links that pass authority go against Google's guidelines and can lead to penalties. Paying for real advertising or sponsorship is different, as long as the links are marked correctly.

Review the sites that link to you and look for pages with no real content, hidden text, foreign language spam or exact match anchors repeated again and again. A backlink report from Google Search Console is a good starting point.

Only as a last resort. Try to get clearly manipulative links removed first. Google says most sites do not need the disavow tool, so use it carefully and only for links you can prove are harmful.

Indirectly, and strongly. Useful, original content is what earns natural links, and natural links are what raise the score.

It depends on the provider. Some treat subdomains as part of the root domain and others score them separately. Check both versions if you use subdomains heavily.

Slowly, if at all. You can fix broken links, reclaim unlinked mentions and improve internal linking, but meaningful growth almost always needs new links from other sites.

Spam score estimates how closely a site's link profile resembles the profiles of low quality or manipulative sites. It is a 0 to 100 number, and lower is better.

No. Google does not use this score. A high number is a prompt to look at your backlinks, not proof of a penalty.

Audit your backlinks, ask webmasters to remove clearly paid or spammy links and stop building links from low quality sources. Earn new links from relevant sites to improve the overall mix.

Yes, as one filter. Combine the authority score and spam score with checks on real traffic, topic fit and the quality of the content the site publishes.

Yes. Look at the authority score, spam score and number of referring domains. A good score can still hide a past penalty or poor content, so review the backlinks and history as well.

It is a helpful first look at how well linked a site is. For advertising, also check real audience size, location and relevance.

To keep the tool free, each visitor can run a limited number of fresh checks per hour and the site has a daily limit. Domains checked recently load from cache and do not count towards the limit.

It means the domain was checked recently and the saved result was shown instead of calling the data provider again. This keeps the tool fast and free.

New or small sites may not have many links in the index yet. If you have just launched, give it time, keep earning links and check again in a few weeks.

Yes. Use the Copy table button under the results and paste into Google Sheets or Excel.

It keeps recent results for a short time so repeat checks are fast. It does not ask for your name or email.

Once a month is enough for most sites. Checking daily mostly shows noise. Compare the same sites with the same tool and look at the trend.