Czechia is an open hosting market that competes on the first year. On the .cz active-domains book, hosting-relationship concentration — hosting competitors only, with CDN, SaaS-builder and DNS-infrastructure actors excluded — is an HHI of 1,024: about 9.8 effective owners of the customer relationship, and no single actor holds more than 21.1% of it. The number a buyer can compare is only half-open — at least 4 of the 8 tracked Czech storefronts advertise an introductory rate, and storefronts serving 41.2% of captured relationships publish what year two costs; the rest do not. That count is a floor rather than a half: a storefront that never shows a renewal cannot be counted either way, so it sits with the rest. The market word is webhosting.
“Concentration” is three different questions, and they have three different answers. Hosting-relationship HHI (1,024) measures economic market power — who owns the customer relationship — counting hosting competitors only. Hosting-infrastructure HHI (652) measures where the workloads actually run. Control-plane HHI (892) measures the combined ecosystem, and deliberately includes CDN, SaaS-builder and DNS-infrastructure actors alongside hosting groups.
Read as market power, Czechia runs on about 9.8 effective owners of the customer relationship; read as infrastructure, the same book spreads across about 15.3 effective hosting infrastructures — a 1.6× gap between who runs the servers and who holds the contract: the market is thinner at the contract than at the rack. Shares follow the same split: the top three owners hold 51.1% of customer relationships, while the top three infrastructures carry 35.1% of the workloads, and on the wider control plane — which also counts CDN, SaaS-builder and DNS actors — the top three come to 46.5%.
An entry price of €2.03/mo is a bid for the first transaction, not the cost of the service: at least 4 of the 8 tracked Czech storefronts acquire on teaser pricing, while storefronts serving 41.2% of captured relationships publish a renewal price. Czechia's openness is real — about 9.8 effective owners, none above 21.1% — and its advertised price still stops being true after twelve months.
All three readings are drawn from the .cz active-domains book (571,126 active domains) and are ownership-folded — a lower bound. Each reading is renormalised over its own actor set. How the bands and the three readings work.
Across the 249,842 active Czech business sites whose pages we measure and fingerprint: 15.6% carry e-commerce tooling, 54.7% run analytics, and 2.9% sit on a detected website builder. Off the web layer, 10.2% of the full Czech book runs modern hosted email.
Presence, not billing; the builder share is a floor. How technology detection works.
Of the 596,097 mail-carrying business domains, 62.3% publish SPF but only 30.6% do so with a spoof-rejecting hard fail. 35.6% publish DMARC — 2.5% with an enforcing p=reject, 23.6% monitoring-only p=none, both shares of the same mail-carrying book, so enforcement reaches 12.0% of it. Adoption is not enforcement. How to read email posture.
Across 8 tracked Czech storefronts, the median entry-tier price is €1.57/mo ex-VAT. Weight the same storefronts by how many businesses each platform actually serves and the price the average Czech customer meets is €2.03/mo — above the storefront median: among the storefronts we price, which together hold 17.3% of this market's hosting relationships, the larger platforms price above the field.
— a floor, since storefronts that never disclose a renewal price sit in the denominator.
Fewer than five tracked Czech storefronts publish a measurable renewal price, so we do not state a measured market renewal cliff — a median over three storefronts would be an anecdote, not a statistic. Storefronts serving only 41.2% of captured Czech customer relationships publish a renewal price — among the storefronts we price, which hold 17.3% of this market's hosting relationships, most customers cannot see year two before they commit. Weight the same storefronts by the customer relationships each serves and the cliff the average Czech customer meets is 1× — a figure that takes the flat-displaying market majority at its displayed word, since no published renewal exists to verify it.
The tracked set represents 67.8% of the Czech control-plane customer relationships. Price snapshot 2026-08-31; prices are captured on their own cadence. How prices are captured, normalised and suppressed.
Czech businesses search webhosting and domén, and the storefronts answer in Czech — registrace, služby, spolehlivý, zdarma. An English-only page competing on “hosting” arrives in a market that already has its own word for it.
Measured from Czech storefronts, sized by how many providers use each term.
The two terms buyers search most: webhosting / domén. How this is measured.
Every figure here is queryable through the HostingBrain connector, free tier. In Claude or any MCP-compatible assistant, this is the whole page in one prompt:
“Using HostingBrain, describe the Czechia hosting market: how concentrated is it — give me the actor-pure hosting-relationship HHI and effective owners for market power, and the hosting-infrastructure and control-plane readings beside it, ownership-folded — how large is the active-domains book, what do businesses run (CMS / e-commerce / builder adoption), what does entry shared hosting cost and how steep are renewal cliffs, and what is the SPF/DMARC posture? Keep it aggregate-level.”
Ask the follow-up yourself. HostingBrain answers questions like this — with the date, denominator and caveats attached — inside Claude and any MCP-compatible assistant. Named provider shares and per-operator price ladders are on Pro.