Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

3 hosts · 260 ms

Download CSV
HostCertsFirst seenLast seen
thelevelup.com 6 2026-05-26 2026-09-22
*.thelevelup.com 1 2026-08-17 2026-08-17
www.thelevelup.com 5 2026-04-24 2026-08-21

Programmatic access: API GET /v1/hosts/thelevelup.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/thelevelup.com.