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.

26 hosts · 305 ms

HostCertsFirst seenLast seenDNS
tsubakimoto.co.jp 3 2025-06-19 2026-07-02 nodata
*.tsubakimoto.co.jp 3 2025-06-19 2026-07-02 —
api-cloud-matehan-plk3001.tsubakimoto.co.jp 2 2025-08-31 2026-08-01 ok
www-cloud-matehan-plk3001.tsubakimoto.co.jp 2 2025-08-30 2026-07-31 ok
tt-net2.tsubakimoto.co.jp 4 2025-07-02 2026-09-07 ok
*.tt-net2.tsubakimoto.co.jp 6 2026-06-22 2026-09-30 —
t77.tsubakimoto.co.jp 1 2025-10-20 2025-10-20 nodata
*.t77.tsubakimoto.co.jp 1 2025-10-20 2025-10-20 —
tgw77.tsubakimoto.co.jp 1 2025-10-20 2025-10-20 ok
tc1fullweb.tsubakimoto.co.jp 2 2025-07-22 2026-08-07 nxdomain
kannaviwf.tsubakimoto.co.jp 2 2025-07-28 2026-08-07 ok
edi.tsubakimoto.co.jp 1 2025-12-02 2025-12-02 ok
tmfpdm.tsubakimoto.co.jp 3 2026-03-26 2026-09-15 nxdomain
securelogin.tsubakimoto.co.jp 1 2025-10-20 2025-10-20 nxdomain
ptmkgo.tsubakimoto.co.jp 9 2026-04-20 2026-09-17 ok
gr.tsubakimoto.co.jp 2 2025-08-20 2026-09-07 nodata
*.gr.tsubakimoto.co.jp 2 2025-08-20 2026-09-07 —
sr.tsubakimoto.co.jp 1 2025-12-01 2025-12-01 ok
ofs.tsubakimoto.co.jp 1 2025-10-14 2025-10-14 ok
ptps.tsubakimoto.co.jp 2 2025-06-19 2026-06-30 ok
tt-net.tsubakimoto.co.jp 3 2025-12-22 2026-09-07 ok
*.tt-net.tsubakimoto.co.jp 6 2026-06-17 2026-09-25 —
kannaviwftest.tsubakimoto.co.jp 5 2025-07-28 2026-10-07 ok
tgw.tsubakimoto.co.jp 1 2026-03-05 2026-03-05 ok
mcx.tsubakimoto.co.jp 1 2026-04-27 2026-04-27 ok
biz.tsubakimoto.co.jp 3 2025-12-02 2026-07-10 ok

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