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.

12 hosts · 278 ms

HostCertsFirst seenLast seenDNS
marks-clerk.com 1 2025-07-16 2025-07-16 ok
*.marks-clerk.com 2 2025-07-15 2026-07-16 —
micollab.marks-clerk.com 2 2026-05-03 2026-05-03 ok
sentryweb.marks-clerk.com 1 2025-07-07 2025-07-07 ok
remote.marks-clerk.com 2 2025-07-31 2026-07-16 ok
portal.marks-clerk.com 1 2026-05-06 2026-05-06 nxdomain
www.portal.marks-clerk.com 1 2026-05-06 2026-05-06 nxdomain
mobileiron.marks-clerk.com 2 2025-07-15 2026-07-15 ok
resources.marks-clerk.com 14 2026-05-18 2026-09-13 ok
reacts.marks-clerk.com 3 2025-12-16 2025-12-16 ok
www.marks-clerk.com 3 2025-07-16 2026-07-21 ok
o365sentry.marks-clerk.com 2 2025-07-15 2026-07-16 ok

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