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.

11 hosts · 316 ms

HostCertsFirst seenLast seenDNS
scienion.com 7 2025-07-14 2026-09-15 ok
*.scienion.com 2 2025-07-14 2026-08-03 —
webdisk.scienion.com 5 2026-05-16 2026-09-15 ok
cpanel.scienion.com 5 2026-05-16 2026-09-15 ok
webmail.scienion.com 5 2026-05-16 2026-09-15 ok
lifesciences.scienion.com 14 2026-05-26 2026-09-21 ok
files.scienion.com 13 2026-05-31 2026-09-27 ok
cpcalendars.scienion.com 5 2026-05-16 2026-09-15 ok
cpcontacts.scienion.com 5 2026-05-16 2026-09-15 ok
meet.scienion.com 18 2026-05-31 2026-09-26 ok
www.scienion.com 5 2026-05-16 2026-09-15 ok

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