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.

18 hosts · 268 ms

HostCertsFirst seenLast seenDNS
baycrews.jp 4 2025-07-21 2026-06-25 ok
*.staging.baycrews.jp 2 2025-07-24 2026-06-23 —
mpfs-v2.staging.baycrews.jp 2 2026-02-26 2026-07-14 ok
mpfs.staging.baycrews.jp 2 2026-02-26 2026-07-14 ok
*.mpfs.staging.baycrews.jp 2 2025-07-26 2026-06-25 —
backend-api.baycrews.jp 1 2025-12-17 2025-12-17 ok
app-api.baycrews.jp 4 2025-07-21 2026-06-25 ok
*.internal.baycrews.jp 4 2026-04-14 2026-08-14 —
sgtm.baycrews.jp 3 2026-05-21 2026-09-03 ok
*.production.baycrews.jp 2 2025-07-24 2026-06-23 —
help.baycrews.jp 22 2026-05-28 2026-09-24 ok
images.baycrews.jp 2 2025-07-21 2026-05-25 ok
stg-images.baycrews.jp 2 2026-01-13 2026-01-13 ok
admin.mpfs.baycrews.jp 2 2025-07-26 2026-06-25 ok
wait.baycrews.jp 3 2026-04-07 2026-09-07 nodata
*.dev.baycrews.jp 2 2025-07-24 2026-06-23 —
www.baycrews.jp 4 2025-07-21 2026-06-25 ok
gocuxy.baycrews.jp 4 2026-05-12 2026-09-20 ok

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