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.

4 hosts · 291 ms

HostCertsFirst seenLast seenDNS
estructuramx.com 9 2026-01-16 2026-10-03 ok
*.estructuramx.com 2 2026-06-11 2026-06-11 —
instagram.estructuramx.com 2 2025-08-16 2026-06-28 ok
www.estructuramx.com 7 2026-01-16 2026-10-03 ok

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