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 · 179 ms

HostCertsFirst seenLast seenDNS
plarium-email.com 8 2026-04-25 2026-08-26 nodata
*.plarium-email.com 8 2026-04-25 2026-08-26 —
41411052.news.plarium-email.com 10 2026-05-07 2026-09-02 ok
link.news.plarium-email.com 12 2026-05-07 2026-09-01 ok

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