~/dnsniffer/issuers/serpro·rank #187
▸ How many domains does SERPRO secure?
11
active domains whose current TLS certificate was issued by SERPRO, as of - 0.00% of all attributed domains.
# rank #187 of all CAs ▼ 2 in 30d# all records held: 18# subdomains: 0# intermediates: 1# Brazil
~/issuers/serpro/history·active domains
11
domains secured by SERPRO on 2026-10-15 · ▼ -8 (-42.11%) since 2025-07-31
# y-axis starts at 8.8, 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
▲ +10.00%
+1 domains
90 days
▼ -45.00%
-9 domains
1 year
▼ -42.11%
-8 domains
# intermediate CAs
| intermediate | country | domains |
|---|---|---|
| Autoridade Certificadora do SERPRO SSLv1 | Brazil | 11 |
# faq
- ? How many domains does SERPRO secure?
- SERPRO is the certificate authority for 11 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
- ? Is SERPRO gaining or losing market share?
- The number of domains secured by SERPRO has shrunk by 42.11% over the last year (-8 domains).
- ? Which intermediate CAs does SERPRO sign from?
- We have seen 1 intermediates under SERPRO, the busiest being “Autoridade Certificadora do SERPRO SSLv1” with 11 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.