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 · 339 ms

HostCertsFirst seenLast seenDNS
adguard-vpn.com 20 2026-04-15 2026-09-26 ok
*.adguard-vpn.com 20 2026-04-15 2026-09-26 —
static.adguard-vpn.com 11 2026-06-02 2026-10-05 ok

Programmatic access, with DNS A records: API GET /v1/hosts/adguard-vpn.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/adguard-vpn.com.