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.

12 hosts · 227 ms

HostCertsFirst seenLast seen
ownwell.com 3 2026-06-12 2026-08-14
brookfield.ownwell.com 1 2026-06-24 2026-06-24
ocre.ownwell.com 1 2026-08-28 2026-08-28
merch.ownwell.com 13 2026-04-12 2026-09-25
api.ownwell.com 2 2025-11-02 2026-08-28
emclick.ownwell.com 2 2026-03-05 2026-07-21
managewell.ownwell.com 1 2026-08-28 2026-08-28
ftp.ownwell.com 5 2026-05-08 2026-09-05
transfer.ownwell.com 3 2026-06-04 2026-09-02
partner.ownwell.com 5 2026-04-27 2026-08-29
www.ownwell.com 3 2026-06-10 2026-08-12
sandbox.ownwell.com 5 2026-05-14 2026-09-15

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