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.

5 hosts · 256 ms

HostCertsFirst seenLast seen
preggers.app 19 2026-05-11 2026-10-01
*.preggers.app 10 2026-05-11 2026-10-01
onelink.preggers.app 10 2026-05-03 2026-08-29
content.preggers.app 6 2026-04-15 2026-09-22
www.preggers.app 6 2026-05-16 2026-09-11

Programmatic access: API GET /v1/hosts/preggers.app (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/preggers.app.