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 · 347 ms

HostCertsFirst seenLast seen
puppyspot.com 19 2026-02-17 2026-09-20
*.puppyspot.com 19 2026-02-17 2026-09-20
mail.puppyspot.com 10 2026-04-28 2026-08-25
image.email.puppyspot.com 2 2026-05-22 2026-05-22
help.puppyspot.com 1 2026-01-08 2026-01-08
shop.puppyspot.com 15 2026-05-27 2026-10-07
account.puppyspot.com 15 2026-05-13 2026-09-21
*.gw.puppyspot.com 1 2026-09-03 2026-09-03

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