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 · 331 ms

HostCertsFirst seenLast seen
aip-info.org 23 2026-04-22 2026-10-01
*.aip-info.org 11 2026-06-05 2026-10-01
r1.aip-info.org 10 2026-04-21 2026-08-17

Programmatic access: API GET /v1/hosts/aip-info.org (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/aip-info.org.