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.

3 hosts · 259 ms

HostCertsFirst seenLast seenDNS
abrasives.com 8 2025-08-19 2026-09-15 ok
*.abrasives.com 7 2026-03-25 2026-09-15 —
www.abrasives.com 6 2025-08-19 2026-09-07 ok

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