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.

6 hosts · 231 ms

HostCertsFirst seenLast seen
thehalara.com 12 2025-08-09 2026-07-25
*.thehalara.com 10 2025-08-13 2026-07-25
api-proxy.ca.thehalara.com 21 2025-08-13 2026-05-08
api-proxy.eur.thehalara.com 21 2025-08-13 2026-05-08
api-proxy.es.thehalara.com 20 2025-08-13 2026-05-08
www.thehalara.com 20 2025-08-13 2026-05-08

Programmatic access: API GET /v1/hosts/thehalara.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/thehalara.com.