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.

9 hosts · 266 ms

HostCertsFirst seenLast seen
thesca.org 8 2026-04-30 2026-09-18
board.thesca.org 5 2026-04-30 2026-08-28
cloud.e.thesca.org 1 2026-02-16 2026-02-16
image.e.thesca.org 3 2026-01-07 2026-01-16
click.e.thesca.org 1 2026-02-16 2026-02-16
view.e.thesca.org 1 2026-02-16 2026-02-16
secure.thesca.org 1 2025-10-15 2025-10-15
intranet.thesca.org 5 2026-05-01 2026-08-29
www.thesca.org 6 2026-04-30 2026-08-17

Programmatic access: API GET /v1/hosts/thesca.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/thesca.org.