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~/dnsniffer/issuers/japan-registry-services·rank #18

▸ How many domains does Japan Registry Services secure?

52,529

active domains whose current TLS certificate was issued by Japan Registry Services, as of - 0.02% of all attributed domains.

# rank #18 of all CAs# all records held: 52,546# subdomains: 0# intermediates: 2# Japan
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~/issuers/japan-registry-services/history·active domains
52,529
domains secured by Japan Registry Services on 2026-10-15 · ▲ +30,461 (+138.03%) since 2025-06-30
18.4K27.9K37.3K46.7K56.2K2025-06-30: 22,068 active2025-07-31: 37,046 active2025-08-31: 37,101 active2025-09-30: 37,101 active2025-10-31: 37,101 active2025-11-30: 37,101 active2025-12-31: 37,654 active2026-01-31: 37,956 active2026-02-28: 37,956 active2026-03-31: 37,956 active2026-04-30: 39,234 active2026-05-31: 39,654 active2026-06-30: 40,056 active2026-07-31: 40,404 active2026-08-31: 40,400 active2026-09-01: 41,539 active2026-09-02: 42,712 active2026-09-03: 44,696 active2026-09-04: 45,087 active2026-09-05: 45,229 active2026-09-06: 45,104 active2026-09-07: 45,042 active2026-09-08: 45,442 active2026-09-09: 45,695 active2026-09-10: 45,853 active2026-09-11: 46,115 active2026-09-12: 46,246 active2026-09-13: 46,221 active2026-09-14: 46,304 active2026-09-15: 46,523 active2026-09-16: 46,807 active2026-09-17: 47,173 active2026-09-18: 47,434 active2026-09-19: 47,564 active2026-09-20: 47,552 active2026-09-21: 47,550 active2026-09-22: 47,559 active2026-09-23: 47,541 active2026-09-24: 47,633 active2026-09-25: 47,857 active2026-09-26: 48,013 active2026-09-27: 47,993 active2026-09-28: 48,057 active2026-09-29: 48,426 active2026-09-30: 48,656 active2026-10-01: 49,454 active2026-10-02: 49,939 active2026-10-03: 50,167 active2026-10-04: 50,151 active2026-10-05: 51,008 active2026-10-06: 50,901 active2026-10-07: 51,111 active2026-10-08: 51,308 active2026-10-09: 51,595 active2026-10-10: 51,774 active2026-10-11: 51,767 active2026-10-12: 51,759 active2026-10-13: 51,879 active2026-10-14: 52,182 active2026-10-15: 52,529 active2025-06-302026-10-15

# y-axis starts at 18.4K, 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
▲ +12.91%
+6,006 domains
90 days
▲ +31.14%
+12,473 domains
1 year
▲ +41.58%
+15,428 domains
# intermediate CAs
Intermediate certificate authorities operating under Japan Registry Services, with the number of active domains each currently secures.
intermediatecountrydomains
JPRS DV RSA CA 2024 G1Japan51,257
JPRS OV RSA CA 2024 G1Japan1,272
# faq
? How many domains does Japan Registry Services secure?
Japan Registry Services is the certificate authority for 52,529 active domains as of October 15, 2026 - 0.02% of every domain DNSniffer can attribute to an issuer.
? Is Japan Registry Services gaining or losing market share?
The number of domains secured by Japan Registry Services has grown by 41.58% over the last year (+15,428 domains).
? Which intermediate CAs does Japan Registry Services sign from?
We have seen 2 intermediates under Japan Registry Services, the busiest being “JPRS DV RSA CA 2024 G1” with 51,257 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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