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 · 283 ms

HostCertsFirst seenLast seenDNS
shopback.com.tw 38 2025-07-30 2026-09-15 ok
*.shopback.com.tw 42 2025-07-30 2026-09-15 —
support.shopback.com.tw 6 2026-06-03 2026-10-01 ok

Programmatic access, with DNS A records: API GET /v1/hosts/shopback.com.tw (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/shopback.com.tw.