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.

8 hosts · 235 ms

HostCertsFirst seenLast seen
facio.com 3 2025-07-06 2026-06-06
*.facio.com 5 2025-07-06 2026-08-29
ajuda.facio.com 4 2026-02-25 2026-10-01
*.sec.facio.com 3 2026-03-24 2026-08-24
site.facio.com 10 2026-04-24 2026-08-20
of-api.facio.com 2 2025-09-29 2026-08-30
r.facio.com 2 2026-03-26 2026-08-26
*.sandbox.facio.com 2 2026-04-26 2026-09-26

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