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.

10 hosts · 194 ms

HostCertsFirst seenLast seen
rapisardi.com 1 2025-06-17 2025-06-17
oidc.rapisardi.com 1 2026-09-18 2026-09-18
mail.rapisardi.com 3 2026-06-09 2026-08-09
www.mail.rapisardi.com 1 2026-06-09 2026-06-09
smtp.rapisardi.com 13 2026-06-06 2026-10-06
das.rapisardi.com 1 2026-09-18 2026-09-18
mobile-aws.rapisardi.com 6 2026-04-17 2026-08-20
extranet-aws.rapisardi.com 1 2026-03-12 2026-03-12
meet.rapisardi.com 1 2025-09-12 2025-09-12
www.rapisardi.com 4 2025-06-17 2026-08-19

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