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.

8 hosts · 277 ms

HostCertsFirst seenLast seenDNS
hiyahealth.com 15 2026-05-17 2026-09-27 ok
brand.hiyahealth.com 1 2025-11-26 2025-11-26 ok
i.hiyahealth.com 3 2026-05-08 2026-08-24 ok
learn.hiyahealth.com 1 2026-08-19 2026-08-19 ok
shop.hiyahealth.com 5 2026-05-04 2026-09-05 ok
vchhr.hiyahealth.com 16 2026-04-22 2026-08-19 ok
get.hiyahealth.com 17 2026-05-19 2026-09-27 ok
www.hiyahealth.com 12 2026-05-18 2026-09-26 ok

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