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 · 244 ms

HostCertsFirst seenLast seenDNS
internetnz.net.nz 5 2026-04-10 2026-10-07 ok
2014.internetnz.net.nz 5 2026-04-10 2026-10-07 ok
news.internetnz.net.nz 4 2026-06-08 2026-10-05 ok
www.internetnz.net.nz 5 2026-04-10 2026-10-07 ok

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