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.

4 hosts · 247 ms

HostCertsFirst seenLast seen
nu-mega.com 1 2026-05-29 2026-05-29
*.nu-mega.com 1 2026-05-29 2026-05-29
performance.nu-mega.com 1 2026-09-22 2026-09-22
forecast.nu-mega.com 1 2026-07-30 2026-07-30

Programmatic access: API GET /v1/hosts/nu-mega.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/nu-mega.com.