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.

6 hosts · 390 ms

HostCertsFirst seenLast seenDNS
usecache.com 4 2025-08-13 2026-08-26 ok
*.usecache.com 1 2026-02-14 2026-02-14 —
squire.usecache.com 2 2026-06-11 2026-06-11 ok
to.usecache.com 8 2026-04-21 2026-08-17 ok
emails.usecache.com 2 2025-09-25 2026-08-26 ok
mkt.usecache.com 14 2026-04-16 2026-08-13 ok

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