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 · 315 ms

HostCertsFirst seenLast seen
fireworks.com 15 2026-04-18 2026-09-18
*.fireworks.com 7 2026-04-25 2026-09-18
image.e.fireworks.com 2 2026-09-30 2026-10-03
click.e.fireworks.com 1 2026-09-30 2026-09-30
support.fireworks.com 1 2026-02-28 2026-02-28
checkout.fireworks.com 14 2026-04-14 2026-09-27
www.fireworks.com 15 2026-04-14 2026-09-27
privacy.fireworks.com 9 2026-05-09 2026-09-13

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