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.

10 hosts · 361 ms

HostCertsFirst seenLast seenDNS
wellington-school.org.uk 25 2025-08-04 2026-09-03 ok
*.wellington-school.org.uk 14 2025-08-04 2026-07-27 —
ws-dc-01.internal.wellington-school.org.uk 1 2026-07-27 2026-07-27 nxdomain
ws-dc01.internal.wellington-school.org.uk 2 2025-08-11 2025-08-12 nxdomain
www.ws-dc01.internal.wellington-school.org.uk 2 2025-08-11 2025-08-12 nxdomain
portal.wellington-school.org.uk 40 2026-04-12 2026-10-04 ok
calendar.wellington-school.org.uk 5 2026-05-26 2026-09-14 ok
isams.wellington-school.org.uk 10 2026-06-11 2026-09-30 ok
bursarysupport.wellington-school.org.uk 2 2025-09-03 2026-08-04 ok
www.wellington-school.org.uk 16 2026-05-08 2026-09-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/wellington-school.org.uk (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/wellington-school.org.uk.