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~/dnsniffer/issuers/prvn-certifika-n-autorita·rank #181
$ dnsniffer count --issuer prvn-certifika-n-autorita --active

▸ How many domains does První certifikační autorita secure?

13

active domains whose current TLS certificate was issued by První certifikační autorita, as of — 0.00% of all attributed domains.

# rank #181 of all CAs# all records held: 13# subdomains: 8# intermediates: 2# Czechia
search domains download the certificate dataset
~/issuers/prvn-certifika-n-autorita/history·active domains
13
domains secured by První certifikační autorita on 2026-08-31 · ▲ +10 (+333.33%) since 2025-06-30
1.84.89999999999999957.99999999999999911.114.22025-06-30: 3 active2025-07-31: 11 active2025-08-31: 11 active2025-09-30: 11 active2025-10-31: 11 active2025-11-30: 11 active2025-12-31: 13 active2026-01-31: 13 active2026-02-28: 13 active2026-03-31: 13 active2026-04-30: 13 active2026-05-31: 13 active2026-06-30: 13 active2026-07-31: 13 active2026-08-31: 13 active2025-06-302026-08-31

# y-axis starts at 1.8, not zero — domain counts move by fractions of a percent a day. Dashed segments are estimated: reconstructed from certificate first-seen dates before daily snapshots began, not measured on the day.

# change over time
30 days
▲ +0.00%
+0 domains
90 days
▲ +0.00%
+0 domains
1 year
▲ +18.18%
+2 domains
# intermediate CAs
Intermediate certificate authorities operating under První certifikační autorita, with the number of active domains each currently secures.
intermediatecountrydomains
I.CA TLS DV/OV CA/RSA 06/2022Czechia12
I.CA TLS EV CA/RSA 06/2022Czechia1
# faq
? How many domains does První certifikační autorita secure?
První certifikační autorita is the certificate authority for 13 active domains as of August 31, 2026 — 0.00% of every domain DNSniffer can attribute to an issuer.
? Is První certifikační autorita gaining or losing market share?
The number of domains secured by První certifikační autorita has grown by 18.18% over the last year (+2 domains).
? Which intermediate CAs does První certifikační autorita sign from?
We have seen 2 intermediates under První certifikační autorita, the busiest being “I.CA TLS DV/OV CA/RSA 06/2022” with 12 domains. The full list, with per-intermediate counts, is on this page.
? Where does this number come from?
DNSniffer ingests Certificate Transparency logs continuously and records the issuer of the most recent certificate seen for each domain, then snapshots the per-issuer count once a day. It measures how much of the live web a CA currently secures, not how many certificates it has issued over its lifetime.
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