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~/dnsniffer/issuers/secom-trust-systems-co·rank #76

▸ How many domains does SECOM Trust Systems Co secure?

1,884

active domains whose current TLS certificate was issued by SECOM Trust Systems Co, as of - 0.00% of all attributed domains.

# rank #76 of all CAs ▲ 4 in 30d# all records held: 1,885# subdomains: 0# intermediates: 2# Japan
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~/issuers/secom-trust-systems-co/history·active domains
1,884
domains secured by SECOM Trust Systems Co on 2026-10-15 · ▲ +1,234 (+189.85%) since 2025-06-30
501.92884.461.3K1.6K2.0K2025-06-30: 650 active2025-07-31: 1,247 active2025-08-31: 1,248 active2025-09-30: 1,248 active2025-10-31: 1,248 active2025-11-30: 1,248 active2025-12-31: 1,252 active2026-01-31: 1,256 active2026-02-28: 1,256 active2026-03-31: 1,256 active2026-04-30: 1,282 active2026-05-31: 1,290 active2026-06-30: 1,301 active2026-07-31: 1,318 active2026-08-31: 1,319 active2026-09-01: 1,322 active2026-09-02: 1,332 active2026-09-03: 1,354 active2026-09-04: 1,360 active2026-09-05: 1,362 active2026-09-06: 1,356 active2026-09-07: 1,378 active2026-09-08: 1,387 active2026-09-09: 1,391 active2026-09-10: 1,393 active2026-09-11: 1,405 active2026-09-12: 1,401 active2026-09-13: 1,397 active2026-09-14: 1,402 active2026-09-15: 1,433 active2026-09-16: 1,483 active2026-09-17: 1,485 active2026-09-18: 1,508 active2026-09-19: 1,517 active2026-09-20: 1,514 active2026-09-21: 1,513 active2026-09-22: 1,506 active2026-09-23: 1,501 active2026-09-24: 1,507 active2026-09-25: 1,546 active2026-09-26: 1,549 active2026-09-27: 1,541 active2026-09-28: 1,537 active2026-09-29: 1,578 active2026-09-30: 1,604 active2026-10-01: 1,628 active2026-10-02: 1,643 active2026-10-03: 1,666 active2026-10-04: 1,654 active2026-10-05: 1,657 active2026-10-06: 1,683 active2026-10-07: 1,714 active2026-10-08: 1,760 active2026-10-09: 1,788 active2026-10-10: 1,812 active2026-10-11: 1,803 active2026-10-12: 1,785 active2026-10-13: 1,809 active2026-10-14: 1,863 active2026-10-15: 1,884 active2025-06-302026-10-15

# y-axis starts at 501.92, 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
▲ +31.47%
+451 domains
90 days
▲ +44.81%
+583 domains
1 year
▲ +50.96%
+636 domains
# intermediate CAs
Intermediate certificate authorities operating under SECOM Trust Systems Co, with the number of active domains each currently secures.
intermediatecountrydomains
SECOM Passport for Web OV RSA CA 2024Japan1,763
SECOM Passport for Web EV RSA CA 2024Japan121
# faq
? How many domains does SECOM Trust Systems Co secure?
SECOM Trust Systems Co is the certificate authority for 1,884 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
? Is SECOM Trust Systems Co gaining or losing market share?
The number of domains secured by SECOM Trust Systems Co has grown by 50.96% over the last year (+636 domains).
? Which intermediate CAs does SECOM Trust Systems Co sign from?
We have seen 2 intermediates under SECOM Trust Systems Co, the busiest being “SECOM Passport for Web OV RSA CA 2024” with 1,763 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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