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How secure are Czechia's domains?
Most businesses in Czechia use a .cz domain. Across 1,266,593 of them, here's how their security stacks up — aggregate patterns only, never an individual business. As of 2026-08-16.
In the .cz zone — covering Czechia — 62.5% of 932,544 graded domains earn an F, well below the 73.8% internet-wide average. DNSSEC adoption is 63.1% here, notably higher than the 6.3% census-wide rate.
We use .cz as a stand-in for Czechia, based on the domain's ending rather than where a company is legally registered — so Czechia businesses using a generic ending like .com aren't counted here.
Grade distribution
| Grade | Domains | Share |
|---|---|---|
| A+ | 777 | 0.1% |
| A | 2,184 | 0.2% |
| B | 27,736 | 2.2% |
| C | 146,598 | 11.6% |
| D | 216,778 | 17.1% |
| F | 872,520 | 68.9% |
See exactly where your own Czechia domain ranks — free and private → Check your domain. Or browse .cz in detail and the most & least secure TLDs.
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