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.

18 hosts · 309 ms

HostCertsFirst seenLast seenDNS
sttark.com 4 2026-05-21 2026-07-20 ok
docs2.sttark.com 3 2026-08-04 2026-10-06 ok
machine.sttark.com 2 2026-06-12 2026-06-12 nxdomain
*.machine.sttark.com 2 2026-06-12 2026-06-12 —
give.sttark.com 6 2026-05-06 2026-09-30 ok
swag.sttark.com 6 2026-05-08 2026-09-30 ok
eng.sttark.com 3 2026-07-07 2026-09-07 ok
*.eng.sttark.com 3 2026-07-07 2026-09-07 —
test-customer-api.sttark.com 1 2026-08-21 2026-08-21 ok
mcp.sttark.com 1 2026-08-17 2026-08-17 ok
machinebroker.sttark.com 5 2026-06-06 2026-10-04 ok
user.sttark.com 5 2026-05-21 2026-09-18 ok
s.sttark.com 5 2026-05-19 2026-09-15 ok
docs.sttark.com 3 2026-07-30 2026-10-06 ok
ws.sttark.com 5 2026-06-15 2026-08-15 ok
inspect.sttark.com 3 2026-08-04 2026-10-04 ok
www.sttark.com 4 2026-05-21 2026-07-20 ok
sandbox.sttark.com 1 2026-08-21 2026-08-21 nxdomain

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