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.

14 hosts · 258 ms

HostCertsFirst seenLast seen
defenage.com 14 2026-04-25 2026-08-31
*.defenage.com 14 2026-04-25 2026-08-31
tracking.defenage.com 20 2026-05-25 2026-09-20
register.defenage.com 10 2026-05-06 2026-09-03
discover.defenage.com 1 2026-09-29 2026-09-29
forms.defenage.com 10 2026-05-06 2026-09-04
returns.defenage.com 16 2026-05-21 2026-09-17
events.defenage.com 8 2026-06-12 2026-10-10
connect.defenage.com 14 2026-04-23 2026-08-26
meet.defenage.com 10 2026-05-11 2026-09-08
support.defenage.com 10 2026-05-07 2026-09-04
professionalsupport.defenage.com 10 2026-05-17 2026-09-14
assist.defenage.com 12 2026-06-02 2026-10-01
uqbcv.defenage.com 6 2026-05-02 2026-08-28

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