Top-Level Domain
.cz
Aggregated statistics for the top-level domain
Apex domains
—
we've enumerated
Subdomains seen
1,706,789
CT + DNS + brute
TLS certs
15,042
naming .cz
Hosting ASNs
—
distinct origins
Domain Distribution
Apex domains with the most known subdomains — large orgs, telecoms, hosters.
| Apex | Subdomains |
|---|---|
| alwyn.cz | 13,989 |
| vas-server.cz | 9,038 |
| zcu.cz | 5,241 |
| cuni.cz | 4,046 |
| jex.cz | 3,870 |
| sazkafts.cz | 3,623 |
| involve.cz | 3,274 |
| moraviamusicfest.cz | 2,604 |
| hobbs.cz | 2,592 |
| luciecapska.cz | 2,449 |
| upol.cz | 2,352 |
| wz.cz | 2,305 |
| museumofbricks.cz | 2,301 |
| fajnestromy.cz | 2,028 |
| hz.cz | 2,023 |
| cvut.cz | 1,953 |
| warnermusic.cz | 1,951 |
| name.cz | 1,805 |
| kvalitne.cz | 1,628 |
| ringier.cz | 1,558 |
| cas.cz | 1,547 |
| toprague.cz | 1,486 |
| centrumpece.cz | 1,482 |
| gov.cz | 1,471 |
| chcislunecnienergii.cz | 1,353 |
| borec.cz | 1,338 |
| muni.cz | 1,311 |
| mestovodnany.cz | 1,286 |
| hydroprojekt.cz | 1,274 |
| stejnarodina.cz | 1,204 |
| kadernictvi-lada.cz | 1,180 |
| vstupenky-online.cz | 1,157 |
| 02family.cz | 1,139 |
| puxdesign.cz | 1,095 |
| lekarna.cz | 1,082 |
| pionyr.cz | 1,078 |
| grafartwebpro.cz | 1,077 |
| autonabidka.cz | 1,054 |
| bakalari.cz | 1,045 |
| cm.cz | 1,012 |
| vshosting.cz | 1,000 |
| sezbnam.cz | 991 |
| donic.cz | 990 |
| chipita.cz | 967 |
| zmail.cz | 959 |
| isz.cz | 957 |
| yogaholic.cz | 932 |
| unas.cz | 925 |
| stg.cz | 910 |
| esports.cz | 910 |
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Let's Encrypt | 6,717 |
| DigiCert | 1,555 |
| YR1 | 888 |
| YR2 | 875 |
| YE2 | 572 |
| YE1 | 553 |
| Sectigo | 549 |
| Alpiro RSA DV SSL CA 2 | 527 |
| GEANT TLS RSA 1 | 388 |
| Amazon | 251 |
| ZeroSSL | 176 |
| GlobalSign | 123 |
| WR3 | 75 |
| Cloudflare | 64 |
| AlpiroSSL RSA DV CA | 53 |
Top Hosting ASNs
No hosting attribution yet
Forward-DNS crawler hasn't resolved enough .cz apexes to BGP-attributable IPs.
Tech-Stack Distribution
No Wappalyzer detections
Body-fetcher hasn't covered enough .cz sites yet for stack patterns to emerge.
Threat-intel hits
| Feed | Category | Domains |
|---|---|---|
| openphish | phishing | 2 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.