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.

6 hosts · 223 ms

HostCertsFirst seenLast seen
trileaf.com 17 2026-02-10 2026-08-26
*.trileaf.com 1 2026-02-10 2026-02-10
vpn.trileaf.com 1 2026-10-10 2026-10-10
www.trileaf.com 18 2026-05-04 2026-08-31
pay.trileaf.com 2 2026-08-20 2026-08-20
www.pay.trileaf.com 2 2026-08-20 2026-08-20

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