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.

6 hosts · 347 ms

HostCertsFirst seenLast seenDNS
tsubaki-conveyor.in 3 2026-04-27 2026-08-29 ok
attendance.tsubaki-conveyor.in 1 2026-06-03 2026-06-03 ok
www.attendance.tsubaki-conveyor.in 1 2026-06-03 2026-06-03 nxdomain
mta-sts.tsubaki-conveyor.in 5 2026-05-05 2026-09-02 ok
www.mta-sts.tsubaki-conveyor.in 5 2026-05-05 2026-09-02 ok
www.tsubaki-conveyor.in 3 2026-04-27 2026-08-29 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tsubaki-conveyor.in (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-conveyor.in.