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.

14 hosts · 296 ms

HostCertsFirst seenLast seenDNS
contractorsischool.com 13 2025-11-21 2026-08-14 ok
*.contractorsischool.com 18 2025-08-25 2026-08-14 —
review.v1.contractorsischool.com 4 2026-06-02 2026-10-05 ok
apps.demo.contractorsischool.com 5 2026-05-12 2026-09-15 ok
mt-link.dev-k8s.contractorsischool.com 5 2026-04-17 2026-09-27 ok
apps.contractorsischool.com 5 2026-04-26 2026-08-28 ok
mt-link.apps.contractorsischool.com 4 2026-06-03 2026-09-18 ok
sst.contractorsischool.com 2 2026-05-01 2026-05-01 ok
dev.contractorsischool.com 1 2026-05-07 2026-05-07 ok
*.dev.contractorsischool.com 2 2025-12-22 2026-05-07 —
apps.dev.contractorsischool.com 4 2026-04-16 2026-08-17 ok
review.dev.contractorsischool.com 4 2026-04-15 2026-08-17 ok
review.contractorsischool.com 5 2026-04-25 2026-08-26 ok
mt-link.review.contractorsischool.com 4 2026-06-03 2026-09-19 ok

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