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.

2 hosts · 249 ms

HostCertsFirst seenLast seenDNS
registrobienesmuebles.org 1 2026-04-29 2026-04-29 ok
mta-sts.registrobienesmuebles.org 3 2026-04-26 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/registrobienesmuebles.org (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/registrobienesmuebles.org.