A DA checker is a free SEO utility that calculates the official Moz Domain Authority (DA) score, Page Authority (PA), and Spam Score for any domain on a 0 to 100 logarithmic scale with zero signup required.
Also known as a domain authority checker or Moz DA checker, evaluate your website's ranking strength, check competitors, and inspect backlink authority without email walls.
0 / 100 domains
Zero signup required · Honest Data Rule · Parallel multi-metric analysis
How to Check Domain Authority in 4 Steps
01
Enter a domain
Type or paste any domain or URL into the box above — one per line if you are checking several sites at once.
02
Run the check
Click "Check Domain Authority". OsaniRank reads the domain's live Moz data — no account, no email, no credit card.
03
Read the three scores together
You get Domain Authority (the whole domain), Page Authority (the specific page) and Spam Score (how risky the link profile looks). Never judge a site on DA alone.
04
Compare against your competitors
DA only means something next to the sites you actually compete with in Google. Check your top five rivals and you have your real target.
Real-time In-SERP Authority
Display Moz DA directly on every Google search result
Install the OsaniRank Chrome Extension to see Moz Domain Authority, Ahrefs DR, domain age, and backlink metrics right next to each competitor URL as you search on Google.
Instant SERP overlay with both Moz DA and Ahrefs DR
What is a DA Checker and What Does Moz Domain Authority Measure?
A DA checker (Domain Authority checker) is a specialized SEO tool that evaluates how likely a website is to rank on search engine results pages (SERPs). Domain Authority is a metric developed by Moz scored on a 1 to 100 logarithmic scale.
Unlike simple link count counters, Moz calculates DA using a machine-learning model that evaluates linking root domains, total number of links, MozRank, and MozTrust across millions of Google search engine results.
Comparative Ranking Metric
DA is best used as a comparative metric against your direct organic search competitors, rather than an absolute score in isolation.
Logarithmic Difficulty
Growing your DA from 20 to 30 is significantly easier than moving from 70 to 80 because each tier requires exponentially more authoritative links.
Spam Score Protection
Always evaluate DA alongside Spam Score. A high DA domain with a 50%+ Spam Score usually signals automated private blog networks (PBNs).
Understanding Your DA Score: What the Numbers Mean
Domain Authority runs from 1 to 100, and the scale is logarithmic — climbing from 20 to 30 is far easier than climbing from 70 to 80. Use these bands as a rough map, then judge your score against your niche, not against the whole internet.
DA score
What it usually means
1–20
A new or small website with few links so far. Normal for a site in its first year.
21–40
A growing site that has started earning real links and mentions.
41–60
An established site with a solid backlink profile — the level most healthy businesses sit at.
61–80
A strong authority in its niche; competitors notice this site.
81–100
Elite territory — major publishers and global brands (think of the BBC or Google itself).
There is no single "good DA score". A DA of 35 can dominate a local niche where every rival sits under 25, while a DA of 55 can still trail in a national market full of 70+ sites. The only comparison that matters is you versus the pages ranking for the keywords you want.
What Is Page Authority (PA)?
Page Authority is Moz's score for a single page rather than a whole domain, also on a 1 to 100 logarithmic scale. Where DA predicts how likely the domain is to rank in general, PA predicts the ranking strength of that one URL, based on the links pointing to it.
Use PA when you are comparing individual pages: your product page against a competitor's product page, or one blog post against the post that outranks it. A page with a much higher PA than its rivals is usually the page winning the links in that search result.
What Is Spam Score — and Why It Can Ruin a Good DA
Spam Score is Moz's risk signal: the percentage of sites with similar link characteristics that Moz has seen penalised or banned. It runs from 1% to 100%, in three bands — 1–30% low, 31–60% medium, 61–100% high.
Always read DA and Spam Score as a pair. A domain showing DA 60 with a Spam Score of 70% is not a strong site — it is usually a manipulated one (private blog networks, bought links, hacked placements). If you are vetting a site for a guest post, a partnership or a purchase, a high Spam Score is your reason to walk away, whatever its DA says.
What Affects a Domain Authority Score?
Moz calculates DA with a machine-learning model trained on real search results. The signals that matter most:
Linking root domains — how many different websites link to you. One link each from 50 sites beats 50 links from one site.
The quality of those links — a link from a trusted, high-authority site moves DA far more than a link from an unknown one (Moz tracks this through signals like MozTrust).
Total backlink profile — the overall size and shape of your links compared with every other site on the scale.
Spam signals — the patterns covered by Spam Score can drag a profile down.
DA is always relative: your score can move even when you change nothing, because Moz recalibrates the scale as other sites gain and lose links.
How to Increase Your Domain Authority
There is no setting to switch on — DA rises as your backlink profile genuinely improves:
1
Earn links from new domains. Every first-time linking site counts most. Digital PR, original research, free tools and genuinely useful guides are how sites earn them.
2
Create pages worth linking to. Statistics, calculators, templates and definitive guides attract links long after publication.
3
Win the links your competitors have. Run rival domains through this checker, note where their DA advantage comes from, and target the same kinds of sites.
4
Fix and clean your profile. Remove or disavow clearly toxic links, fix broken pages that hold links, and recover lost links by redirecting old URLs properly.
5
Be patient and consistent. Because the scale is logarithmic, early gains come quickly and later gains take sustained work. Measure monthly, not daily.
DA vs DR vs PA — the Three Scores Side by Side
Domain Authority (DA)
Page Authority (PA)
Domain Rating (DR)
Made by
Moz
Moz
Ahrefs
Measures
Whole domain
One page
Whole domain
Scale
1–100
1–100
0–100
Based on
Link profile, via a machine-learning model
Links to that page
Referring domains, weighted by their own DR
None of the three is a Google ranking factor — Google does not use any of them. They are comparison tools: use DA or DR Checker to size up domains, PA to size up pages, and always compare like with like.
When Should You Check Domain Authority?
Competitor research — benchmark your DA against the sites outranking you before planning content.
Link prospecting — vet guest-post and partnership targets before you pitch (DA up, Spam Score down).
Buying or reviving a domain — check DA, Spam Score and domain age together before paying anything.
Client and stakeholder reporting — one simple number that shows whether a link profile is growing.
