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 · 267 ms

HostCertsFirst seenLast seen
plannedparenthoodaction.org 20 2026-05-06 2026-10-06
*.plannedparenthoodaction.org 18 2026-05-14 2026-09-16
fundraise.plannedparenthoodaction.org 10 2026-05-24 2026-09-19
actioncouncils.plannedparenthoodaction.org 16 2026-04-24 2026-08-20
events.plannedparenthoodaction.org 16 2026-04-24 2026-08-20
act.plannedparenthoodaction.org 16 2026-04-24 2026-08-21

Programmatic access: API GET /v1/hosts/plannedparenthoodaction.org (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/plannedparenthoodaction.org.