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.

5 hosts · 344 ms

HostCertsFirst seenLast seenDNS
sunski.com 16 2026-05-24 2026-10-01 ok
store.sunski.com 15 2026-05-15 2026-09-23 ok
account.sunski.com 19 2026-04-19 2026-10-01 ok
sst.sunski.com 4 2026-08-06 2026-10-05 ok
www.sunski.com 15 2026-05-26 2026-10-04 ok

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