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 · 272 ms

HostCertsFirst seenLast seenDNS
cloud.contact-april.com 1 2025-12-11 2025-12-11 ok
image.contact-april.com 3 2025-10-29 2025-12-11 ok
click.contact-april.com 1 2025-12-11 2025-12-11 ok
view.contact-april.com 1 2025-12-11 2025-12-11 ok

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