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.

11 hosts · 304 ms

HostCertsFirst seenLast seenDNS
datatonic.com 17 2026-04-24 2026-09-17 ok
*.datatonic.com 12 2026-05-22 2026-09-17 —
cf-static.datatonic.com 8 2026-04-24 2026-08-20 ok
marketing.datatonic.com 9 2026-04-19 2026-09-15 ok
servicedesk.internal.datatonic.com 2 2025-10-08 2026-09-08 ok
fr.datatonic.com 11 2026-05-24 2026-09-20 ok
cms.datatonic.com 11 2026-05-27 2026-09-22 ok
*.cms.datatonic.com 11 2026-05-27 2026-09-22 —
support.datatonic.com 11 2026-05-30 2026-09-25 ok
trust.datatonic.com 10 2026-05-04 2026-08-30 ok
www.datatonic.com 5 2026-04-24 2026-08-24 ok

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