In this guide
- Why vetting matters more than buying cheap
- The 9 metrics to check, in order
- Wayback Machine inspection: what to look for
- Anchor text profile analysis
- Referring domains quality audit
- A scoring framework: buy / skip / negotiate
- Tools and costs
- Common vetting errors that cost money
- Frequently asked questions
The difference between an expired domain that lifts your authority and one that drags it down is almost entirely upstream — in the vetting process before you buy. This is the systematic checklist I use to evaluate expired domain candidates: 9 metrics, the order to check them, the thresholds that distinguish a buy from a skip, and the edge cases worth negotiating on. A 30-minute vetting saves you from a multi-thousand-dollar mistake.
Why vetting matters more than buying cheap
The temptation with expired domains is to chase price — buy 10 cheap ones for the cost of 1 well-vetted one. The math doesn't work. A contaminated expired domain (previously hosted casino content, pharma spam, or has a toxic anchor profile) actively damages the receiving site when you 301 it. The downside isn't "no benefit" — it's a manual action or algorithm penalty that takes 6-12 months to recover from.
Operating principle: one well-vetted DR 35 domain for $400 outperforms five DR 35 contaminated domains for $50 each. The vetting is the asset, not the metrics on the surface.
The 9 metrics to check, in order
Order matters because each step gates the next. If the domain fails an earlier check, don't waste time on the later ones.
1. Domain Rating (Ahrefs)
Threshold: 20+ minimum, 30-40 sweet spot, 50+ requires extra scrutiny.
Below DR 20, the link equity transfer is too small to justify the operational overhead. Above DR 50, the domain is more likely to be on the radar of competitors and to have been previously targeted by PBN operators leaving footprints.
2. Trust Flow (Majestic)
Threshold: TF 10+, with TF/CF ratio above 0.5.
Trust Flow measures the quality of the backlink profile based on proximity to Majestic's "trust seed" sites. A domain with high DR but low TF (DR 40, TF 5) almost always has a manipulated backlink profile — high volume of low-quality links boosting DR while Majestic's quality model detects the weakness.
3. Spam Score (Moz)
Threshold: under 10% (some operators accept under 15%, but more is risky).
Moz's Spam Score evaluates patterns associated with penalized sites. Anything over 30% is a hard skip — even if the other metrics look strong, the domain has signals Moz's model has correlated with Google penalties historically.
4. Referring domain count
Threshold: 30+ unique referring domains for the domain to be worth the effort.
Fewer than 30 RDs means the equity transfer is marginal. Sometimes worth pursuing for very high-quality individual links (DR 80+ from a major publication), but typically not.
5. Wayback Machine history
Threshold: the domain previously hosted legitimate content in a sane topic, not casino/pharma/adult/MFA spam.
This is the single most important non-numerical check. Detailed inspection covered in the section below.
6. Anchor text profile
Threshold: no over-optimized exact-match anchors. Branded and naked URL anchors should dominate.
Detailed inspection covered in the section below.
7. Referring domain quality
Threshold: the top 20 referring domains should be from real sites, not link networks.
Detailed inspection covered in the section below.
8. Country distribution of referring traffic and links
Threshold: at least one of the country profiles (links or historical traffic) aligns with your target market.
A domain with 80% Russian and Chinese referring traffic redirected to a US business website looks unnatural and may trigger manual review. Geographic alignment matters even when the metrics look strong.
9. Pricing relative to metrics
Threshold: $5-12 per DR point for niche domains, $10-25 per DR point for generic.
Final calibration. A DR 35 domain at $200 (~$5.70 per DR point) priced fairly. The same domain at $1,200 is overpriced — the market is offering you cheaper paths to the same DR.
Wayback Machine inspection: what to look for
The Wayback Machine inspection separates "actually worth buying" from "metrics look good but it was a porn site in 2014." This is the most often-skipped step and the most expensive to skip.
The 5-snapshot rule
Pull at least 5 historical snapshots spanning the domain's active years. Look at:
- First snapshot after the domain was registered — was it a real business or parked spam?
- A middle snapshot during the active years — was the content legitimate?
- The last snapshot before content stopped updating — what was the final state?
- 2-3 snapshots in between to see if content patterns shifted (sometimes a legitimate site gets sold and turned into spam)
Red flag patterns
- Made-for-AdSense site. Pages cluttered with ads, thin content, generic templates. Google has indirect signals these were always low quality.
- Affiliate spam. Long lists of "top 10" reviews with no editorial voice, every product linked to Amazon affiliate.
- Topic switches. Domain was about gardening in 2014, sneakers in 2017, crypto in 2020. Strong signal of PBN ownership or repeated flipping.
- Adult content at any point. Even brief windows of adult content can leave permanent reputation tags. Hard skip.
- Gambling, casino, pharma content. Same as adult. Hard skip.
- Mass-translated content. Identical structure with different languages — typical PBN footprint.
- Pure 404 or "Coming Soon" for the entire history. Domain never had real content; the backlinks are likely artifacts of typo squatting or parking.
Green flag patterns
- Single coherent topic over the active years (a real business or blog in one niche)
- Author names, contact info, real "about us" pages — signals a real entity behind the site
- Content that ages gracefully — references that anchor the content to specific years naturally
- External validation (mentions of trade conferences, press coverage, real customer references)
Anchor text profile analysis
Pull the anchor distribution from Ahrefs (Backlink profile → Anchors). The healthy profile pattern:
- 40-60%: Branded anchors (the original domain name, brand variations)
- 15-25%: Naked URL anchors (the URL itself as anchor)
- 10-20%: Generic anchors ("click here", "this site", "read more")
- 5-10%: Partial-match anchors (containing relevant keywords with context)
- Under 5%: Exact-match anchors (precise keyword targeting)
Red flag patterns:
- Exact-match anchors over 20% of total — over-optimization signal
- Foreign-language anchors when the domain was English (or vice versa)
- Casino/pharma/adult anchors even in low percentages — the domain was targeted by these networks at some point
- Bizarre anchor diversity (anchors in 20+ languages) — typical PBN-injected pattern
Referring domains quality audit
Pull the referring domains list (Ahrefs → Referring domains, sorted by DR descending). The top 20 referring domains should be the easiest to verify:
- Click through to each top RD's homepage. Does it look like a real site?
- Check the linking page in the Wayback Machine — did the link exist when the page was first published, or was it added later (suggesting paid placement)?
- Look at the editorial tone of the linking page — does the link make sense in context, or does it appear inserted artificially?
- For media sites, search for "[outlet name] guest post pitch" to verify they actually publish guest content (legitimate referring domain) vs. just sold the link
Red flag: if 80%+ of the top RDs look like PBN sites (templated WordPress, generic content, no real audience signal), the domain's metrics are inflated and the equity transfer will be lower than DR suggests.
A scoring framework: buy / skip / negotiate
After running all 9 checks, score each criterion:
- Pass: 1 point
- Borderline: 0.5 points
- Fail: 0 points
- Hard skip: -2 points (any hard skip means abandon, regardless of total score)
Total scoring:
- 8-9 points: Strong buy at asking price
- 6-7.5 points: Buy if you can negotiate 15-25% off
- 4-5.5 points: Skip unless you can negotiate 40%+ off and have very specific use
- Under 4 points: Skip
Hard skip criteria (any one = abandon):
- Adult, gambling, or pharma content in Wayback history
- Topic switches between 3+ unrelated niches
- Spam score over 30%
- Exact-match anchor concentration over 30%
- Top RDs are visibly PBN sites
Tools and costs
- Ahrefs — DR, referring domains, anchor analysis. $129/mo minimum.
- Majestic — TF/CF. $50/mo for basic.
- Moz Pro — Spam Score. $99/mo, but only needed for the spam score check.
- Wayback Machine — free.
- SpamZilla — pre-filtered expired domain prospects with most metrics aggregated. $97/mo. Worth it if doing volume.
- ExpiredDomains.net — domain prospecting database. Free tier available.
For an operator buying 1-3 domains per month, the full tool stack at $375/mo is justified if even one well-vetted domain at $400 generates more SEO equity than 3 marginal ones at the same cost. The math is real when you're not running on hope.
Common vetting errors that cost money
- Buying on DR alone. A DR 40 domain with bad anchor profile, spammy referring domains, and adult Wayback history is a liability, not an asset. DR is one signal among many.
- Skipping the Wayback check. The metrics tools don't tell you what content the domain hosted. Without Wayback inspection, you're buying blind.
- Accepting the seller's representation of the domain. Auction listings and broker pitches are sales material. Verify everything independently.
- Bidding under time pressure without completing the checklist. Auction expiry creates artificial urgency. A domain you didn't fully vet is a domain you shouldn't buy, no matter how attractive the price looks.
- Believing "I'll just disavow the bad links." Disavow takes weeks to process, and a contaminated profile leaves residual signals. Better not to inherit the problem in the first place.
- Ignoring country/language mismatches. A Russian domain redirected to a US business doesn't make sense organically and may trigger reviews.
Frequently asked questions
How long should I spend vetting one expired domain?
30-60 minutes for a domain in the $100-500 range. Up to 2 hours for domains above $500 or domains that would feed into a critical project. The cost of a thorough check is trivial compared to the cost of a contaminated asset.
What's the minimum acceptable Domain Rating for purchase?
DR 20 is the practical floor — below that, the equity transfer is too small to justify the operational overhead. Sweet spot is DR 25-40, where prices are reasonable and competitor visibility is lower. Above DR 50, scrutiny needs to be much higher because the domain attracts more sophisticated PBN operators.
Can I use these metrics to spot-vet many domains quickly?
Yes. Build a Google Sheet with the 9 metrics as columns. Spend 5-10 minutes per domain entering data. Run all your prospects through this initial screen, then do the full 30-60 minute deep vetting only on the top 10-20% that pass the screen.
How do I check Wayback Machine if the domain only has a few snapshots?
Limited snapshots are a yellow flag — it usually means the site didn't have meaningful traffic or wasn't actively crawled. Cross-reference with archive.today (sometimes has captures the Wayback Machine missed) and check Google's cache if the domain only recently expired.
Is spam score a deal-breaker if everything else looks good?
Above 30% is a hard skip. Between 15-30% is a yellow flag — only proceed if you have a specific reason to override (e.g., legitimate niche where the spam score is inflated by a few unfortunate referring patterns rather than systemic issues).
How do I value time spent vetting vs the cost of the domain?
An hour spent vetting a $300-500 domain is good ROI even if you sometimes pass on good opportunities. An hour vetting a $50 domain is overhead — for cheaper domains, run the quick 9-metric screen only, skip the deep dives. Calibrate effort to dollar exposure.
For the strategic context on why expired domains work, how to redirect them, and the full operational playbook, see the pillar: How to Buy Expired Domains and 301 Redirect Them for SEO. For the marketplace landscape (where to find them), where to buy expired domains. For the strategic decision on what to do once you own one, expired domain redirect vs. rebuild.