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 · 328 ms

Download CSV
HostCertsFirst seenLast seen
trelica.io 3 2026-02-22 2026-07-20
click.trelica.io 4 2026-04-20 2026-08-19
www.trelica.io 3 2026-02-22 2026-07-20

Programmatic access: API GET /v1/hosts/trelica.io (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/trelica.io.