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 · 318 ms

HostCertsFirst seenLast seenDNS
acens.com 11 2025-10-15 2026-08-16 ok
*.acens.com 1 2025-12-09 2025-12-09 —
tienda.acens.com 1 2026-02-04 2026-02-04 ok
ayuda.acens.com 1 2026-01-21 2026-01-21 ok
blog.acens.com 5 2026-06-02 2026-08-24 ok
cf-fallback.acens.com 13 2026-05-26 2026-09-21 ok
www.acens.com 10 2025-10-15 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/acens.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/acens.com.