Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

25 hosts · 243 ms

HostCertsFirst seenLast seen
activefence.com 51 2025-11-25 2026-10-01
*.activefence.com 47 2025-08-09 2026-10-01
eu-central-1.activefence.com 1 2025-06-24 2025-06-24
*.eu-central-1.activefence.com 15 2025-06-24 2026-09-06
*.production-eu-central-1-eks.eu-central-1.activefence.com 15 2025-06-24 2026-09-06
*.us-east-1.activefence.com 10 2026-04-23 2026-08-19
*.production-eks.us-east-1.activefence.com 10 2026-04-23 2026-08-19
*.production-us-west-2-eks.us-west-2.activefence.com 12 2026-05-13 2026-09-08
*.app.production-us-west-2-eks.us-west-2.activefence.com 12 2026-05-13 2026-09-08
*.ctf.re.activefence.com 12 2025-12-02 2026-09-23
*.dev.ctf.re.activefence.com 1 2026-02-15 2026-02-15
stagesite.activefence.com 14 2026-04-18 2026-08-14
devsite.activefence.com 12 2026-04-17 2026-08-13
engineering.activefence.com 12 2026-04-17 2026-08-13
ck.activefence.com 8 2026-04-19 2026-08-15
hello.activefence.com 3 2026-04-17 2026-06-16
lp.activefence.com 2 2026-06-02 2026-06-02
*.app.activefence.com 15 2025-08-09 2026-08-28
simulator.activefence.com 5 2026-05-09 2026-09-06
www.simulator.activefence.com 6 2026-05-10 2026-09-07
links.activefence.com 5 2026-06-09 2026-10-07
*.eu.activefence.com 12 2026-05-12 2026-09-07
cleanview.activefence.com 3 2026-05-22 2026-08-06
www.cleanview.activefence.com 3 2026-05-22 2026-08-06
www.activefence.com 11 2026-04-18 2026-08-15

Programmatic access: API GET /v1/hosts/activefence.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/activefence.com.