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.

12 hosts · 331 ms

HostCertsFirst seenLast seenDNS
conexpoconagg.com 3 2025-07-07 2026-07-08 ok
e.conexpoconagg.com 4 2026-07-23 2026-09-07 ok
kentico.conexpoconagg.com 3 2025-07-07 2026-07-08 ok
dev-kentico.conexpoconagg.com 2 2025-07-08 2026-07-10 ok
app.conexpoconagg.com 9 2026-05-01 2026-08-25 ok
uploads.conexpoconagg.com 5 2026-04-22 2026-08-20 ok
updates.conexpoconagg.com 9 2026-04-22 2026-09-16 ok
news.conexpoconagg.com 3 2025-07-07 2026-07-08 ok
dev.conexpoconagg.com 2 2025-07-08 2026-07-10 ok
www.conexpoconagg.com 3 2025-07-07 2026-07-08 ok
directory.conexpoconagg.com 4 2025-07-13 2026-06-17 ok
*.directory.conexpoconagg.com 2 2025-07-17 2026-06-17 —

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