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 · 302 ms

HostCertsFirst seenLast seenDNS
demetres.com 5 2026-04-24 2026-08-17 ok
shop.demetres.com 15 2026-05-16 2026-09-25 ok
order.demetres.com 12 2026-04-26 2026-08-22 ok
mta-sts.demetres.com 2 2025-09-21 2026-08-22 ok
www.demetres.com 5 2026-05-29 2026-09-11 ok

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