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 · 178 ms

HostCertsFirst seenLast seenDNS
airvoicewireless.com 17 2026-04-13 2026-09-26 ok
*.airvoicewireless.com 19 2026-03-02 2026-09-26 —
checkout.airvoicewireless.com 8 2026-04-21 2026-08-18 ok

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