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 · 367 ms

HostCertsFirst seenLast seenDNS
sokuresu.ai 3 2025-09-30 2026-07-16 ok
*.sokuresu.ai 2 2026-06-24 2026-07-16 —
staging-auth.sokuresu.ai 1 2026-03-04 2026-03-04 ok
ofo2zh2vk4kb3q9yoa5o1oycd11nfqm.staging-auth.sokuresu.ai 1 2026-03-04 2026-03-04 nxdomain
staging-guardrail.sokuresu.ai 1 2026-03-04 2026-03-04 nxdomain
043jbm4jkegu2f6zswvs9bby9rta5mq.staging-guardrail.sokuresu.ai 1 2026-03-04 2026-03-04 nxdomain
mlp.sokuresu.ai 1 2026-02-19 2026-02-19 nxdomain
development.sokuresu.ai 1 2025-08-28 2025-08-28 nodata
support.sokuresu.ai 11 2026-06-04 2026-09-30 ok
biz.sokuresu.ai 7 2026-06-04 2026-09-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/sokuresu.ai (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/sokuresu.ai.