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.

6 hosts · 311 ms

HostCertsFirst seenLast seenDNS
imgs-coh.edu 8 2026-02-25 2026-09-01 ok
*.imgs-coh.edu 2 2026-02-25 2026-07-13 —
dev.imgs-coh.edu 2 2026-03-07 2026-07-23 ok
www.imgs-coh.edu 8 2026-05-06 2026-09-02 ok
stg-www.imgs-coh.edu 8 2026-04-29 2026-08-25 ok
dev-www.imgs-coh.edu 12 2026-04-29 2026-08-26 ok

Programmatic access, with DNS A records: API GET /v1/hosts/imgs-coh.edu (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/imgs-coh.edu.