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 · 261 ms

HostCertsFirst seenLast seenDNS
cri.studentaid.gov 11 2025-09-15 2026-09-23 ok
origin1.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
origin2.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
nsighthub.cri.studentaid.gov 11 2025-09-15 2026-09-23 ok
origin1-nsighthub.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
origin2-nsighthub.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
auth.cri.studentaid.gov 11 2025-09-15 2026-09-23 ok
origin1-auth.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
origin2-auth.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
mmaapi.cri.studentaid.gov 11 2025-09-15 2026-09-23 ok
origin1-mmaapi.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
origin2-mmaapi.cri.studentaid.gov 2 2026-02-25 2026-08-25 ok
data.guides.cri.studentaid.gov 3 2026-05-22 2026-09-04 ok
content.guides.cri.studentaid.gov 5 2026-02-22 2026-08-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/cri.studentaid.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/cri.studentaid.gov.