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.

7 hosts · 358 ms

HostCertsFirst seenLast seenDNS
riganti.com 5 2026-05-08 2026-09-07 ok
mail.riganti.com 1 2025-12-31 2025-12-31 ok
hr.riganti.com 2 2025-11-13 2025-12-15 ok
www.hr.riganti.com 2 2025-11-13 2025-12-15 nxdomain
rig-st.riganti.com 1 2025-11-05 2025-11-05 ok
aut.riganti.com 1 2026-09-09 2026-09-09 ok
www.riganti.com 5 2026-05-08 2026-09-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/riganti.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/riganti.com.