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.

19 hosts · 335 ms

HostCertsFirst seenLast seenDNS
value-domain.com 28 2026-04-30 2026-09-05 ok
*.value-domain.com 24 2026-04-30 2026-08-26 —
one01.value-domain.com 3 2026-06-10 2026-08-11 ok
media2.value-domain.com 1 2026-09-14 2026-09-14 ok
media3.value-domain.com 3 2026-07-24 2026-09-23 ok
one.value-domain.com 2 2026-04-28 2026-04-28 ok
api-one.value-domain.com 2 2026-04-28 2026-04-28 ok
one-lookup-stg.value-domain.com 2 2026-09-05 2026-09-05 ok
*.one-lookup-stg.value-domain.com 2 2026-09-05 2026-09-05 —
www-lookup-stg.value-domain.com 2 2026-08-14 2026-08-14 ok
*.www-lookup-stg.value-domain.com 2 2026-08-14 2026-08-14 —
api.value-domain.com 2 2026-05-18 2026-05-18 ok
one-system.value-domain.com 4 2026-04-20 2026-08-20 ok
api-pro.value-domain.com 2 2026-05-18 2026-05-18 ok
cp.value-domain.com 2 2026-05-18 2026-05-18 ok
mcp.value-domain.com 2 2026-06-05 2026-06-05 ok
tools.value-domain.com 5 2026-05-25 2026-09-25 ok
mcp-dev.value-domain.com 2 2026-05-01 2026-05-01 ok
tools-dev.value-domain.com 5 2026-05-25 2026-09-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/value-domain.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/value-domain.com.