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.

4 hosts · 153 ms

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HostCertsFirst seenLast seen
dsti.co 5 2026-05-02 2026-06-30
live.dsti.co 10 2026-07-31 2026-10-09
go.dsti.co 5 2026-05-06 2026-09-04
www.dsti.co 5 2026-05-03 2026-07-01

Programmatic access: API GET /v1/hosts/dsti.co (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/dsti.co.