Defaults.Exposed › By TLD › .bio
Is .bio safe? The state of .bio domain security
.bio is riskier than the internet average. Across 78,033 graded .bio domains, 85.6% score an F — worse than the 78.3% global average — heavier on exposed domains than the web as a whole. 1.1% earn a B or better. Most .bio domains can still be impersonated in email, but the ending shifts the odds, not your own domain's grade. As of 2026-08-16.
Of 65,310 graded .bio domains, 86.5% earn an F — well above the 73.8% internet-wide average. DMARC enforcement here stands at 8.5% — below the 11.8% census-wide rate.
How do .bio domains score?
Aggregate grade distribution across all graded .bio domains — we never publish an individual business's grade. As of 2026-08-16.
| Grade | Domains | Share |
|---|---|---|
| A+ | 11 | 0% |
| A | 69 | 0.1% |
| B | 784 | 1% |
| C | 3,296 | 4.2% |
| D | 7,043 | 9% |
| F | 66,830 | 85.6% |
Does .bio make a domain secure?
No — and that's the most important thing to know. A domain's grade is decided by how it is configured (SPF, DMARC, HTTPS, DNS), not by its ending. Choosing .bio doesn't protect you, and a high-F-share ending doesn't doom you: a correctly configured .bio domain earns an A while the crowd around it sits at F.
Want to know where your .bio domain ranks? Check it privately and free — we only ever show an individual domain's grade to its verified owner. Run the free check →
Frequently asked questions
Is .bio safe?
On average, .bio is riskier than the internet average: 85.6% of its 78,033 graded domains score an F as of 2026-08-16, against a 78.3% global average. Most domains on every ending are exposed — the ending shifts the odds, not your own domain's grade.
How secure are .bio domains?
14.4% of .bio domains score above an F and 1.1% earn a B or better. The rest fail the basic externally observable protections, most importantly enforced SPF and DMARC, so they can be impersonated in email.
Does choosing .bio make my domain secure?
No. A domain's grade comes from how it is configured — SPF, DMARC, HTTPS, DNS — not from its ending. A well-configured domain earns an A on any ending; an unconfigured one sits at F on .bio too.
What does "grade F" mean for a .bio domain?
It fails the basic protections we can observe from outside — above all, it has no enforced SPF and DMARC, so its email can be forged and its customers targeted with convincing fakes.
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