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.

3 hosts · 354 ms

HostCertsFirst seenLast seenDNS
emyoga.net 4 2026-04-14 2026-08-31 ok
learn.emyoga.net 12 2026-05-24 2026-09-19 ok
www.emyoga.net 4 2026-04-14 2026-08-31 ok

Programmatic access, with DNS A records: API GET /v1/hosts/emyoga.net (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/emyoga.net.