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.

46 hosts · 310 ms

HostCertsFirst seenLast seenDNS
tc10.nhk-cs.jp 1 2026-05-18 2026-05-18 ok
service10.nhk-cs.jp 4 2025-10-14 2026-09-28 ok
auth10.nhk-cs.jp 1 2026-03-02 2026-03-02 ok
api10.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
cms10.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
mailresult10.nhk-cs.jp 4 2025-10-14 2026-09-28 ok
w10.nhk-cs.jp 2 2025-07-22 2026-07-22 ok
service20.nhk-cs.jp 2 2025-09-08 2026-09-25 ok
api20.nhk-cs.jp 3 2025-09-08 2026-09-25 ok
cms20.nhk-cs.jp 2 2025-09-08 2026-09-25 ok
mailresult20.nhk-cs.jp 3 2025-09-08 2026-09-25 ok
w20.nhk-cs.jp 2 2025-07-22 2026-07-22 ok
service30.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
api30.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
cms30.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
mailresult30.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
w01.nhk-cs.jp 2 2025-07-22 2026-07-22 ok
w11.nhk-cs.jp 2 2025-07-22 2026-07-22 ok
tc.nhk-cs.jp 1 2026-05-18 2026-05-18 ok
service.nhk-cs.jp 4 2026-03-02 2026-09-28 ok
auth.nhk-cs.jp 1 2026-01-14 2026-01-14 ok
api.nhk-cs.jp 1 2026-03-02 2026-03-02 ok
credit-tk.nhk-cs.jp 2 2025-08-07 2026-08-20 ok
mpn.credit-registation.nhk-cs.jp 2 2026-08-12 2026-08-12 ok
credit-s.nhk-cs.jp 2 2025-07-15 2026-07-17 ok
mpn.credit-s.nhk-cs.jp 3 2025-08-12 2026-08-20 ok
cms.nhk-cs.jp 1 2026-03-02 2026-03-02 ok
a10.contract.nhk-cs.jp 2 2025-07-09 2026-07-17 ok
a20.contract.nhk-cs.jp 2 2025-09-19 2026-09-25 ok
a30.contract.nhk-cs.jp 1 2025-11-12 2025-11-12 ok
api-backend2.contract.nhk-cs.jp 1 2026-01-16 2026-01-16 ok
a10-backend.contract.nhk-cs.jp 1 2026-01-16 2026-01-16 ok
a20-backend.contract.nhk-cs.jp 1 2026-04-22 2026-04-22 ok
a30-backend.contract.nhk-cs.jp 1 2026-04-22 2026-04-22 ok
api-backend.contract.nhk-cs.jp 1 2026-01-16 2026-01-16 ok
api.contract.nhk-cs.jp 1 2026-01-14 2026-01-14 ok
a20-back.contract.nhk-cs.jp 1 2025-09-19 2025-09-19 ok
a30-back.contract.nhk-cs.jp 1 2025-10-14 2025-10-14 ok
mailresult.nhk-cs.jp 4 2026-03-02 2026-09-28 ok
credit-tk-test.nhk-cs.jp 1 2026-04-17 2026-04-17 ok
mpn.credit-registation-test.nhk-cs.jp 1 2026-05-20 2026-05-20 ok
credit-s-test.nhk-cs.jp 2 2025-07-15 2026-07-17 ok
mpn.credit-s-test.nhk-cs.jp 3 2025-08-05 2026-08-20 ok
www.nhk-cs.jp 2 2025-07-22 2026-07-22 ok
w10.service-biz.nhk-cs.jp 1 2026-06-14 2026-06-14 ok
www.service-biz.nhk-cs.jp 1 2026-06-14 2026-06-14 ok

Programmatic access, with DNS A records: API GET /v1/hosts/nhk-cs.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/nhk-cs.jp.