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.

8 hosts · 193 ms

HostCertsFirst seenLast seen
firstfidelityreserve.com 1 2026-01-19 2026-01-19
server.firstfidelityreserve.com 1 2025-07-13 2025-07-13
www.server.firstfidelityreserve.com 1 2025-07-13 2025-07-13
emails.firstfidelityreserve.com 1 2026-06-04 2026-06-04
www.emails.firstfidelityreserve.com 1 2026-06-04 2026-06-04
dev.firstfidelityreserve.com 1 2026-05-13 2026-05-13
www.dev.firstfidelityreserve.com 1 2026-05-13 2026-05-13
www.firstfidelityreserve.com 1 2026-01-19 2026-01-19

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