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 · 371 ms

HostCertsFirst seenLast seenDNS
chapmanchoice.com 5 2026-02-04 2026-10-04 ok
*.chapmanchoice.com 1 2026-02-04 2026-02-04 —
outlook.chapmanchoice.com 2 2025-06-28 2026-06-29 ok
www.outlook.chapmanchoice.com 2 2025-06-28 2026-06-29 nxdomain
email.chapmanchoice.com 3 2025-07-07 2026-07-08 ok
www.email.chapmanchoice.com 3 2025-07-07 2026-07-08 nxdomain
www.chapmanchoice.com 4 2026-02-21 2026-10-05 ok

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