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.

7 hosts · 346 ms

HostCertsFirst seenLast seenDNS
theanimalrescuesite.com 46 2026-05-21 2026-10-02 ok
*.theanimalrescuesite.com 30 2026-05-21 2026-09-26 —
trk.b.theanimalrescuesite.com 14 2026-05-21 2026-09-16 ok
sli.theanimalrescuesite.com 2 2026-03-06 2026-08-06 ok
link.theanimalrescuesite.com 16 2026-05-20 2026-09-15 ok
reports.theanimalrescuesite.com 7 2026-05-29 2026-09-27 ok
test.theanimalrescuesite.com 13 2026-05-24 2026-10-04 ok

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