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.

21 hosts · 280 ms

HostCertsFirst seenLast seenDNS
netird.ad.jp 1 2026-04-13 2026-04-13 nodata
*.netird.ad.jp 1 2026-04-13 2026-04-13 —
watchdog3.netird.ad.jp 5 2026-05-08 2026-09-11 ok
carrots6.netird.ad.jp 5 2026-05-15 2026-09-18 ok
carrots7.netird.ad.jp 5 2026-04-24 2026-08-28 ok
jart-admin.kanda.netird.ad.jp 3 2026-06-07 2026-08-09 ok
jart.kanda.netird.ad.jp 3 2026-06-07 2026-08-09 ok
box2.tk.netird.ad.jp 5 2026-04-22 2026-08-21 ok
st.admin.jsrt.netird.ad.jp 5 2026-05-17 2026-09-20 ok
st.jsrt.netird.ad.jp 5 2026-05-17 2026-09-20 ok
jjjrs.st.netird.ad.jp 3 2026-06-07 2026-08-09 ok
admin.jjjrs.st.netird.ad.jp 3 2026-06-07 2026-08-09 ok
alpha.dev.netird.ad.jp 5 2026-05-17 2026-09-12 ok
gmo-aozora.alpha.dev.netird.ad.jp 5 2026-05-17 2026-09-12 ok
authentik.alpha.dev.netird.ad.jp 6 2026-06-04 2026-09-30 ok
sso.alpha.dev.netird.ad.jp 5 2026-05-31 2026-09-26 ok
kagoya-proxy.alpha.dev.netird.ad.jp 5 2026-05-27 2026-09-22 ok
site.jartdev.netird.ad.jp 2 2026-07-14 2026-07-14 ok
el.jartdev.netird.ad.jp 7 2026-04-27 2026-09-25 ok
sso.jartdev.netird.ad.jp 5 2026-05-29 2026-09-26 ok
zabbix.jartdev.netird.ad.jp 5 2026-06-04 2026-10-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/netird.ad.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/netird.ad.jp.