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.

7 hosts · 277 ms

HostCertsFirst seenLast seen
ldextras.com 3 2026-02-14 2026-09-28
stage.service.ldextras.com 2 2026-03-24 2026-07-17
dev.service.ldextras.com 2 2026-03-24 2026-07-17
stage.ldextras.com 3 2026-02-18 2026-10-02
go.ldextras.com 5 2026-04-22 2026-09-07
dev.ldextras.com 3 2026-02-21 2026-10-05
www.ldextras.com 3 2026-02-18 2026-10-02

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