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.

10 hosts · 240 ms

HostCertsFirst seenLast seen
defenagepro.com 17 2026-04-22 2026-09-25
*.defenagepro.com 13 2026-04-22 2026-08-21
media.defenagepro.com 12 2026-05-08 2026-09-05
portal.defenagepro.com 19 2026-09-28 2026-10-06
innovation.defenagepro.com 4 2026-04-18 2026-09-17
learn.defenagepro.com 10 2026-05-16 2026-09-13
events.defenagepro.com 10 2026-05-22 2026-09-19
support.defenagepro.com 10 2026-05-28 2026-09-26
practicesupport.defenagepro.com 10 2026-05-16 2026-09-13
www.defenagepro.com 4 2026-06-08 2026-09-25

Programmatic access: API GET /v1/hosts/defenagepro.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/defenagepro.com.