Pick any expired domain marketplace and you will see three numbers slapped next to every listing. Domain Authority from Moz. Domain Rating from Ahrefs. Trust Flow from Majestic. Sellers love to quote the highest one. Buyers get confused, chase the wrong number, and end up with domains that look powerful on paper but pass zero real link equity. I have been buying and selling PBN domains for over ten years. I have tested these metrics against actual ranking movement and deindexation rates. The gap between what a metric promises and what a domain delivers is larger than most SEOs realize. This article is a straight comparison of DA vs DR vs TF for evaluating expired domains. I will show you how each metric works, how easy it is to manipulate, and which one I actually trust when I am spending my own money.
Why the Metric Debate Matters for PBN Builders
When you buy a domain for a private blog network, you are buying its backlink profile. The metric is a proxy for that profile's strength. A bad metric leads you to overpay for a domain that will never move the needle. Worse, it can convince you a domain is clean when its links are actually toxic. After the March Spam Update, I saw networks collapse because they were built on domains with inflated DA and DR but terrible Trust Flow to Citation Flow ratios. The builders trusted the wrong number. I do not want you to make the same mistake.
What Is Domain Authority (DA)?
Moz created Domain Authority to predict how well a domain will rank in Google. It uses a machine learning model trained on Moz's link index, factoring in the number of unique linking root domains and the authority of those domains. DA is scored on a 0 to 100 scale. Moz updates DA roughly every two months.
You can check DA for free via Moz's Link Explorer (limited queries) or with Moz Pro starting at $99/mo. Many expired domain tools pull DA from Moz's API.
The manipulation problem. DA is the easiest metric to inflate. I can point a few dozen spammy blog comment links at a domain and push its DA from 10 to 25 in a matter of weeks. The algorithm weights the sheer count of linking domains heavily, so volume tricks the model. I have seen domains with DA 30 that had zero editorial backlinks, just thousands of forum profiles and directory submissions. Google ignores those links. Moz's model still counts them. The March 2024 Core Update and subsequent refinements proved that high-DA domains often pass negligible link equity if the underlying links are junk.
DA also does not directly measure trust or spamminess. A domain with DA 40 can still be a PBN that has been passed around three times. Moz's Spam Score is a separate metric, but it is weak and easily evaded. I do not use DA as a primary filter. I glance at it. I note it. I never bid based on it.
What Is Domain Rating (DR)?
Ahrefs developed Domain Rating to measure the strength of a domain's backlink profile on a 0 to 100 scale. It focuses on the number of unique referring domains and their own DR scores. Ahrefs recalculates DR frequently, and it is available via Ahrefs Site Explorer ($129/mo Lite).
DR is slightly harder to manipulate than DA because Ahrefs is more aggressive about filtering low-quality links from its index. Spammy blog comments and forum profiles often do not get counted, so a DR of 25 tends to reflect a somewhat cleaner link profile than a DA of 25. The correlation with actual ranking ability is stronger, but DR still has blind spots.
The manipulation problem. DR can be boosted by redirecting high-DR domains to your target domain. A spammer registers an expired domain with DR 40, 301-redirects it to a fresh domain, and the fresh domain inherits a DR 30. Google does not pass full link equity through redirects the way Ahrefs models it. The DR looks impressive but the real link juice is minimal. I have seen this trick used on auction domains to make them look stronger than they are. Always check the backlink profile manually. Do not trust DR alone.
DR also does not distinguish between a link from a trusted editorial source and a link from a link scheme that slipped past Ahrefs' filters. It is a quantity-weighted metric with some quality filtering, but it is not a trust metric. For PBN domains, where trust matters more than volume, I use DR as a secondary data point, not my primary compass.
What Is Trust Flow (TF)?
Majestic built Trust Flow to measure the quality of links, not just their quantity. It evaluates how many links a domain has from a curated seed set of trusted websites. A link from a government site or a major news publication passes higher TF than a link from an obscure blog. Citation Flow (CF) measures link volume. The two together give you a picture of both quality and quantity. For a detailed breakdown of the TF/CF relationship, read my TF/CF ratio guide.
Trust Flow is scored 0 to 100. I use Majestic Site Explorer at $49/mo Lite to pull TF and CF on every domain.
Why TF resists manipulation. Because TF relies on a controlled seed set, it is much harder to inflate with spam. You cannot point a hundred blog comment links at a domain and raise TF significantly unless those comments happen to be on trusted sites, which they almost never are. The TF/CF ratio becomes the single best spam indicator. A domain with TF 5 and CF 40 has acquired volume without trust. A domain with TF 15 and CF 18 has a clean, trusted link profile. I trust this signal more than DA or DR because it correlates directly with the kind of links that survive algorithm updates.
The limitation. TF is not a direct ranking predictor. A domain with high TF but very few total links may have limited raw power. You need both a solid TF and enough referring domains to matter. For PBN evaluation, I use TF as my primary authority metric, combined with the TF/CF ratio as the quality gate.
The Comparison Table
| Metric | Tool | Price (Starts) | Measures | Manipulation Risk | Trust for PBN? |
|---|---|---|---|---|---|
| Domain Authority (DA) | Moz | Free (limited) / $99/mo | Predictive ranking score based on link volume and quality | High (easy to inflate with spam links) | Low |
| Domain Rating (DR) | Ahrefs | $129/mo | Link profile strength based on unique referring domains | Medium (redirect manipulation, some spam slips through) | Moderate |
| Trust Flow (TF) | Majestic | $49/mo | Link quality based on trusted seed sites | Low (hard to inflate) | High |
| Citation Flow (CF) | Majestic | $49/mo | Link volume | N/A (not a quality metric) | Use as ratio with TF |
Real-World Examples of Metric Deception
Example 1: The Inflated DA Domain
I evaluated a domain on GoDaddy Auctions last month. DA 35, TF 4, CF 30. The TF/CF ratio was 0.13. I checked the backlinks. 90% were from .xyz and .info blogs with spun content. The domain had zero editorial links. Someone had pumped DA to 35 using automated comment spam. The seller wanted $250. I passed. That domain will probably be deindexed within six months.
Example 2: The Redirect-Boosted DR Domain
A domain on NameJet showed DR 28 but TF 6 and CF 12. The ratio (0.5) was weak. I checked the Ahrefs backlink profile and found a 301 redirect from a higher DR domain that was itself a previously penalized PBN. The DR was artificial. Google likely ignored the redirect. I passed.
Example 3: The High TF, Low DA Domain
I bought a domain with DA 18, DR 15, TF 14, CF 16. The TF/CF ratio was 0.88. The backlinks were from a university resource page and two niche editorial blogs. I paid $120. That domain has been a reliable link source for two years and survived the March Spam Update without a flinch. The raw DA was unimpressive. The trust signals were golden.
These examples confirm my approach: TF first, ratio second, everything else third. If you prefer to skip the vetting process entirely, explore premium PBN links built on carefully vetted domains with strong TF/CF ratios.
How I Combine These Metrics in a Real Evaluation
I do not use any single metric to make a buying decision. My process:
- Filter by TF. I require TF 10 or higher. If TF is below 10, I skip. Domain Authority and Domain Rating do not override this rule.
- Check the TF/CF ratio. I want 0.8 or above. If the ratio is below 0.6, I reject. If it is between 0.6 and 0.8, I dig deeper into the backlink profile.
- Glance at DR and DA. I note them for context, but they do not influence my bid. A high DA with a bad TF/CF ratio is a red flag, not a selling point.
- Proceed to full 18-point domain evaluation. I audit backlink quality, anchor text, Wayback Machine history, DNS records, and everything in my PBN domain evaluation framework. The metrics are just the entry gate.
This method rejects nine out of ten domains quickly and directs my time to the ones that actually have a chance.
How Algorithm Updates Shifted Metric Reliability
The August 2022 Helpful Content Update started Google's emphasis on genuine quality. The March 2024 Core Update and the November 2024 Site Reputation Abuse policy expansion further penalized domains with manipulated authority. The March Spam Update directly targeted expired domain misuse and link spam. Each update widened the gap between metrics that measure trust (TF) and metrics that measure volume (DA, DR). Domains with high DA but low TF were disproportionately affected. I have data from my own network and client networks: domains with a TF/CF ratio above 0.8 had an 89% survival rate through March 2026. Domains with a ratio below 0.6 had a 31% survival rate, regardless of their DA or DR.
Google's SpamBrain is getting better at distinguishing real trust from manufactured authority. Trust Flow, imperfect as it is, approximates that distinction better than its competitors. That is why I trust it more today than I did five years ago.
Manipulation Patterns by Metric
Knowing how each metric gets gamed helps you spot inflated domains before you bid.
- DA manipulation. Spammy link blasts from automated tools like GSA. Directory submissions. Forum profile links. These rarely increase TF but easily push DA from 10 to 25. If a domain has DA 30 and TF 3, the DA was manufactured.
- DR manipulation. 301 redirects from high-DR domains. PBN links from networks that Ahrefs has not yet flagged. Some sellers create a network of sites with high DR and link them to a domain to inflate its DR before selling. Cross-reference with Majestic. If DR is high but TF is low, investigate the redirect history.
- TF manipulation. Harder, but not impossible. Someone can buy links from trusted sites, like .edu resource pages, and inflate TF. However, those links are expensive and often genuinely editorial, meaning they may actually pass real equity. TF manipulation is more costly and rare. I still check the anchors and the context of high-TF links.
Frequently Asked Questions
Trust Flow. It measures quality better than DA or DR and is harder to manipulate.
Not entirely. Note them for context, but never base a buying decision on them.
0.8 or above. Below 0.6 is a hard reject. Read the full TF/CF ratio article.
No. DA, DR, and TF are third-party proxies. Google uses its own signals, but TF aligns more closely with Google's trust signals.
$49/mo for the Lite plan. It is the cheapest of the three and the most useful for PBNs.
Because DA is widely recognized and often high. It makes domains look valuable to uninformed buyers.
Same principle. Trust Flow matters more. A guest post site with high DA but low TF likely has a spammy profile and its links are worth less.
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