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.

19 hosts · 238 ms

HostCertsFirst seenLast seenDNS
fidelity.co.jp 10 2025-09-19 2026-09-17 ok
invest-navi.fidelity.co.jp 5 2025-10-22 2026-09-17 ok
dev.invest-navi.fidelity.co.jp 2 2026-09-19 2026-09-27 ok
*.dev.invest-navi.fidelity.co.jp 2 2026-09-19 2026-09-27 —
prv.invest-navi.fidelity.co.jp 3 2026-03-27 2026-09-23 servfail
jpvpn.fidelity.co.jp 2 2025-08-14 2026-08-12 ok
retirementnp.fidelity.co.jp 5 2026-05-27 2026-07-09 ok
page.ws.fidelity.co.jp 6 2026-05-06 2026-09-01 ok
email.ws.fidelity.co.jp 6 2026-05-07 2026-09-02 ok
cat.fidelity.co.jp 7 2025-07-08 2026-07-30 ok
qat.fidelity.co.jp 5 2025-07-08 2026-07-02 ok
retirement.fidelity.co.jp 2 2025-08-12 2026-07-27 ok
www.retirement.fidelity.co.jp 1 2025-08-12 2025-08-12 nxdomain
dev.fidelity.co.jp 5 2025-07-08 2026-06-29 ok
prv.fidelity.co.jp 6 2026-03-27 2026-09-23 ok
new.fidelity.co.jp 2 2025-10-22 2025-10-22 nxdomain
www.fidelity.co.jp 11 2025-09-01 2026-09-17 ok
clubfidelity.fidelity.co.jp 4 2025-10-22 2026-09-17 ok
prv.clubfidelity.fidelity.co.jp 3 2026-03-27 2026-09-23 servfail

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