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~/dnsniffer/issuers/sectigo·rank #5

▸ How many domains does Sectigo secure?

5,605,162

active domains whose current TLS certificate was issued by Sectigo, as of - 2.36% of all attributed domains.

# rank #5 of all CAs# all records held: 6,077,127# subdomains: 27,953# intermediates: 23# United Kingdom
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~/issuers/sectigo/history·active domains
5,605,162
domains secured by Sectigo on 2026-10-15 · ▲ +4,224,621 (+306.01%) since 2025-06-30
873.6K2.18M3.49M4.80M6.11M2025-06-30: 1,380,541 active2025-07-31: 4,090,227 active2025-08-31: 4,127,890 active2025-09-30: 4,132,031 active2025-10-31: 4,132,031 active2025-11-30: 4,132,031 active2025-12-31: 4,637,609 active2026-01-31: 4,807,950 active2026-02-28: 4,807,950 active2026-03-31: 4,807,950 active2026-04-30: 5,257,334 active2026-05-31: 5,408,799 active2026-06-30: 5,501,435 active2026-07-31: 5,563,697 active2026-08-31: 5,563,665 active2026-09-01: 5,563,049 active2026-09-02: 5,566,191 active2026-09-03: 5,300,114 active2026-09-04: 5,253,017 active2026-09-05: 5,260,244 active2026-09-06: 5,264,783 active2026-09-07: 5,268,110 active2026-09-08: 5,277,667 active2026-09-09: 5,285,718 active2026-09-10: 5,293,461 active2026-09-11: 5,298,342 active2026-09-12: 5,305,353 active2026-09-13: 5,306,360 active2026-09-14: 5,310,447 active2026-09-15: 5,313,648 active2026-09-16: 5,321,987 active2026-09-17: 5,335,599 active2026-09-18: 5,356,004 active2026-09-19: 5,358,159 active2026-09-20: 5,360,541 active2026-09-21: 5,363,361 active2026-09-22: 5,364,646 active2026-09-23: 5,372,937 active2026-09-24: 5,568,065 active2026-09-25: 5,584,664 active2026-09-26: 5,586,639 active2026-09-27: 5,585,130 active2026-09-28: 5,583,884 active2026-09-29: 5,585,002 active2026-09-30: 5,585,699 active2026-10-01: 5,586,739 active2026-10-02: 5,585,938 active2026-10-03: 5,584,667 active2026-10-04: 5,581,326 active2026-10-05: 5,578,405 active2026-10-06: 5,581,267 active2026-10-07: 5,582,841 active2026-10-08: 5,584,673 active2026-10-09: 5,585,586 active2026-10-10: 5,585,988 active2026-10-11: 5,587,634 active2026-10-12: 5,587,464 active2026-10-13: 5,591,120 active2026-10-14: 5,593,944 active2026-10-15: 5,605,162 active2025-06-302026-10-15

# y-axis starts at 873.6K, 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
▲ +5.49%
+291,514 domains
90 days
▲ +1.89%
+103,727 domains
1 year
▲ +35.65%
+1,473,131 domains
# intermediate CAs
Intermediate certificate authorities operating under Sectigo, with the number of active domains each currently secures.
intermediatecountrydomains
Sectigo Public Server Authentication CA DV R36-4,765,184
Sectigo RSA Domain Validation Secure Server CAUnited Kingdom832,438
Sectigo RSA Organization Validation Secure Server CAUnited Kingdom6,357
Sectigo RSA Extended Validation Secure Server CAUnited Kingdom674
COMODO RSA Organization Validation Secure Server CAUnited Kingdom367
Sectigo Public Server Authentication CA EV R40United Kingdom83
Sectigo Public Server Authentication CA DV R40United Kingdom30
Sectigo Public Server Authentication CA DV R35United Kingdom13
Sectigo Public Server Authentication CA OV R35United Kingdom6
COMODO RSA Domain Validation Secure Server CAUnited Kingdom5
COMODO RSA Extended Validation Secure Server CAUnited Kingdom4
Sectigo SHA-256 OV Secure Server CA 2United Kingdom1
Sectigo SHA-256 EV Secure Server CAUnited Kingdom0
COMODO RSA Domain Validation Secure Server CA 2United Kingdom0
Sectigo CN Public Server Authentication CA DV R31United Kingdom0
Sectigo SHA-256 DV Secure Server CA 2United Kingdom0
Sectigo CN Public Server Authentication CA OV R31United Kingdom0
Sectigo CN Public Server Authentication CA EV R31United Kingdom0
Sectigo SHA-256 OV Secure Server CAUnited Kingdom0
Sectigo Public Server Authentication CA EV R35United Kingdom0
Sectigo SHA-256 DV Secure Server CAUnited Kingdom0
Sectigo RSA Pro Series Secure Server CAUnited Kingdom0
Sectigo SHA-256 EV Secure Server CA 2United Kingdom0
# faq
? How many domains does Sectigo secure?
Sectigo is the certificate authority for 5,605,162 active domains as of October 15, 2026 - 2.36% of every domain DNSniffer can attribute to an issuer.
? Is Sectigo gaining or losing market share?
The number of domains secured by Sectigo has grown by 35.65% over the last year (+1,473,131 domains).
? Which intermediate CAs does Sectigo sign from?
We have seen 23 intermediates under Sectigo, the busiest being “Sectigo Public Server Authentication CA DV R36” with 4,765,184 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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