Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

32 hosts · 219 ms

HostCertsFirst seenLast seen
denshishinsei-prd.fsa.go.jp 2 2025-06-26 2026-07-13
impact-finance.fsa.go.jp 1 2026-10-08 2026-10-08
fileshare.fsa.go.jp 1 2025-11-19 2025-11-19
clearing.fsa.go.jp 1 2026-06-15 2026-06-15
test-clearing.fsa.go.jp 1 2026-06-15 2026-06-15
denshishinsei-stg.fsa.go.jp 2 2025-06-26 2026-07-13
impact-consortium-stg.fsa.go.jp 2 2026-03-18 2026-09-04
search.fsa.go.jp 1 2026-06-30 2026-06-30
ken-search.fsa.go.jp 2 2025-09-30 2026-09-16
denshi-shinsei.fsa.go.jp 1 2026-01-09 2026-01-09
impact-consortium.fsa.go.jp 2 2026-02-09 2026-02-27
wanisa-caravan.fsa.go.jp 1 2026-04-24 2026-04-24
alb.ver-kaikeishi-shiken.fsa.go.jp 2 2026-05-06 2026-10-06
www.ver-kaikeishi-shiken.fsa.go.jp 2 2026-05-05 2026-10-05
alb.kaikeishi-shiken.fsa.go.jp 2 2026-05-05 2026-10-05
www.kaikeishi-shiken.fsa.go.jp 1 2026-06-03 2026-06-03
denshishinsei-kojin.fsa.go.jp 2 2025-06-26 2026-07-13
test-denshishinsei-kojin.fsa.go.jp 2 2025-06-26 2026-07-13
kashikin.fsa.go.jp 1 2026-06-15 2026-06-15
test-kashikin.fsa.go.jp 1 2026-06-15 2026-06-15
fimos.fsa.go.jp 2 2025-06-18 2026-07-06
st-fimos.fsa.go.jp 1 2026-04-17 2026-04-17
monitoring-supportsys.fsa.go.jp 2 2025-12-12 2025-12-18
*.monitoring-supportsys.fsa.go.jp 1 2025-12-18 2025-12-18
alb.ver-shiken-mgnt.fsa.go.jp 2 2026-05-06 2026-10-06
www.ver-shiken-mgnt.fsa.go.jp 2 2026-05-05 2026-10-05
alb.shiken-mgnt.fsa.go.jp 2 2026-05-05 2026-10-05
www.shiken-mgnt.fsa.go.jp 1 2026-06-03 2026-06-03
monitoring-supportsys-test.fsa.go.jp 12 2025-09-10 2026-09-30
*.monitoring-supportsys-test.fsa.go.jp 10 2025-09-10 2025-10-02
www.fsa.go.jp 1 2026-06-15 2026-06-15
test-www.fsa.go.jp 1 2026-06-15 2026-06-15

Programmatic access: API GET /v1/hosts/fsa.go.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/fsa.go.jp.