~/dnsniffer/issuers/incommon·rank #99
▸ How many domains does InCommon secure?
673
active domains whose current TLS certificate was issued by InCommon, as of - 0.00% of all attributed domains.
# rank #99 of all CAs ▼ 7 in 30d# all records held: 677# subdomains: 0# intermediates: 1# United States
~/issuers/incommon/history·active domains
673
domains secured by InCommon on 2026-10-14 · ▼ -105 (-13.50%) since 2025-06-30
# y-axis starts at 654.16, 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
▼ -14.16%
-111 domains
90 days
▼ -18.92%
-157 domains
1 year
▼ -17.63%
-144 domains
# intermediate CAs
| intermediate | country | domains |
|---|---|---|
| InCommon RSA OV SSL CA 3 | United States | 673 |
# faq
- ? How many domains does InCommon secure?
- InCommon is the certificate authority for 673 active domains as of October 14, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
- ? Is InCommon gaining or losing market share?
- The number of domains secured by InCommon has shrunk by 17.63% over the last year (-144 domains).
- ? Which intermediate CAs does InCommon sign from?
- We have seen 1 intermediates under InCommon, the busiest being “InCommon RSA OV SSL CA 3” with 673 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.