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.

16 hosts · 187 ms

HostCertsFirst seenLast seen
causewaycoastandglens.gov.uk 8 2026-02-05 2026-08-27
*.causewaycoastandglens.gov.uk 3 2026-03-03 2026-03-05
sec1.causewaycoastandglens.gov.uk 2 2026-03-30 2026-10-06
www.sec1.causewaycoastandglens.gov.uk 2 2026-03-30 2026-10-06
exch365.causewaycoastandglens.gov.uk 1 2026-02-05 2026-02-05
sec5.causewaycoastandglens.gov.uk 3 2025-10-29 2026-10-06
www.sec5.causewaycoastandglens.gov.uk 3 2025-10-29 2026-10-06
owa.causewaycoastandglens.gov.uk 1 2026-02-05 2026-02-05
mta-sts.mc.causewaycoastandglens.gov.uk 4 2026-05-04 2026-07-28
staff.causewaycoastandglens.gov.uk 5 2026-05-04 2026-09-02
staging.causewaycoastandglens.gov.uk 5 2026-04-29 2026-08-27
mta-sts.planning.causewaycoastandglens.gov.uk 1 2026-09-30 2026-09-30
autodiscover.causewaycoastandglens.gov.uk 1 2026-02-05 2026-02-05
mta-sts.es.causewaycoastandglens.gov.uk 5 2026-04-25 2026-08-24
mta-sts.causewaycoastandglens.gov.uk 5 2026-05-28 2026-09-26
www.causewaycoastandglens.gov.uk 4 2026-06-04 2026-08-27

Programmatic access: API GET /v1/hosts/causewaycoastandglens.gov.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/causewaycoastandglens.gov.uk.