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.

4 hosts · 226 ms

HostCertsFirst seenLast seenDNS
adguard.com 22 2026-04-15 2026-09-19 ok
*.adguard.com 22 2026-04-15 2026-09-19 —
static.adguard.com 4 2026-06-11 2026-08-31 ok
status.adguard.com 5 2026-04-22 2026-08-19 ok

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