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.

5 hosts · 270 ms

HostCertsFirst seenLast seen
prnews.io 19 2026-05-08 2026-10-02
*.prnews.io 19 2026-05-08 2026-10-02
tracking.prnews.io 3 2026-06-17 2026-09-02
product.prnews.io 10 2026-04-16 2026-08-13
u.prnews.io 5 2026-05-24 2026-09-21

Programmatic access: API GET /v1/hosts/prnews.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/prnews.io.