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 · 238 ms

HostCertsFirst seenLast seen
rapidssl.com 6 2026-05-27 2026-09-28
dcv.rapidssl.com 32 2026-05-27 2026-09-14
dev.rapidssl.com 10 2026-03-23 2026-09-29
aemclouddev.rapidssl.com 7 2026-05-27 2026-09-28
preview.rapidssl.com 7 2026-05-27 2026-09-28
www.rapidssl.com 11 2026-05-27 2026-09-28

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