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.

9 hosts · 277 ms

HostCertsFirst seenLast seenDNS
tsubaki.co.th 1 2026-05-05 2026-05-05 ok
store.tsubaki.co.th 1 2026-09-01 2026-09-01 ok
www.store.tsubaki.co.th 1 2026-09-01 2026-09-01 nxdomain
en.tsubaki.co.th 1 2026-05-05 2026-05-05 ok
mta-sts.tsubaki.co.th 5 2026-05-05 2026-09-02 ok
www.mta-sts.tsubaki.co.th 5 2026-05-05 2026-09-02 ok
dev.tsubaki.co.th 4 2026-05-05 2026-07-04 ok
www.dev.tsubaki.co.th 4 2026-05-05 2026-07-04 ok
www.tsubaki.co.th 1 2026-05-05 2026-05-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tsubaki.co.th (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/tsubaki.co.th.