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.

17 hosts · 322 ms

HostCertsFirst seenLast seenDNS
tsubakimoto.jp 2 2026-04-23 2026-05-26 ok
*.tsubakimoto.jp 1 2026-05-26 2026-05-26 —
nb.tsubakimoto.jp 7 2026-04-09 2026-10-01 ok
dxpmsprd.tsubakimoto.jp 2 2025-08-07 2026-09-04 ok
stg.tsubakimoto.jp 5 2026-05-25 2026-09-22 ok
tspmitsumori.tsubakimoto.jp 3 2026-06-08 2026-08-18 ok
cmscn.tsubakimoto.jp 4 2026-05-27 2026-10-04 ok
cmsen.tsubakimoto.jp 4 2026-05-27 2026-10-04 ok
drchain.tsubakimoto.jp 1 2025-06-18 2025-06-18 nodata
stg.drchain.tsubakimoto.jp 2 2025-06-25 2026-05-26 ok
www.drchain.tsubakimoto.jp 2 2025-06-25 2026-05-26 ok
ptmkgo.tsubakimoto.jp 9 2026-04-19 2026-09-18 ok
cmsjp.tsubakimoto.jp 4 2026-05-27 2026-10-04 ok
tspmitsumoritest.tsubakimoto.jp 3 2026-06-08 2026-08-17 ok
drchaintest.tsubakimoto.jp 1 2025-06-18 2025-06-18 nxdomain
dxpmsdev.tsubakimoto.jp 1 2026-06-09 2026-06-09 ok
www.tsubakimoto.jp 1 2026-04-23 2026-04-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/tsubakimoto.jp (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/tsubakimoto.jp.