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.

14 hosts · 241 ms

HostCertsFirst seenLast seenDNS
nervahealth.com 9 2026-04-28 2026-08-18 ok
*.nervahealth.com 1 2026-08-18 2026-08-18 —
e.nervahealth.com 3 2026-08-11 2026-10-02 ok
landing.nervahealth.com 4 2026-06-03 2026-09-20 nodata
*.landing.nervahealth.com 4 2026-06-03 2026-09-20 —
link.nervahealth.com 3 2026-07-28 2026-09-18 ok
l.nervahealth.com 3 2026-05-05 2026-08-22 ok
refer.nervahealth.com 3 2026-05-25 2026-09-21 ok
start.nervahealth.com 5 2026-06-04 2026-09-20 ok
*.start.nervahealth.com 5 2026-06-04 2026-09-20 —
preview.nervahealth.com 2 2026-07-08 2026-08-29 ok
*.preview.nervahealth.com 2 2026-07-08 2026-08-29 —
www.nervahealth.com 7 2026-04-24 2026-10-04 ok
*.www.nervahealth.com 3 2026-08-13 2026-10-04 —

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