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.

7 hosts · 354 ms

HostCertsFirst seenLast seenDNS
ngbservice.com 5 2026-02-13 2026-10-03 ok
mail.ngbservice.com 1 2026-02-13 2026-02-13 ok
vpn.ngbservice.com 1 2026-02-13 2026-02-13 ok
autodiscover.ngbservice.com 1 2026-02-13 2026-02-13 ok
iris.ngbservice.com 1 2026-02-13 2026-02-13 ok
www.ngbservice.com 4 2026-02-19 2026-10-03 ok
pbx.ngbservice.com 1 2026-02-13 2026-02-13 ok

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