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.

6 hosts · 195 ms

HostCertsFirst seenLast seen
asossamplesale.com 12 2026-04-14 2026-10-04
mta-sts.asossamplesale.com 1 2026-01-27 2026-01-27
account.asossamplesale.com 5 2026-05-07 2026-09-11
eu.asossamplesale.com 5 2026-05-07 2026-09-04
account.eu.asossamplesale.com 5 2026-05-07 2026-09-03
www.asossamplesale.com 15 2026-04-14 2026-09-26

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