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.

13 hosts · 299 ms

HostCertsFirst seenLast seenDNS
tsubaki.eu 2 2025-11-29 2026-06-23 ok
*.tsubaki.eu 1 2026-06-23 2026-06-23 —
tsubakitree.tsubaki.eu 5 2026-05-05 2026-09-02 ok
cam-clutch.tsubaki.eu 5 2026-05-05 2026-09-02 ok
www.cam-clutch.tsubaki.eu 5 2026-05-05 2026-09-02 ok
go.tsubaki.eu 10 2026-04-28 2026-09-25 ok
rider.tsubaki.eu 3 2026-06-12 2026-08-24 ok
cms.tsubaki.eu 1 2026-05-26 2026-05-26 ok
mta-sts.tsubaki.eu 5 2026-05-05 2026-09-02 ok
www.mta-sts.tsubaki.eu 5 2026-05-05 2026-09-02 ok
itsupport.tsubaki.eu 10 2026-05-27 2026-09-24 ok
www.tsubaki.eu 1 2025-11-29 2025-11-29 ok
my.tsubaki.eu 1 2026-02-25 2026-02-25 ok

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