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.

2 hosts · 333 ms

HostCertsFirst seenLast seenDNS
myairbridge.com 20 2026-05-12 2026-09-14 ok
*.myairbridge.com 20 2026-05-12 2026-09-14 —

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