Spam Score Explained: What’s a Safe Number for an Expired Domain?
You’ve probably seen the spam score metric when researching expired domains — but what does it actually mean? And more importantly, what score is safe to buy?
This guide breaks down exactly how Moz’s spam score works, what thresholds experienced domain investors use, and how to make sense of it in the context of your full domain evaluation.
What Is Spam Score?
Spam score is a Moz metric — expressed as a percentage from 0% to 100% — that estimates how likely a domain is to have a manipulative or spammy link profile. It’s based on a machine learning model trained on manually penalized sites, looking for patterns that correlate with Google penalties.
A high spam score doesn’t mean the domain is spam — but it does mean the domain looks like sites that Google has penalized. The more it looks like those sites, the higher the score.
What Factors Increase Spam Score?
Moz’s model considers dozens of signals, but the most common contributors include:
- A very high ratio of exact-match anchor text in backlinks
- Links coming predominantly from low-quality or foreign directories
- Thin or near-duplicate content in the domain’s history
- Links from sites with very low page authority
- Sudden spikes in backlinks (often a sign of a link scheme)
What Spam Score Is Safe?
Here are the thresholds most experienced domain investors use:
| Spam Score | Assessment |
|---|---|
| 0–4% | Very clean. Safe to buy. |
| 5–9% | Acceptable. Do additional backlink checks. |
| 10–19% | Caution. Review backlinks carefully before buying. |
| 20–30% | High risk. Not recommended unless you can identify and disavow bad links. |
| 30%+ | Avoid. Very likely to carry a link penalty. |
These are general guidelines — context matters. A DA 60 domain with 8% spam score may be perfectly fine. A DA 15 domain with 8% spam score is more concerning because the legitimate link equity is thinner.
Can You Fix a High Spam Score Domain?
Sometimes. If the high spam score is driven by a batch of identifiable, low-quality backlinks, you can submit a Google Disavow file to tell Google to ignore those links. This can improve the domain’s standing over time.
However, this process is slow (months, not weeks) and uncertain. For most use cases, it’s not worth the effort compared to simply finding a cleaner domain.
Spam Score vs. Blacklist Status: What’s the Difference?
These are often confused but measure different things:
- Spam score is a predictive metric — it estimates how risky a domain’s link profile looks based on patterns
- Blacklist status is a definitive flag — it means the domain has already been flagged by spam or malware databases
A domain can have a low spam score and still be blacklisted, or a high spam score and not be blacklisted. Check both, every time.
How to Check Spam Score for Free
Use our Free Expired Domain Analyzer to check a domain’s Moz spam score alongside its DA, blacklist status, and archive history — all in one free report.
If the spam score comes back above 10%, dig into the backlink profile with Ahrefs or Moz Link Explorer to understand what’s driving it before making a decision.
Conclusion
Spam score is a fast, effective filter for eliminating risky expired domains. Aim for under 5% for a clean buy, treat 5–9% with caution, and think hard before buying anything above 10%.
Combined with blacklist status, DA, and archive history, spam score gives you a well-rounded picture of whether a domain is worth your investment.
