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.

10 hosts · 247 ms

HostCertsFirst seenLast seenDNS
adachikan.com 13 2026-04-19 2026-09-23 ok
*.adachikan.com 6 2026-04-19 2026-08-16 —
profile.adachikan.com 2 2026-05-27 2026-05-27 nxdomain
api.adachikan.com 3 2026-06-08 2026-08-07 ok
admin.adachikan.com 4 2026-05-06 2026-07-05 ok
uatpreprod-admin.adachikan.com 4 2026-04-20 2026-08-19 ok
demo.adachikan.com 2 2026-05-06 2026-05-06 nxdomain
links.adachikan.com 3 2026-06-14 2026-08-29 ok
account.adachikan.com 5 2026-05-29 2026-09-26 ok
www.adachikan.com 7 2026-05-24 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/adachikan.com (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/adachikan.com.