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.

4 hosts · 302 ms

HostCertsFirst seenLast seenDNS
adafruitdaily.com 14 2025-07-03 2026-10-01 ok
*.adafruitdaily.com 12 2026-04-19 2026-10-01 —
makecode.adafruitdaily.com 5 2026-05-01 2026-08-30 ok
www.adafruitdaily.com 2 2025-07-03 2026-07-08 ok

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