By Miguel Ángel Jiménez, Head of SEO at Gecko Studio
The most opaque part of an SEO audit is neither the technical side nor the content: it is the backlink profile. Whilst a duplicate title or a 5-second LCP are problems you can see during a Screaming Frog crawl, the health of the links pointing to your site lives in an external ecosystem you do not control directly. And that is precisely why the off-page SEO audit — also referred to as a backlink SEO audit — is where the most misjudgements happen: it is either ignored entirely, or approached with alarm at the sight of any link that looks remotely suspicious.
This article is part of our SEO audit guide and focuses on the off-page dimension: how to read your backlink profile with genuine analytical judgement, which signals matter and which are noise, and what decisions to make when something does not add up. To illustrate it, we use data from a real anonymised audit from our client portfolio — one that shows exactly what a healthy, well-managed profile looks like and which signals confirm that an authority-building strategy is working.
What an off-page SEO audit analyses
Off-page SEO encompasses the external signals that Google interprets as indicators of reputation and authority. The most influential are backlinks: references from other domains that function as votes of confidence — though not all votes carry the same weight, nor do they all come from the same origins.
An off-page audit is not a headcount of how many links you have. It is a structured reading of the complete profile: how many distinct domains reference you, what authority they carry, what terms they use to link to you, how quickly that profile is growing, and whether any patterns raise alarm signals — or, conversely, signals that confirm your editorial work is bearing fruit. The difference between an SEO professional who audits backlinks and one who merely counts them is the analytical judgement applied to interpreting that data.
If you want to understand the overall framework first, the starting point is the SEO audit guide. For the technical side — crawlability, Core Web Vitals, hreflang — you can jump to the technical SEO audit. And if what you need is the complete structure of an anonymised project with all blocks covered, the SEO audit template shows it filled in block by block.
The five axes of off-page analysis
1. Unique referring domains versus total backlinks
The first figure to look at is not the total number of backlinks, but how many distinct domains link to you. The gap between the two numbers is informative: if you have 10,000 backlinks from only 15 referring domains, almost your entire profile comes from a handful of repetitive sources. That kind of concentration reduces the value of those links and can trigger algorithmic filters.
What a healthy profile shows is proportionality: as the total number of backlinks grows, so does the number of referring domains. A heavily unbalanced ratio is the first finding that should appear in the audit report.
Tools such as Ahrefs, Semrush or Majestic let you query these figures directly. The Referring Domains tab in Ahrefs, for example, shows the monthly evolution with enough granularity to detect anomalous growth spikes.
2. Quality and authority of linking domains
Not all domains are worth the same. A link from a national media outlet with real traffic is not comparable to one from a generic directory created six months ago. To evaluate the quality of the domains referencing you, the key indicators are:
- Domain Rating (DR) in Ahrefs or its equivalent (DA in Moz, TF in Majestic): a 0–100 scale that estimates the strength of a domain's backlink profile.
- Estimated organic traffic of the linking domain: a high DR without real traffic deserves less credit.
- Topical relevance: a link from a technology portal to a vehicle rental company carries less weight than one from a travel publication or a local media outlet specialising in tourist destinations.
- Domain age and activity: young domains with a burst-publication pattern are suspicious.
In the audit, the goal is to understand the distribution of the profile: what percentage of your referring domains has a DR above 30, how many have real organic traffic, how many are topically relevant. That distribution is more informative than the average DR.
3. Anchor text distribution
The anchor text — the text in which the link appears — is one of the signals most closely interpreted by search algorithms. A natural anchor profile has an approximate composition along these lines:
| Anchor type | Typical percentage |
|---|---|
Naked URL (https://yourdomain.com) | 20–35% |
| Brand name or business name | 15–30% |
| Generic anchors ("click here", "find out more") | 10–20% |
| Mixed anchors (brand + keyword) | 5–15% |
| Exact-match keyword anchors | < 5% |
When the percentage of brand or URL anchors exceeds 50% of linking domains, the anchor profile reflects a business that people know and link to for what it is — not because someone engineered the link text to rank a keyword. It is one of the clearest signals that backlinks are organic and editorial. The real-world case we analyse below illustrates this point exactly.
4. Temporal trend of the profile
The speed and pattern of link growth matters just as much as the quantity. Google does not expect a site to receive 500 new referring domains in a single week organically. When that happens, the algorithm registers it.
In the audit, review the monthly history of referring domains and look for:
- Anomalous growth spikes: a sudden increase in links with no identifiable content campaign or media coverage to account for it.
- Large-scale domain losses: a sudden drop in referring domains can indicate that artificially placed links have been removed, or that domains that used to link to you have permanently disappeared.
- Long-term trend: gradual, steady growth is the healthiest signal of all. When that growth also coincides with the appearance of high-authority editorial links, it confirms that the business's digital reputation is growing genuinely.
5. Broken incoming backlinks
A broken backlink is a link from another domain pointing to a URL on your site that no longer exists — it returns a 404. It represents a double missed opportunity: you lose the authority that link would transfer, and any user arriving via that reference encounters an error.
Identifying and recovering these links is one of the highest-return actions in an off-page audit because it does not require convincing anyone to link to you: the link already exists, you simply need to redirect the target URL correctly. And when the audit reveals that there are none at all — as we will see in the real-world case — that too is a positive finding worth recording.
The real-world case: a vehicle rental company in a tourist destination
To ground this analysis in practice, we use the backlink data from a real audit in our portfolio — anonymised, with no name, domain or identifiable URLs. The site belongs to a vehicle rental and dealership company located in a tourist destination. What makes this case interesting is not that there are problems to resolve, but quite the opposite: it is an example of how to read a healthy profile and which signals confirm that the authority-building work is on track.
Text equivalent (the same data as the chart above):
| Metric | Value | Context |
|---|---|---|
| Domain Rating (DR) | 46 | Medium-high strength; competitive for the local sector |
| Referring domains | 295 | Broad base; includes international press DR 90+ and local press DR ~72 |
| Total backlinks | 1,903 | Healthy ratio (6–7 backlinks per referring domain) |
| Organic keywords | 637 (93 in top 3) | Solid performance; 14.6% in maximum-visibility positions |
| Estimated organic traffic | ~2,418 visits/month | Consistent with DR and keyword strategy |
| Broken backlinks | 0 | Clean profile; no authority lost to dead URLs |
| Brand / exact URL anchor | ~60% of domains | Clear signal of organic editorial linking |
| Minor anomalous anchor | 1 term (3 generic directories) | Unsolicited link with no material impact → monitor |
How to read this profile with judgement
The first figure that stands out is the combination of DR 46 with 295 referring domains and 93 keywords in top 3. For a local or regional business in a tourist destination, that trio is the signature of a profile built over years with consistency: you do not reach that level of authority distribution without genuine editorial coverage.
What confirms that reading is the composition of the profile. When international reference press — with Domain Ratings above 90 — includes the business in editorial content about the destination, and local press adds another layer of regional topical authority, the DR 46 explains itself. It is not a number that has been purchased or artificially inflated: it is the reflection of a real presence in the informational ecosystem of the sector.
The other revealing signal is the backlink ratio. With 1,903 total backlinks and 295 referring domains, the average is roughly 6–7 backlinks per linking domain. That figure is natural: media outlets that cover a business do not do so only once, and sector directories tend to repeat the link across several pages. There is no single domain concentrating thousands of backlinks in an anomalous way. The profile is proportionate.
Zero broken backlinks: an indicator of active maintenance
A profile with 295 referring domains and 1,903 backlinks having not a single incoming link pointing to a broken URL is an unusual finding. In most audits, even in healthy profiles, at least some broken backlinks are identified — lost through architectural changes, renamed URLs or pages that no longer exist.
In this case, the result is zero. That can mean one of two things: either the site's history has not involved major URL restructuring, or when it has, the changes were handled correctly with redirects. Either way, it is an indicator of active site maintenance. From an off-page audit standpoint, the finding is positive and requires no action — it is simply documented as a signal of profile health.
Anchor text: 60% brand anchors is exactly what you want to see
The anchor distribution is the data point that speaks most clearly to the nature of the links. When approximately 60% of the domains linking to you do so with the brand name or a direct URL, you are seeing the natural behaviour of someone linking to a business because they want to reference it — not because someone engineered the anchor text to rank a keyword.
The remaining 28% of natural keyword anchors comes mainly from sector directories and local press that names the type of service when referencing the business. That too is a healthy pattern: journalists and editors do not think about anchor text when they write an article; they simply link with whatever text makes sense in context.
This profile does contain one minor anomalous anchor: a vehicle model unrelated to the brand appears as link text in three generic directories. This is not a pattern of mass linking nor a signal of active negative SEO — it is only three low-relevance domains. The correct diagnosis is to document it, set up monitoring to detect if it grows, and take no active action. The algorithm is already treating that signal for what it is: irrelevant noise in an otherwise solid profile.
What 93 keywords in top 3 confirms
A healthy backlink profile should correlate with organic performance. In this case, 93 keywords in top 3 out of a total of 637 represents 14.6% maximum-visibility coverage — a high proportion that confirms Google is valuing the domain's authority to serve its pages in top positions.
The estimated 2,418 monthly visits are consistent with that profile. For a vehicle rental business in a tourist destination — where demand has strong seasonality in season and where online competition includes large booking platforms with far greater link-building budgets — those figures indicate that the off-page SEO work is contributing in a meaningful, measurable way to organic performance.
Artificial construction signals: what to detect beyond the healthy profile
The case above shows what a well-built profile looks like. To complete the analytical picture, it is useful to know the patterns that indicate a profile was built with practices Google considers manipulative. Identifying them matters both for the site being analysed and for understanding the competitive context of the sector.
- PBN domains (Private Blog Networks): artificially created blog networks designed to pass authority. They typically feature sparse content, simultaneous publication across multiple domains and no genuine editorial activity.
- Bulk low-quality directories: hundreds of links from generic directories with no traffic or editorial filtering.
- Forum and comment spam: profiles created solely to drop links with exact-match keyword anchors.
- Recycled expired domains: sites that once held authority, purchased to redirect their backlink profile towards other projects.
- Heavily unbalanced follow/nofollow ratio: a healthy profile mixes both link attributes. A profile where 99% of links are dofollow from low-reputation domains is unusual and merits further analysis.
The presence of some of these patterns does not automatically imply negative consequences — Google filters and ignores many such signals — but it does indicate that the profile requires a more detailed reading before any decision is taken.
What to do when the profile has weak links
When the audit reveals a significant volume of problematic links — whether actively built using now-obsolete practices or arriving unsolicited from third parties — the first question is not what to do with them, but how much real damage they are actually causing.
Active intervention makes sense when at least two of these three conditions are met:
- There is a clear temporal correlation between the mass appearance of those links and an organic traffic drop that has no other explanation.
- The anchor profile is so skewed towards exact-match keywords on low-reputation domains that no new authority-building strategy can compensate in the short term.
- The site has received a manual penalty notification in Google Search Console related to its link profile.
In the absence of those conditions, the correct protocol is:
Document. Export and retain the complete list with link URL, domain, DR, anchor and date of first appearance. This inventory serves as a historical record, a basis for future decisions, and evidence if the pattern worsens.
Evaluate the origin. A low-quality link built actively in the past using now-obsolete practices has a different context from one placed by a third party without knowledge or consent. Documenting that distinction is part of the diagnosis.
Prioritise qualitative analysis over quantitative. A low DR is not synonymous with a harmful link. A personal blog with DR 5 that mentions the business in a genuine context does not represent the same risk as a spam domain with 300 exact-match keyword anchors pointing to the homepage from the same server. Quality is not measured with a single number.
Build authority going forwards. The most effective way to reduce the relative impact of a low-quality segment of the profile is not to try to eliminate that segment — which in many cases is not within your control — but to build more real authority that dilutes and surpasses it. More relevant referring domains, from editorial publications with real organic traffic, in pertinent topical context. That is precisely the strategy the vehicle rental case illustrates: a broad base of editorial press coverage that renders any minor anomalous anchor statistically irrelevant.
Integrate the off-page audit into the SEO cycle
Auditing the backlink profile is not a one-off task. For it to deliver real value, it needs to be integrated as a periodic review — ideally quarterly — within the ongoing SEO monitoring of a project.
Each quarter, it is worth reviewing:
- Newly acquired referring domains: are they the result of your own actions or of organic coverage? Is there any suspicious pattern of sudden growth?
- Lost domains: are these temporary or permanent losses? How much DR do those losses represent?
- Changes in anchor distribution: does the composition remain natural, or has there been a shift towards artificial patterns?
- New broken backlinks: sites change over time, and URLs that previously responded correctly may have disappeared. A quarterly scan for broken links prevents them from accumulating unnoticed.
This ongoing monitoring allows problems to be detected early, before they affect organic performance and require a more costly intervention.
Off-page SEO audit: analytical judgement over a backlink profile
A well-executed backlink audit does not look for problems where there are none, nor does it react to every anomaly without context. What it does is read the profile with judgement: how much authority is there, where does it come from, how natural is its distribution, and which actions — if any — are worth taking.
The vehicle rental case we have analysed shows the other end of the spectrum: a profile with real editorial coverage, dominant organic anchors, zero broken backlinks and organic performance consistent with the accumulated authority. That too is a finding worth documenting, because it confirms that the authority-building strategy is working and that the work now is to maintain and expand it.
If you have questions about the state of your site's backlink profile or would like us to analyse it as part of a full diagnosis, at Gecko Studio we carry out full SEO audits that include this block at the same level of detail you see here. And if you want to understand how this block fits into the broader diagnostic framework, you will find it documented in the SEO audit template with all blocks filled in.
Frequently asked questions about off-page SEO audits
What is the difference between off-page SEO and on-page SEO?
On-page SEO covers all the factors under direct control within the site itself: URL structure, titles, meta tags, content, page speed, hreflang, internal linking. Off-page SEO refers to signals that live outside the site and are not directly controlled: backlinks from other domains, brand mentions, perceived authority within the web ecosystem. Both dimensions influence organic rankings, but they are audited with different tools and criteria. A complete SEO audit covers both.
What is Domain Rating and what are its limitations?
Domain Rating (DR) is Ahrefs' metric estimating the strength of a domain's backlink profile on a scale of 0 to 100. It is useful as a comparative reference, but it has significant limitations: it does not reflect the topical relevance of linking domains, it does not distinguish between a genuine editorial link and one in an automated directory, and it may lag behind recent changes to the profile. Using it as the sole quality indicator leads to flawed conclusions. DR is a starting point, not a verdict.
What tool should I use for a backlink SEO audit?
The most widely used tools for auditing a backlink profile are Ahrefs, Semrush, Moz and Majestic. Each maintains its own crawl index, so data can vary between them. For professional audits, cross-referencing at least two sources is recommended. Google Search Console has its own links report with the advantage of showing only what Google has actually crawled and confirmed — the most directly relevant data for assessing real ranking impact.
How many referring domains does a site need to rank well?
There is no universal number. The quantity of referring domains required depends on the competitiveness of the target keywords and the authority level of sites already ranking for them. A low-competition niche can rank with 15–20 quality referring domains; a highly contested keyword may require hundreds. The right benchmark is not any generic standard: it is the profile of the competitors already ranking where you want to be.
Do nofollow backlinks affect rankings?
The rel="nofollow", rel="sponsored" and rel="ugc" attributes instruct Google not to treat those links as editorial votes of confidence. However, since 2019 Google treats them as hints rather than absolute instructions, which means they may have a marginal effect in some cases. In practice, nofollow links from high-authority media outlets still carry value for the referral traffic they generate and the topical relevance signal they imply, even if they do not pass PageRank directly.
What should I do if I find an anomalous anchor text in the profile?
The first step is to contextualise: how many domains are behind that anchor, what is their authority and relevance, and when did it appear? If it amounts to a handful of generic directories with an anchor that does not fit the brand, and organic traffic is stable, the typical diagnosis is that Google is ignoring that signal as noise. The correct action in that case is to document the pattern, set up monitoring alerts in Ahrefs, and not intervene prematurely. A single anomalous anchor in a broad, diversified profile carries very little statistical weight.
How often should I review the backlink profile?
For active projects, a quarterly review is sufficient in most cases. Projects in highly competitive markets or with a history of artificial linking may require monthly reviews. The most important thing is to maintain an up-to-date inventory of referring domains — new, lost and broken — so that the audit represents a trend rather than a static snapshot. Tools such as Ahrefs allow you to configure automatic alerts for new referring domains, making continuous monitoring straightforward without the need for frequent manual analyses.