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 · 286 ms

HostCertsFirst seenLast seenDNS
nbcgf.ie 5 2025-08-20 2026-08-24 ok
metrics-stage.nbcgf.ie 5 2026-07-15 2026-08-24 nxdomain
www-stage.nbcgf.ie 3 2026-05-05 2026-08-19 ok
ti.nbcgf.ie 9 2025-08-07 2026-08-24 ok
metrics.nbcgf.ie 4 2026-07-24 2026-08-24 nxdomain
www-dev.nbcgf.ie 4 2026-04-21 2026-08-19 ok
www.nbcgf.ie 5 2025-08-20 2026-08-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/nbcgf.ie (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/nbcgf.ie.