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.

3 hosts · 339 ms

HostCertsFirst seenLast seenDNS
site.acogida.seur.net 6 2026-04-22 2026-09-29 ok
mi.seur.net 3 2026-05-17 2026-09-03 ok
marca-comunicacion.seur.net 3 2026-05-15 2026-09-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/seur.net (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/seur.net.