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.

7 hosts · 268 ms

HostCertsFirst seenLast seen
winnie.com 2 2026-02-06 2026-02-09
*.winnie.com 2 2026-02-06 2026-02-09
dd.winnie.com 5 2026-04-26 2026-09-23
api.cdp.winnie.com 1 2026-02-19 2026-02-19
evs.cdp.winnie.com 2 2026-02-19 2026-07-07
pages.winnie.com 8 2026-04-24 2026-08-20
support.winnie.com 6 2026-04-26 2026-08-19

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