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.

14 hosts · 222 ms

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HostCertsFirst seenLast seen
hjweinberg.org 9 2025-06-24 2026-10-12
*.hjweinberg.org 2 2025-06-24 2026-06-25
hppsbc01.hjweinberg.org 5 2025-06-19 2026-07-07
www.hppsbc01.hjweinberg.org 4 2025-06-19 2026-06-25
mppsbc01.hjweinberg.org 5 2026-05-15 2026-07-09
www.mppsbc01.hjweinberg.org 3 2026-05-15 2026-07-06
thehub.hjweinberg.org 2 2026-02-05 2026-07-01
genetec.hjweinberg.org 1 2025-10-13 2025-10-13
www.genetec.hjweinberg.org 1 2025-10-13 2025-10-13
genetec.owingsmills.hjweinberg.org 1 2025-10-13 2025-10-13
events.hjweinberg.org 5 2026-05-23 2026-09-20
mta-sts.hjweinberg.org 2 2026-02-10 2026-07-05
genetec.honolulu.hjweinberg.org 1 2025-10-13 2025-10-13
www.hjweinberg.org 7 2025-07-18 2026-10-12

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