Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

27 hosts · 283 ms

HostCertsFirst seenLast seenDNS
humanesociety.org 4 2026-04-20 2026-08-18 ok
secured.humanesociety.org 16 2026-06-01 2026-09-27 ok
www.secured.humanesociety.org 16 2026-05-31 2026-09-26 ok
store.humanesociety.org 2 2026-01-13 2026-06-11 ok
secure.humanesociety.org 5 2026-05-11 2026-09-24 ok
give.humanesociety.org 16 2026-05-10 2026-09-06 ok
www.give.humanesociety.org 16 2026-05-09 2026-09-04 ok
blog.humanesociety.org 18 2026-05-01 2026-08-27 ok
new.blog.humanesociety.org 16 2026-05-05 2026-09-01 ok
www.blog.humanesociety.org 18 2026-04-27 2026-08-24 ok
mi.humanesociety.org 3 2026-06-02 2026-08-15 ok
roi.humanesociety.org 1 2026-01-18 2026-01-18 ok
work.humanesociety.org 2 2026-01-18 2026-06-12 ok
pressportal.humanesociety.org 3 2026-05-21 2026-10-03 ok
newsroom.humanesociety.org 4 2026-04-08 2026-08-09 ok
gtm.humanesociety.org 4 2026-04-09 2026-09-20 ok
action.humanesociety.org 5 2026-05-11 2026-09-24 ok
video.humanesociety.org 2 2026-01-18 2026-06-12 ok
convio.humanesociety.org 1 2026-01-13 2026-01-13 —
protectseals.humanesociety.org 1 2026-01-13 2026-01-13 ok
videos.humanesociety.org 2 2026-01-13 2026-06-10 ok
volunteers.humanesociety.org 7 2025-06-18 2026-09-02 ok
slideshows.humanesociety.org 1 2026-01-18 2026-01-18 ok
morethanapet.humanesociety.org 4 2026-05-17 2026-09-10 ok
photocontest.humanesociety.org 1 2026-01-13 2026-01-13 ok
www.humanesociety.org 4 2026-04-20 2026-08-18 ok
legacy.humanesociety.org 8 2026-04-20 2026-09-25 ok

Programmatic access, with DNS A records: API GET /v1/hosts/humanesociety.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/humanesociety.org.