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.

3 hosts · 291 ms

HostCertsFirst seenLast seenDNS
auxe.ca 16 2026-04-13 2026-09-25 ok
*.auxe.ca 7 2026-04-13 2026-09-25 —
www.auxe.ca 9 2026-05-24 2026-09-20 ok

Programmatic access, with DNS A records: API GET /v1/hosts/auxe.ca (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/auxe.ca.