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.

6 hosts · 235 ms

HostCertsFirst seenLast seenDNS
conexonconnect.com 15 2026-04-15 2026-09-26 ok
*.conexonconnect.com 10 2026-04-15 2026-09-26 —
east-parish.conexonconnect.com 8 2026-05-01 2026-08-27 ok
email.conexonconnect.com 6 2026-04-23 2026-08-19 ok
info.conexonconnect.com 8 2026-04-12 2026-08-08 ok
www.conexonconnect.com 5 2026-05-21 2026-09-20 ok

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