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.

32 hosts · 265 ms

HostCertsFirst seenLast seenDNS
tsukubabank.co.jp 4 2026-03-10 2026-06-18 nodata
api1.tsukubabank.co.jp 3 2025-09-19 2026-10-06 ok
ib.tsukubabank.co.jp 18 2026-04-11 2026-09-19 ok
*.ib.tsukubabank.co.jp 16 2026-04-11 2026-09-19 —
id.tsukubabank.co.jp 4 2026-05-14 2026-08-05 nxdomain
bid.tsukubabank.co.jp 4 2026-05-14 2026-08-05 nxdomain
service.tsukubabank.co.jp 4 2026-05-14 2026-08-05 nxdomain
reference.tsukubabank.co.jp 2 2025-09-25 2026-09-08 ok
id-stg.tsukubabank.co.jp 5 2026-05-15 2026-09-01 ok
bid-stg.tsukubabank.co.jp 5 2026-05-15 2026-09-01 ok
service-stg.tsukubabank.co.jp 5 2026-05-15 2026-09-01 ok
b-portal.tsukubabank.co.jp 1 2026-05-11 2026-05-11 ok
im.tsukubabank.co.jp 1 2025-11-13 2025-11-13 ok
ztna.gcp.tsukubabank.co.jp 1 2026-08-24 2026-08-24 ok
*.ztna.gcp.tsukubabank.co.jp 1 2026-08-22 2026-08-22 —
manage.ztna.gcp.tsukubabank.co.jp 1 2026-08-22 2026-08-22 ok
signal.ztna.gcp.tsukubabank.co.jp 1 2026-08-23 2026-08-23 ok
app.ztna.gcp.tsukubabank.co.jp 1 2026-08-26 2026-08-26 ok
relay.ztna.gcp.tsukubabank.co.jp 1 2026-08-24 2026-08-24 ok
guacamole-tokyo-01.intra.gcp.tsukubabank.co.jp 1 2026-08-29 2026-08-29 nodata
*.webapp.gcp.tsukubabank.co.jp 1 2026-08-31 2026-08-31 —
rp.gcp.tsukubabank.co.jp 1 2026-08-19 2026-08-19 ok
*.rp.gcp.tsukubabank.co.jp 1 2026-08-19 2026-08-19 —
developer.tsukubabank.co.jp 3 2026-03-16 2026-08-16 nodata
id-test.tsukubabank.co.jp 2 2026-05-14 2026-05-14 ok
bid-test.tsukubabank.co.jp 2 2026-05-14 2026-05-14 ok
service-test.tsukubabank.co.jp 3 2026-05-14 2026-06-04 ok
*.test.tsukubabank.co.jp 1 2026-02-08 2026-02-08 —
api.test.tsukubabank.co.jp 1 2026-02-08 2026-02-08 ok
id-dev.tsukubabank.co.jp 4 2026-04-16 2026-05-14 ok
bid-dev.tsukubabank.co.jp 4 2026-04-16 2026-05-14 ok
www.tsukubabank.co.jp 4 2026-03-10 2026-06-18 ok

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