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.

5 hosts · 419 ms

HostCertsFirst seenLast seenDNS
animalsmatter.com 15 2026-05-15 2026-09-23 ok
gsnrgj.animalsmatter.com 5 2026-04-16 2026-10-01 ok
returns.animalsmatter.com 6 2026-05-15 2026-09-10 ok
account.animalsmatter.com 5 2026-06-06 2026-10-04 ok
www.animalsmatter.com 18 2026-04-17 2026-08-26 ok

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