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 · 271 ms

Download CSV
HostCertsFirst seenLast seen
houseplant.com 15 2025-09-27 2026-10-04
*.houseplant.com 2 2025-09-26 2026-08-26
housegoods.houseplant.com 14 2026-05-23 2026-10-04
drops.houseplant.com 10 2026-05-30 2026-09-25
account.houseplant.com 1 2026-09-08 2026-09-08
www.houseplant.com 13 2026-05-26 2026-10-05
gloopy.houseplant.com 5 2026-05-29 2026-09-26

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