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Quick answer: Domain authority is a third-party score, created by Moz, that estimates how strong a website’s link profile is compared with other sites. It is a useful filter for spotting weak or spammy sites, but it moves for reasons outside your control and is easy to inflate, so never buy links or SEO work sold on the score itself.
If you run a Singapore business and have ever received an SEO proposal, a guest post offer or a cold email about “high authority links”, you have probably met domain authority. It turns up as a promise (“we will take your DA from 12 to 40”), as a price tag (“DA 50 guest posts from S$80”), and occasionally as a reason to panic (“your DA dropped three points this month”). Very few of those messages explain what the number is, who calculates it, or why it changes.
This piece is not about how to check your score or how to improve it step by step. It is about the moments when the number is used to sell you something: agency proposals, link marketplaces, expired domains and monthly reports. If you want the wider picture of what search work involves beyond links, our SEO services overview sets out the main pieces.
Our conclusion is simple. Domain authority is a good screening filter and a bad sales promise. Use it to rule out weak or spammy sites quickly. Treat any proposal that sells the score itself as the outcome as a red flag, and judge link and agency offers on relevance and real traffic instead.
Domain Authority (DA) is a score from 1 to 100 published by Moz, an SEO software company. It estimates how likely a whole website is to rank in search results compared with other websites. The main ingredient is backlinks, which are links from other websites pointing to yours, and in particular linking root domains, which counts how many separate websites link to you rather than how many individual links exist. Moz feeds this link data into a machine-learning model and turns the result into a single number.
Three facts about the score matter more than the number itself:
Used properly, that makes the score a reasonable first filter. If you are deciding whether a directory, a news site or a potential partner is worth a closer look, a very low score combined with no visible traffic tells you something. A sensible score does not prove a site is good, but a site with almost no links and no visitors is unlikely to send you either.
The trouble starts when the filter becomes the goal. Because the number is simple, public and easy to screenshot, it has become a sales currency. And anything used as currency attracts people who print their own.
One of the most common worried messages an owner sends is some version of “our DA dropped and nobody touched the site.” Moz’s own support answers on its Q&A forum explain why this happens, and none of the reasons involve anything you did.
The vendor’s index changes. Moz’s crawler does not visit every website on every crawl. From one update to the next it may find links it missed before, or fail to re-find links it counted last time. Your actual link profile may be identical while the set of links Moz has on record is different. Each other tool has the same issue with its own crawler, which is also why the scores between tools never quite agree.
The scale is relative. Moz has explained that because the top of the scale is defined by the most heavily linked sites on the web, when those giants gain links, the whole scale effectively stretches. Your site can earn genuine new links and still see its score hold flat or dip, simply because the benchmark moved faster than you did.
Competitors and the wider web keep growing. The same logic applies closer to home. If sites similar to yours are earning links faster than you are, your relative position slips even though nothing on your site has changed.
The model itself gets rebuilt. Moz has updated its Domain Authority model in the past, most notably with Domain Authority 2.0 in 2019, and model changes shift scores across large parts of the web at once.
Moz’s forum answers also note that smaller scores swing more. A site in the low 20s will see more visible movement from update to update than a site in the 40s. For most Singapore SMEs, whose scores sit in that lower range, a few points up or down in a month is normal noise.
In our experience, the owners who check their score most often are the ones most likely to be sold something on the back of a dip. A drop is not an emergency and a rise is not a result. Look at the trend over several months in one tool, alongside your enquiries and rankings, and treat anything shorter as weather.
If the score were only ever used as a rough filter, nobody would bother gaming it. But once link sellers started pricing placements by DA, there was a strong financial reason to manufacture high scores.
A link farm is a group of websites created mainly to link to each other or to sell links, rather than to serve readers. A private blog network (PBN) is a similar idea: a set of sites, often built on old domains, controlled by one operator and used to pass links. Both can produce sites with impressive-looking scores, because the scoring models count links, and links can be manufactured.
Common ways scores get inflated include:
Link marketplaces, websites that list publishers and let you buy a placed article, usually let you filter and sort by DA or DR. That makes sense as a buyer convenience, but it also means sellers compete on the number buyers sort by. A listing with a high score and a low price is often a listing where the score is the product.
Google’s spam policies treat buying or selling links that pass ranking credit as link spam, and Google says it can ignore such links or take action against sites involved. That is the real risk: you may pay for a placement whose score looked strong, and get either nothing or a problem.
When we audited sites that had bought placements this way, the pattern was usually the same: a long list of articles on sites that covered every topic from crypto to cosmetics, with no Singapore readers, no visible traffic and no reason for a customer to ever see them. The scores on the invoice looked fine. The links did nothing a customer could notice.
A more elaborate version of the same idea is buying a domain that already has a high score. You may be offered an expired domain, one whose previous owner let the registration lapse, or an aged domain, one that has been registered for many years. The pitch is that you inherit its authority, either by building your site on it or by redirecting it to your own site. A redirect, usually a 301 redirect, is an instruction that sends visitors and search engines from one address to another.
There are a few problems with this.
The links were earned by someone else, for something else. If the old domain belonged to a travel blog, its links point to travel content. Redirecting it to a renovation business or a law firm creates a mismatch that search engines can see. Relevance does not transfer just because the score does.
Google has a specific policy about this. Google’s spam policies include expired domain abuse, where an expired domain is bought and repurposed mainly to manipulate search rankings by hosting content that has little to do with what the site used to be. Google treats that as spam.
The score may already be manufactured. Expired domains are a favourite raw material for link farms, and some are sold after a burst of artificial links has been pointed at them. You cannot tell from the number alone.
History comes with it. An old domain can carry a past you would rather not own: previous spam, past penalties, or content from a business that no longer exists still being linked to in ways that make no sense for yours.
There are legitimate reasons to buy an older domain, for example when you acquire a competitor’s business and fold its website into yours, or when you buy back a name that matches your brand. In those cases the content and the customers are genuinely related. The test is simple: would you buy this domain if it had no score at all? If the answer is no, the score is what you are paying for, and that is the part least likely to help.
If you are planning a site move or a merger of two websites, the redirect work is a genuine technical job. Our technical SEO service page explains how site structure, redirects and indexing are handled.
Domain authority appears in agency proposals in three main ways: as a target, as a deliverable and as a reporting metric. Each deserves a different reaction.
As a target. “We will increase your DA from 12 to 35 in six months.” This is the version most worth questioning. The agency does not control Moz’s index, its model or the growth of every other site on the web. The fastest way to hit a number like this is to buy or build the kind of links described above. Ask what work will be done, and what business result it is meant to produce.
As a deliverable. “Twenty DA 40+ backlinks per month.” This prices the work by a third-party score rather than by where the links come from. Ask for sample sites, and check them yourself against the questions later in this piece.
As a reporting metric. “Your DA rose from 9 to 14 this quarter.” This is the most harmless use, as long as it sits alongside organic traffic, rankings for searches that matter and enquiries. It becomes a problem only when the score is the headline and the other numbers are missing.
Most agencies will tell you a rising DA proves their link building is working. That frequently backfires as an argument, because the score can rise from low-quality links that send no visitors, and it can rise or fall when the agency did nothing. A report that leads with DA is often a report without much else to show. We would rather see an agency report enquiries first and mention the authority score in passing, if at all.
In our experience, the most useful proposals describe the work in plain terms: which pages will be built or improved, which technical problems will be fixed, how local visibility will be handled, and what kinds of sites might reasonably link to you and why. If you want to see how ongoing SEO work is commonly structured before you compare quotes, our pricing page is public.
For owners without an in-house marketer, the small business SEO page explains how support is usually scoped so the work matches the size of the business.
The table below translates the most common DA claims into what they usually mean in practice, and the question that gets you closer to a useful answer.
| Claim you hear | What it really means | What to ask |
|---|---|---|
| “We’ll raise your DA to 40” | The agency is promising a third-party number it does not control, usually by acquiring links in bulk | Which pages, fixes and link sources are in the plan, and what enquiry or ranking change is expected? |
| “DA 50 guest posts from a low price” | Placements on sites whose score is high relative to the price, often because the score has been inflated | Can I see the sites, their real organic traffic and whether they are relevant to my industry or Singapore? |
| “This expired domain has DA 45, redirect it to your site” | You are paying for someone else’s old links, which may be unrelated or manufactured | What was this domain before, and would I want it if it had no score? |
| “Your DA dropped, you need a link package” | The score moved, probably from an index or scale change rather than anything on your site | Did organic traffic, rankings or enquiries drop too? |
| “Our network sites are all DA 30+” | A group of sites controlled by one operator, likely a PBN | Who owns these sites, who reads them, and are they indexed by Google? |
| “Your DA went up 5 points this month” | A score moved; it may or may not reflect real progress | What happened to organic visitors and enquiries in the same period? |
| “High DA means Google trusts you” | A misunderstanding: Google does not use Moz’s score | Show me the searches we rank for and the traffic they bring |
Notice that every question in the last column points away from the score and towards something you can check: the sites themselves, the traffic, Google’s index and your own enquiries. The score summarises link data seen by one tool; the questions get you the underlying facts.
You do not need specialist software to ask any of these. A seller who cannot or will not answer them has told you what you need to know.
If DA is only a filter, what should you actually judge an offer on? Four things, roughly in this order.
1. Relevance. Is the linking site about something your customers care about, or something connected to your industry or Singapore? A link from a Singapore home and living site to a renovation contractor makes sense. A link from a general “business tips” site that also publishes casino and supplement content does not, whatever its score. Relevance is the one quality no score measures directly.
2. Real organic traffic. Does the site get visitors from search? Most SEO tools estimate a site’s organic traffic, and the trend matters more than the exact figure. A site with a high score and almost no estimated traffic, or traffic that collapsed recently, is a warning sign. Real publications attract readers; link farms attract buyers.
3. Indexed and visible. Are the site’s pages actually in Google? Search for site:example.com (with the real domain) and see whether pages appear. Then check whether the page your link would sit on is likely to be indexed too. A link on a page Google never shows anyone does very little.
4. Editorial. Would the site have published this content and linked to you if no money changed hands? Look at what else it publishes. If every article is a thinly disguised advert with an outbound link, you are looking at a link shop, not a publication. Genuine editorial links tend to come from things you actually did: a local news mention, a supplier or partner listing, an industry association, a useful resource that other people cite.
For local businesses, many of the most valuable mentions do not look like link building at all. Accurate listings, a complete Google Business Profile and reviews from real customers often matter more to enquiries than any guest post. Our local SEO service page explains how map visibility and local listings are handled alongside the website.
When we review a business’s links, we start from the list of sites rather than the score. Ten relevant links from sites your customers actually visit usually tell a better story than a hundred placements with impressive numbers and no readers.
Our contractor SEO case study shows DA in its proper place: reported, but never the goal.
The client. An HDB and condo renovation contractor with 12 workers, based in Jurong East, Singapore, over a 6-month engagement. The business had run for nine years on word-of-mouth referrals. Its website had not been updated in four years, was not indexed for any renovation search term, and it had no Google Business Profile.
The starting position (month 0). Monthly organic visitors were 140. The site ranked on page 1 for 2 keywords, both brand only. It had 0 Google Business Profile reviews, 1 generic “Services” page, 0 project portfolio pages and 1 online enquiry a month. Its Domain Authority was 7.
What the programme did. The case study sets out four phases. Phase 1 (month 1) created the Google Business Profile from scratch and ran a technical audit that resolved 19 crawl errors, added schema sitewide and lifted Mobile Lighthouse from 44 to 73. Phase 2 (months 1-3) replaced the single “Services” page with eight dedicated service pages. Phase 3 (months 2-5) created 12 project portfolio pages. Phase 4 (months 3-6) introduced a post-handover review request.
The ending position (month 6). Monthly organic visitors rose from 140 to 577 (+312%). Keywords ranking on page 1 went from 2 to 21 (+950%). Google Business Profile reviews grew from 0 to 29, and monthly GBP views reached 3,800. Monthly online enquiries went from 1 to 18 (+1,700%), and the site reached the top 3 for “HDB renovation contractor Singapore”. Domain Authority went from 7 to 17 (+10).
Why this matters for DA. Notice what is not on the page: none of the four phases is a link-buying or DA-targeting phase. The score rose as a by-product of the whole programme, alongside a site that became genuinely more useful, more visible locally and more worth mentioning. DA was the last line of the results table, not the first line of the plan. The business result was the jump in enquiries. Renovation businesses weighing a similar approach can see how the work is scoped on our contractor SEO page.
Field notes: In our contractor case study, a 12-worker HDB and condo renovation contractor in Jurong East, Domain Authority went from 7 to 17 over 6 months, yet the programme described on the page had no link-buying phase at all. The work was a Google Business Profile built from scratch, eight dedicated service pages, 12 project portfolio pages and a post-handover review request. Monthly organic visitors rose from 140 to 577, page 1 keywords from 2 to 21, and monthly online enquiries from 1 to 18. The score followed the business result; it did not produce it.
You do not need to ignore domain authority. You need to give it the right weight in your own tracking, so nobody can sell you a story built on it.
Pick one tool and stay with it. Moz DA, Ahrefs DR and Semrush AS should never be mixed in the same report. Note which tool you use and compare like with like, on roughly the same day each time.
Record it quarterly, not weekly. Given how much smaller scores swing between index updates, checking more often mostly records noise. A quarterly figure in a spreadsheet is enough.
Put it at the bottom of the report. List enquiries first, then organic visitors, then rankings for the searches that bring customers, then DA. If an agency’s report reverses that order, ask why.
Note what happened in the same period. If the score moves, write down what else changed: new pages, a press mention, a site migration, a Moz model update. Most movements are explained by something outside your control, and having the context stops anyone from turning a dip into a sales pitch.
Compare against real competitors, not a target. The only comparison that means anything is your site against the sites ranking for the searches you care about, in the same tool. A score of 17 can be strong in a local trade where competitors have little web presence, and weak in a crowded national market.
To see how results are reported across different Singapore industries, with enquiries and rankings shown alongside any authority figure, our full set of SEO case studies lets you compare how differently the numbers moved for each business.
If you have a proposal in front of you and want a second opinion before you sign, you can contact us and we will talk it through.
Domain authority is a useful tool used in the wrong place most of the time. As a quick filter, it helps you spot weak or spammy sites before you spend time on them. As a sales promise, it is close to meaningless: the score belongs to a third-party vendor, it moves when its index or the wider web changes, it is easy to inflate, and Google does not use it.
So treat any proposal that sells DA as the outcome, whether that is “DA 40 in six months”, “DA 50 guest posts” or a high-DA expired domain, as a red flag. Judge links on relevance, real organic traffic, indexing and editorial merit, and judge agencies on enquiries and rankings for searches that matter. Let the score follow, as it did for our contractor client. To understand how we approach this kind of work, our about page explains how we work with Singapore businesses.
Domain authority, strictly Moz Domain Authority, is a score from 1 to 100 that estimates how likely a whole website is to rank compared with other websites. It is calculated mainly from backlink data, especially the number of separate websites linking to a site, using a machine-learning model. It is a third-party estimate created by Moz, not a Google metric, and similar scores from other tools use different formulas.
No. Domain Authority is a Moz metric, and Google representatives have said publicly that Google does not use third-party authority scores. Google’s own ranking systems consider links among many other signals, but Google does not publish a domain-level score. A high DA does not mean Google trusts a site, and a low DA does not stop a strong page from ranking.
Usually because of the vendor, not you. Moz’s crawler does not find every link on every update, so the links it has on record can change. The scale is also relative: when the most heavily linked sites gain links, other scores can slip. Competitors’ link growth and model updates can move scores too. Smaller scores swing more, so a few points either way is normal.
Not on the strength of the score. A high score on a cheap placement often means the score has been inflated by a link network. Check whether the site is relevant to your business, gets real organic traffic, is indexed by Google and publishes genuine editorial content. Also note that Google’s spam policies treat buying links that pass ranking credit as link spam.
Rarely. The links were earned by a different website for different content, so relevance does not carry over. Google’s spam policies specifically cover expired domain abuse, where old domains are repurposed to manipulate rankings. The score may also have been artificially inflated before sale. A useful test is whether you would want the domain if it had no score at all.
No agency controls Moz’s index, its model or the growth of other websites, so a guaranteed score can only be pursued by acquiring links in bulk, which carries risk. A guarantee like this is a red flag. Ask what pages, fixes and link sources the plan includes, and what change in rankings and enquiries the work is meant to produce.
There is no universal number. Domain authority is relative, so what counts as good depends on the sites ranking for your target searches. A modest score can be competitive in a local trade where few competitors invest in their websites, and weak in a crowded national market. Compare your score with the sites you actually compete against, in the same tool.
Quarterly is enough for most businesses. Scores move between index updates for reasons that have nothing to do with your site, especially when the score is low. Record one figure per quarter from one tool, alongside organic visitors, rankings and enquiries, and look at the trend over several quarters rather than reacting to monthly changes.
Look at relevance, real organic traffic, indexing and editorial merit. Ask whether the site covers topics your customers care about, whether it gets visitors from search, whether its pages appear in Google, and whether it would have linked to you without payment. These four checks tell you far more about a link’s value than any single third-party score.
It often rises over time when a site becomes more useful and earns genuine mentions, but it is a lagging and imperfect signal. In our contractor case study, DA went from 7 to 17 over 6 months while the work focused on a Google Business Profile, service pages, portfolio pages and reviews. Treat a rising score as a side effect, not the target.
If you have an SEO proposal or a link offer in front of you and are not sure whether the domain authority claims stand up, we are happy to look at it with you. A free SEO audit reviews how your site actually performs in search, including the quality of the links pointing to it, so you can judge offers on relevance and real traffic rather than a score.
Natalie leads SEO strategy at Singapore SEO Agency, helping local and regional businesses build organic search programmes that drive qualified leads. She specialises in technical SEO and content-led authority building for Singapore SMEs.
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