Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

6 hosts · 301 ms

HostCertsFirst seenLast seen
novomins.com 13 2026-05-24 2026-10-03
701514095.novomins.com 8 2026-06-09 2026-10-06
781737287.novomins.com 11 2026-06-09 2026-10-06
signal.novomins.com 10 2026-05-10 2026-09-06
connect.novomins.com 10 2026-05-10 2026-09-06
www.novomins.com 17 2026-04-13 2026-10-09

Programmatic access: API GET /v1/hosts/novomins.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/novomins.com.