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.

5 hosts · 204 ms

HostCertsFirst seenLast seen
puursmile.com 17 2026-05-31 2026-10-10
article.puursmile.com 1 2025-11-12 2025-11-12
offer.puursmile.com 1 2026-02-09 2026-02-09
t.puursmile.com 5 2026-05-11 2026-09-08
www.puursmile.com 15 2026-05-31 2026-10-09

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