Find every subdomain
of a domain.

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

5 hosts · 317 ms

HostCertsFirst seenLast seenDNS
yoy.com.ar 2 2026-02-18 2026-04-07 servfail
app.yoy.com.ar 13 2026-05-05 2026-08-31 servfail
newsletter.yoy.com.ar 9 2025-08-12 2026-07-14 servfail
*.newsletter.yoy.com.ar 9 2025-08-12 2026-07-14 —
www.yoy.com.ar 2 2026-02-18 2026-04-07 servfail

Programmatic access, with DNS A records: API GET /v1/hosts/yoy.com.ar (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/yoy.com.ar.