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.

7 hosts · 306 ms

HostCertsFirst seenLast seen
docresponse.com 7 2026-04-02 2026-09-09
*.docresponse.com 3 2026-02-01 2026-09-02
staging2.docresponse.com 4 2026-06-14 2026-10-12
athena.docresponse.com 4 2026-04-18 2026-08-17
test.docresponse.com 5 2026-04-22 2026-08-20
www.docresponse.com 5 2026-05-12 2026-09-09
ux.docresponse.com 4 2026-04-21 2026-08-18

Programmatic access: API GET /v1/hosts/docresponse.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/docresponse.com.