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.

13 hosts · 258 ms

HostCertsFirst seenLast seen
thescla.org 6 2026-05-06 2026-09-01
update.thescla.org 1 2026-01-01 2026-01-01
*.update.thescla.org 1 2026-01-01 2026-01-01
info.thescla.org 10 2026-05-20 2026-09-16
shop.thescla.org 11 2026-05-30 2026-10-08
app.thescla.org 1 2026-01-07 2026-01-07
honor.thescla.org 1 2025-12-31 2025-12-31
*.honor.thescla.org 1 2025-12-31 2025-12-31
members.thescla.org 1 2026-02-18 2026-02-18
students.thescla.org 12 2026-06-05 2026-10-02
www.thescla.org 12 2026-05-06 2026-09-01
academy.thescla.org 1 2026-09-01 2026-09-01
*.academy.thescla.org 1 2026-09-01 2026-09-01

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