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.

7 hosts · 389 ms

HostCertsFirst seenLast seenDNS
rogersar.gov 6 2025-11-05 2026-09-30 ok
*.rogersar.gov 1 2025-11-05 2025-11-05 —
police.rogersar.gov 4 2026-04-18 2026-08-18 ok
www.police.rogersar.gov 4 2026-04-18 2026-08-18 ok
jobs.rogersar.gov 5 2026-05-13 2026-09-13 ok
www.rogersar.gov 10 2026-04-22 2026-08-18 ok
security.rogersar.gov 4 2026-04-29 2026-06-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/rogersar.gov (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/rogersar.gov.