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▸ How many domains does Gehirn secure?

81

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

# rank #141 of all CAs ▼ 6 in 30d# all records held: 82# subdomains: 0# intermediates: 6# Japan
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~/issuers/gehirn/history·active domains
81
domains secured by Gehirn on 2026-10-15 · ▲ +68 (+523.08%) since 2025-06-30
4.626.34869.791.42025-06-30: 13 active2025-07-31: 75 active2025-08-31: 75 active2025-09-30: 75 active2025-10-31: 75 active2025-11-30: 75 active2025-12-31: 80 active2026-01-31: 82 active2026-02-28: 82 active2026-03-31: 82 active2026-04-30: 82 active2026-05-31: 82 active2026-06-30: 82 active2026-07-31: 82 active2026-08-31: 82 active2026-09-01: 82 active2026-09-02: 82 active2026-09-03: 82 active2026-09-04: 82 active2026-09-05: 82 active2026-09-06: 82 active2026-09-07: 82 active2026-09-08: 82 active2026-09-09: 82 active2026-09-10: 82 active2026-09-11: 82 active2026-09-12: 82 active2026-09-13: 82 active2026-09-14: 82 active2026-09-15: 82 active2026-09-16: 82 active2026-09-17: 82 active2026-09-18: 82 active2026-09-19: 82 active2026-09-20: 82 active2026-09-21: 82 active2026-09-22: 82 active2026-09-23: 82 active2026-09-24: 82 active2026-09-25: 82 active2026-09-26: 83 active2026-09-27: 82 active2026-09-28: 82 active2026-09-29: 82 active2026-09-30: 81 active2026-10-01: 80 active2026-10-02: 80 active2026-10-03: 80 active2026-10-04: 80 active2026-10-05: 80 active2026-10-06: 80 active2026-10-07: 80 active2026-10-08: 80 active2026-10-09: 80 active2026-10-10: 80 active2026-10-11: 80 active2026-10-12: 80 active2026-10-13: 80 active2026-10-14: 80 active2026-10-15: 81 active2025-06-302026-10-15

# y-axis starts at 4.6, 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
▼ -1.22%
-1 domains
90 days
▼ -1.22%
-1 domains
1 year
▲ +8.00%
+6 domains
# intermediate CAs
Intermediate certificate authorities operating under Gehirn, with the number of active domains each currently secures.
intermediatecountrydomains
Gehirn RSA Domain Validation Secure Server CA 2Japan53
Gehirn RSA Organization Validation Secure Server CA 2Japan19
Gehirn RSA Extended Validation Secure Server CA 2Japan4
Gehirn Managed Certification Authority - RSA OVJapan3
Gehirn Managed Certification Authority - RSA EVJapan2
Gehirn Managed Certification Authority - RSA DVJapan0
# faq
? How many domains does Gehirn secure?
Gehirn is the certificate authority for 81 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
? Is Gehirn gaining or losing market share?
The number of domains secured by Gehirn has grown by 8.00% over the last year (+6 domains).
? Which intermediate CAs does Gehirn sign from?
We have seen 6 intermediates under Gehirn, the busiest being “Gehirn RSA Domain Validation Secure Server CA 2” with 53 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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