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.

23 hosts · 227 ms

HostCertsFirst seenLast seen
classnk.or.jp 6 2025-10-27 2026-09-30
*.classnk.or.jp 3 2025-10-27 2026-09-08
nkauth-stg30.classnk.or.jp 10 2026-05-18 2026-09-15
ondemand.classnk.or.jp 3 2026-06-01 2026-08-09
www.ondemand.classnk.or.jp 3 2026-06-01 2026-08-09
emission-calc.ghg.classnk.or.jp 3 2026-06-06 2026-06-06
emission-calc-stg.ghg.classnk.or.jp 3 2026-05-31 2026-06-06
emission-calc.stg.ghg.classnk.or.jp 3 2026-06-10 2026-06-10
emission-calc.trl.ghg.classnk.or.jp 2 2026-06-12 2026-06-12
nkauth-stg.classnk.or.jp 8 2026-04-19 2026-08-15
nkauth.classnk.or.jp 10 2026-04-29 2026-08-26
zeta-pp-api.classnk.or.jp 2 2026-03-01 2026-07-17
nkauth-trl.classnk.or.jp 10 2026-04-27 2026-08-24
zeta-pp.classnk.or.jp 4 2026-03-01 2026-07-17
zeta-pp-api-ver.classnk.or.jp 2 2026-03-12 2026-07-28
zeta-pp-ver.classnk.or.jp 2 2026-03-12 2026-07-28
auth0-wacdas.classnk.or.jp 8 2026-04-20 2026-08-17
trl-auth0-wacdas.classnk.or.jp 8 2026-04-21 2026-08-17
ticket.classnk.or.jp 9 2026-06-06 2026-10-04
event.classnk.or.jp 20 2026-01-21 2026-10-08
zeta-pp-api-dev.classnk.or.jp 2 2026-03-12 2026-07-28
zeta-pp-dev.classnk.or.jp 2 2026-03-12 2026-07-28
www.classnk.or.jp 3 2026-04-02 2026-09-30

Programmatic access: API GET /v1/hosts/classnk.or.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/classnk.or.jp.