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.

5 hosts · 364 ms

HostCertsFirst seenLast seen
thehalara.co.uk 26 2025-07-04 2026-06-23
*.thehalara.co.uk 5 2025-07-04 2026-09-19
collective-api.thehalara.co.uk 10 2025-11-14 2026-05-08
www.thehalara.co.uk 20 2025-08-13 2026-05-08
api-proxy.thehalara.co.uk 20 2025-08-13 2026-05-08

Programmatic access: API GET /v1/hosts/thehalara.co.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/thehalara.co.uk.