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 · 221 ms

HostCertsFirst seenLast seen
spocket.co 9 2025-08-03 2026-09-23
*.spocket.co 10 2025-08-03 2026-09-23
site.spocket.co 8 2026-05-03 2026-08-29
jobs.spocket.co 4 2026-04-20 2026-08-18
get.spocket.co 20 2026-05-22 2026-09-17
migration-test.spocket.co 2 2026-09-18 2026-09-18
academy.spocket.co 8 2026-05-06 2026-09-01

Programmatic access: API GET /v1/hosts/spocket.co (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/spocket.co.