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 · 377 ms

HostCertsFirst seenLast seenDNS
nurosym.com 19 2026-05-21 2026-09-28 ok
*.nurosym.com 9 2026-04-01 2026-09-25 —
link.nurosym.com 4 2026-04-20 2026-08-16 ok
app.nurosym.com 4 2026-07-30 2026-09-25 ok
www.nurosym.com 16 2026-05-21 2026-09-29 ok

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