Check-Host.cc

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.

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.