~/dnsniffer/issuers/f5·rank #48
▸ How many domains does F5 secure?
4,484
active domains whose current TLS certificate was issued by F5, as of - 0.00% of all attributed domains.
# rank #48 of all CAs ▲ 23 in 30d# all records held: 4,490# subdomains: 0# intermediates: 1# United States
~/issuers/f5/history·active domains
4,484
domains secured by F5 on 2026-10-15 · ▲ +3,072 (+217.56%) since 2025-06-30
# y-axis starts at 1.0K, 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
▲ +97.88%
+2,218 domains
90 days
▲ +130.42%
+2,538 domains
1 year
▲ +136.12%
+2,585 domains
# intermediate CAs
| intermediate | country | domains |
|---|---|---|
| Sectigo Public Server Authentication CA OV R40 | United States | 4,484 |
# faq
- ? How many domains does F5 secure?
- F5 is the certificate authority for 4,484 active domains as of October 15, 2026 - 0.00% of every domain DNSniffer can attribute to an issuer.
- ? Is F5 gaining or losing market share?
- The number of domains secured by F5 has grown by 136.12% over the last year (+2,585 domains).
- ? Which intermediate CAs does F5 sign from?
- We have seen 1 intermediates under F5, the busiest being “Sectigo Public Server Authentication CA OV R40” with 4,484 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.