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.

16 hosts · 281 ms

HostCertsFirst seenLast seenDNS
cybertrust.ne.jp 2 2025-07-01 2026-07-13 ok
f5.cybertrust.ne.jp 1 2026-02-06 2026-02-06 ok
shotra.cybertrust.ne.jp 2 2025-07-07 2026-07-17 ok
sstra.cybertrust.ne.jp 2 2025-07-07 2026-07-17 ok
trusted-web-seal.cybertrust.ne.jp 4 2025-08-18 2026-08-16 ok
sstool.cybertrust.ne.jp 1 2025-11-02 2025-11-02 ok
service-info.cybertrust.ne.jp 1 2026-01-17 2026-01-17 ok
ssup.cybertrust.ne.jp 2 2025-11-11 2025-11-25 ok
evup.cybertrust.ne.jp 4 2025-08-18 2026-08-14 ok
web-requests.spr.cybertrust.ne.jp 2 2025-08-15 2026-08-10 nodata
acme-svr.cybertrust.ne.jp 2 2025-07-07 2026-07-17 ok
clubss.cybertrust.ne.jp 2 2025-07-07 2026-07-17 ok
web-requests.cybertrust.ne.jp 4 2025-09-09 2026-09-09 ok
status.cybertrust.ne.jp 5 2026-05-02 2026-08-28 ok
trusted-web-seal.test.cybertrust.ne.jp 3 2025-08-18 2026-08-13 nxdomain
www.cybertrust.ne.jp 2 2025-07-01 2026-07-13 ok

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