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.

12 hosts · 233 ms

HostCertsFirst seenLast seenDNS
tsubaki.sg 1 2026-04-18 2026-04-18 ok
dev2.tsubaki.sg 4 2026-05-05 2026-07-04 ok
www.dev2.tsubaki.sg 4 2026-05-05 2026-07-04 ok
store.tsubaki.sg 3 2025-10-30 2026-03-11 ok
*.store.tsubaki.sg 2 2025-10-30 2025-10-30 —
www.store.tsubaki.sg 1 2026-03-11 2026-03-11 nxdomain
mta-sts.tsubaki.sg 5 2026-05-05 2026-09-02 ok
www.mta-sts.tsubaki.sg 5 2026-05-05 2026-09-02 ok
storetest.tsubaki.sg 2 2026-03-10 2026-09-07 ok
*.storetest.tsubaki.sg 1 2026-03-10 2026-03-10 —
www.storetest.tsubaki.sg 1 2026-09-07 2026-09-07 nxdomain
www.tsubaki.sg 1 2026-04-18 2026-04-18 ok

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