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~/dnsniffer/issuers/secom-trust-systems·rank #69

▸ How many domains does SECOM Trust Systems secure?

2,458

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

# rank #69 of all CAs ▼ 6 in 30d# all records held: 2,697# subdomains: 3,961# intermediates: 10# Japan
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~/issuers/secom-trust-systems/history·active domains
2,458
domains secured by SECOM Trust Systems on 2026-10-15 · ▲ +1,101 (+81.13%) since 2025-06-30
1.2K1.7K2.2K2.6K3.1K2025-06-30: 1,357 active2025-07-31: 2,880 active2025-08-31: 2,880 active2025-09-30: 2,880 active2025-10-31: 2,880 active2025-11-30: 2,880 active2025-12-31: 2,928 active2026-01-31: 2,940 active2026-02-28: 2,940 active2026-03-31: 2,940 active2026-04-30: 2,943 active2026-05-31: 2,943 active2026-06-30: 2,943 active2026-07-31: 2,943 active2026-08-31: 2,942 active2026-09-01: 2,932 active2026-09-02: 2,904 active2026-09-03: 2,826 active2026-09-04: 2,659 active2026-09-05: 2,639 active2026-09-06: 2,628 active2026-09-07: 2,622 active2026-09-08: 2,623 active2026-09-09: 2,622 active2026-09-10: 2,620 active2026-09-11: 2,609 active2026-09-12: 2,588 active2026-09-13: 2,583 active2026-09-14: 2,579 active2026-09-15: 2,567 active2026-09-16: 2,536 active2026-09-17: 2,524 active2026-09-18: 2,510 active2026-09-19: 2,501 active2026-09-20: 2,490 active2026-09-21: 2,493 active2026-09-22: 2,483 active2026-09-23: 2,469 active2026-09-24: 2,721 active2026-09-25: 2,698 active2026-09-26: 2,677 active2026-09-27: 2,670 active2026-09-28: 2,672 active2026-09-29: 2,654 active2026-09-30: 2,626 active2026-10-01: 2,601 active2026-10-02: 2,604 active2026-10-03: 2,586 active2026-10-04: 2,573 active2026-10-05: 2,568 active2026-10-06: 2,544 active2026-10-07: 2,533 active2026-10-08: 2,528 active2026-10-09: 2,516 active2026-10-10: 2,495 active2026-10-11: 2,485 active2026-10-12: 2,475 active2026-10-13: 2,470 active2026-10-14: 2,468 active2026-10-15: 2,458 active2025-06-302026-10-15

# y-axis starts at 1.2K, 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
▼ -4.25%
-109 domains
90 days
▼ -16.48%
-485 domains
1 year
▼ -14.65%
-422 domains
# intermediate CAs
Intermediate certificate authorities operating under SECOM Trust Systems, with the number of active domains each currently secures.
intermediatecountrydomains
FujiSSL Public Validation Authority - G3Japan1,187
SECOM Passport for Web SR 3.0 CAJapan958
NII Open Domain CA - G8 RSAJapan259
SECOM Passport for Web EV 2.0 CAJapan37
NII Open Domain CA - G7 RSAJapan10
CrossTrust OV CA5Japan4
NII Open Domain CA - G8 ECCJapan3
Subordinate Advanced CA G2Japan0
CrossTrust DV CA5Japan0
NII Open Domain CA - G7 ECCJapan0
# faq
? How many domains does SECOM Trust Systems secure?
SECOM Trust Systems is the certificate authority for 2,458 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
? Is SECOM Trust Systems gaining or losing market share?
The number of domains secured by SECOM Trust Systems has shrunk by 14.65% over the last year (-422 domains).
? Which intermediate CAs does SECOM Trust Systems sign from?
We have seen 10 intermediates under SECOM Trust Systems, the busiest being “FujiSSL Public Validation Authority - G3” with 1,187 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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