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 · 252 ms

HostCertsFirst seenLast seenDNS
torontolife.com 36 2025-06-26 2026-10-04 ok
*.torontolife.com 36 2025-06-26 2026-10-04 —
link.torontolife.com 4 2026-04-19 2026-08-17 ok
tickets.torontolife.com 12 2026-05-17 2026-09-12 ok

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