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 · 282 ms

HostCertsFirst seenLast seenDNS
yiume.com 15 2026-04-13 2026-09-26 ok
outlets.yiume.com 15 2026-05-25 2026-10-03 ok
account.yiume.com 15 2026-04-11 2026-09-24 ok
au.yiume.com 13 2026-05-01 2026-09-10 ok
www.yiume.com 15 2026-04-13 2026-09-26 ok

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