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 · 402 ms

HostCertsFirst seenLast seenDNS
honorvettech.com 16 2026-04-20 2026-09-28 ok
*.honorvettech.com 7 2026-05-03 2026-09-28 —
learn.honorvettech.com 8 2026-04-24 2026-08-19 ok
smart.honorvettech.com 4 2026-06-06 2026-10-04 ok
www.honorvettech.com 9 2026-04-20 2026-09-17 ok

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