~/dnsniffer/issuers/japan-registry-services-co·rank #24
$ dnsniffer count --issuer japan-registry-services-co --active
▸ How many domains does Japan Registry Services Co secure?
32,109
active domains whose current TLS certificate was issued by Japan Registry Services Co, as of — 0.01% of all attributed domains.
# rank #24 of all CAs# all records held: 33,356# subdomains: 3,425# intermediates: 2# Japan
~/issuers/japan-registry-services-co/history·active domains
32,109
domains secured by Japan Registry Services Co on 2026-08-31 · ▲ +17,396 (+118.24%) since 2025-06-30
# y-axis starts at 13K, 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
▲ +0.00%
+0 domains
90 days
▲ +0.00%
+0 domains
1 year
▲ +7.34%
+2,196 domains
# intermediate CAs
| intermediate | country | domains |
|---|---|---|
| JPRS Domain Validation Authority - G4 | Japan | 30,832 |
| JPRS Organization Validation Authority - G4 | Japan | 1,277 |
# faq
- ? How many domains does Japan Registry Services Co secure?
- Japan Registry Services Co is the certificate authority for 32,109 active domains as of August 31, 2026 — 0.01% of every domain DNSniffer can attribute to an issuer.
- ? Is Japan Registry Services Co gaining or losing market share?
- The number of domains secured by Japan Registry Services Co has grown by 7.34% over the last year (+2,196 domains).
- ? Which intermediate CAs does Japan Registry Services Co sign from?
- We have seen 2 intermediates under Japan Registry Services Co, the busiest being “JPRS Domain Validation Authority - G4” with 30,832 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.