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 · 229 ms

HostCertsFirst seenLast seenDNS
save.insurify.com 2 2026-09-10 2026-09-10 ok
links.save.insurify.com 2 2026-04-08 2026-09-08 ok
*.links.save.insurify.com 2 2026-04-08 2026-09-08 —

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