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.

19 hosts · 304 ms

HostCertsFirst seenLast seenDNS
petsense.com 13 2026-05-15 2026-09-26 ok
m2.ea.petsense.com 2 2025-07-14 2026-06-14 ok
res2.ea.petsense.com 2 2025-07-14 2026-06-14 ok
t2.ea.petsense.com 2 2025-07-14 2026-06-14 ok
m3.ea.petsense.com 2 2025-07-14 2026-06-14 ok
res3.ea.petsense.com 2 2025-07-14 2026-06-14 ok
t3.ea.petsense.com 2 2025-07-14 2026-06-14 ok
m4.ea.petsense.com 2 2025-07-14 2026-06-14 ok
res4.ea.petsense.com 2 2025-07-14 2026-06-14 ok
t4.ea.petsense.com 2 2025-07-14 2026-06-14 ok
m.ea.petsense.com 2 2025-07-14 2026-06-14 ok
res.ea.petsense.com 2 2025-07-14 2026-06-14 ok
t.ea.petsense.com 2 2025-07-14 2026-06-14 ok
www.petsense.com 13 2026-05-16 2026-09-25 ok
ca.ez.petsense.com 4 2026-04-16 2026-08-14 ok
e.ez.petsense.com 5 2026-04-16 2026-08-14 ok
preferences.ez.petsense.com 11 2026-04-27 2026-08-23 ok
images.ez.petsense.com 3 2026-04-16 2026-09-16 ok
view.ez.petsense.com 3 2026-04-16 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/petsense.com (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/petsense.com.