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.

4 hosts · 291 ms

HostCertsFirst seenLast seen
healifeco.com 21 2026-05-01 2026-09-13
*.healifeco.com 7 2026-05-17 2026-09-13
shop.healifeco.com 2 2025-07-31 2026-07-01
www.healifeco.com 11 2026-05-02 2026-09-11

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