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.

6 hosts · 268 ms

HostCertsFirst seenLast seenDNS
snctm.com 29 2026-04-20 2026-10-03 ok
*.snctm.com 26 2026-04-20 2026-10-03 —
auth.snctm.com 10 2026-04-30 2026-08-27 ok
admin-app.snctm.com 3 2026-05-12 2026-08-30 ok
analytics.snctm.com 1 2026-09-01 2026-09-01 ok
www.snctm.com 4 2026-06-01 2026-09-17 ok

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