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~/dnsniffer/issuers/prvn-certifika-n-autorita·rank #177

▸ How many domains does První certifikační autorita secure?

20

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

# rank #177 of all CAs ▼ 4 in 30d# all records held: 20# subdomains: 8# intermediates: 2# Czechia
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~/issuers/prvn-certifika-n-autorita/history·active domains
20
domains secured by První certifikační autorita on 2026-10-15 · ▲ +17 (+566.67%) since 2025-06-30
0.66.81319.225.42025-06-30: 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 active2026-09-01: 13 active2026-09-02: 13 active2026-09-03: 14 active2026-09-04: 14 active2026-09-05: 14 active2026-09-06: 14 active2026-09-07: 14 active2026-09-08: 14 active2026-09-09: 14 active2026-09-10: 14 active2026-09-11: 14 active2026-09-12: 14 active2026-09-13: 14 active2026-09-14: 14 active2026-09-15: 15 active2026-09-16: 16 active2026-09-17: 16 active2026-09-18: 15 active2026-09-19: 17 active2026-09-20: 17 active2026-09-21: 17 active2026-09-22: 19 active2026-09-23: 21 active2026-09-24: 23 active2026-09-25: 23 active2026-09-26: 23 active2026-09-27: 22 active2026-09-28: 20 active2026-09-29: 17 active2026-09-30: 16 active2026-10-01: 15 active2026-10-02: 17 active2026-10-03: 18 active2026-10-04: 18 active2026-10-05: 18 active2026-10-06: 19 active2026-10-07: 20 active2026-10-08: 21 active2026-10-09: 20 active2026-10-10: 18 active2026-10-11: 18 active2026-10-12: 18 active2026-10-13: 19 active2026-10-14: 21 active2026-10-15: 20 active2025-06-302026-10-15

# y-axis starts at 0.6, 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
▲ +33.33%
+5 domains
90 days
▲ +53.85%
+7 domains
1 year
▲ +81.82%
+9 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 06/2022Czechia16
I.CA TLS EV CA/RSA 06/2022Czechia4
# faq
? How many domains does První certifikační autorita secure?
První certifikační autorita is the certificate authority for 20 active domains as of October 15, 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 81.82% over the last year (+9 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 16 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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