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.

10 hosts · 342 ms

HostCertsFirst seenLast seenDNS
morepen.com 16 2025-07-03 2026-09-20 ok
*.morepen.com 11 2025-07-03 2026-09-20 —
webdisk.morepen.com 5 2026-05-04 2026-09-03 ok
cpanel.morepen.com 5 2026-05-04 2026-09-03 ok
mail.morepen.com 5 2026-05-04 2026-09-03 ok
webmail.morepen.com 5 2026-05-04 2026-09-03 ok
email.hello.morepen.com 5 2026-04-26 2026-08-24 ok
cpcalendars.morepen.com 5 2026-05-04 2026-09-03 ok
cpcontacts.morepen.com 5 2026-05-04 2026-09-03 ok
www.morepen.com 5 2026-05-04 2026-09-03 ok

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