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Is .plumbing safe? The state of .plumbing domain security
.plumbing is riskier than the internet average. Across 2,503 graded .plumbing domains, 82.2% score an F — worse than the 78.3% global average — heavier on exposed domains than the web as a whole. 1.5% earn a B or better. Most .plumbing 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 2,503 graded .plumbing domains, 82.2% earn an F — above the 78.3% internet-wide average. Only 0.1% reach an A or A+ — the highest protection tier in the census.
How do .plumbing domains score?
Aggregate grade distribution across all graded .plumbing domains — we never publish an individual business's grade. As of 2026-08-16.
| Grade | Domains | Share |
|---|---|---|
| A+ | 0 | 0% |
| A | 2 | 0.1% |
| B | 35 | 1.4% |
| C | 148 | 5.9% |
| D | 260 | 10.4% |
| F | 2,058 | 82.2% |
Does .plumbing 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 .plumbing doesn't protect you, and a high-F-share ending doesn't doom you: a correctly configured .plumbing domain earns an A while the crowd around it sits at F.
Want to know where your .plumbing 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 .plumbing safe?
On average, .plumbing is riskier than the internet average: 82.2% of its 2,503 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 .plumbing domains?
17.8% of .plumbing domains score above an F and 1.5% 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 .plumbing 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 .plumbing too.
What does "grade F" mean for a .plumbing 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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