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.

13 hosts · 301 ms

HostCertsFirst seenLast seenDNS
hearinglife.com 8 2025-07-08 2026-09-29 ok
media.hearinglife.com 3 2026-06-14 2026-08-21 ok
web.hearinglife.com 1 2025-10-02 2025-10-02 ok
www.web.hearinglife.com 1 2025-10-02 2025-10-02 nxdomain
email.hearinglife.com 1 2026-01-08 2026-01-08 ok
link.email.hearinglife.com 1 2026-01-08 2026-01-08 ok
www.link.email.hearinglife.com 1 2026-01-08 2026-01-08 nxdomain
www.email.hearinglife.com 1 2026-01-08 2026-01-08 nxdomain
waystar.hearinglife.com 2 2025-08-14 2026-07-20 ok
www.waystar.hearinglife.com 2 2025-08-14 2026-07-20 nxdomain
cdweb-us.hearinglife.com 3 2026-04-13 2026-09-28 ok
www.hearinglife.com 5 2025-07-08 2026-07-02 ok
my.hearinglife.com 2 2026-10-05 2026-10-07 ok

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