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

Download CSV
HostCertsFirst seenLast seen
reserveps.com 26 2025-08-08 2026-09-17
*.reserveps.com 8 2026-05-22 2026-09-17
helpdesk.reserveps.com 12 2026-06-03 2026-09-29
hello.reserveps.com 10 2026-05-07 2026-09-03
membership.reserveps.com 10 2026-05-06 2026-09-02
www.reserveps.com 16 2026-04-30 2026-08-26

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