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.

10 hosts · 261 ms

HostCertsFirst seenLast seenDNS
register.centerwellprimarycare.com 3 2025-09-15 2026-09-09 nxdomain
qa-register.centerwellprimarycare.com 6 2025-07-28 2026-08-18 ok
autodiscover.centerwellprimarycare.com 3 2026-06-05 2026-08-21 nxdomain
smetrics.centerwellprimarycare.com 6 2025-12-02 2026-09-12 ok
target.centerwellprimarycare.com 4 2025-12-02 2026-09-12 ok
www.centerwellprimarycare.com 6 2025-12-02 2026-09-17 ok
qa-www.centerwellprimarycare.com 9 2026-01-05 2026-10-01 ok
stg-www.centerwellprimarycare.com 5 2025-12-02 2026-09-12 ok
int-www.centerwellprimarycare.com 3 2026-06-07 2026-08-12 ok
dev-www.centerwellprimarycare.com 6 2026-01-05 2026-08-25 ok

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