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 · 372 ms

HostCertsFirst seenLast seenDNS
techowl.com 11 2026-04-11 2026-09-16 ok
*.techowl.com 8 2026-04-12 2026-09-16 —
webdisk.techowl.com 3 2026-04-11 2026-06-11 ok
cpanel.techowl.com 3 2026-04-11 2026-06-11 ok
mail.techowl.com 3 2026-04-11 2026-06-11 ok
webmail.techowl.com 3 2026-04-11 2026-06-11 ok
vpn.techowl.com 1 2026-08-31 2026-08-31 ok
autodiscover.techowl.com 3 2026-04-11 2026-06-11 ok
cpcalendars.techowl.com 3 2026-04-11 2026-06-11 ok
cpcontacts.techowl.com 3 2026-04-11 2026-06-11 ok
www.techowl.com 3 2026-04-11 2026-06-11 ok

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