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 · 415 ms

HostCertsFirst seenLast seenDNS
spend.com 18 2026-04-30 2026-09-26 ok
*.spend.com 12 2026-05-15 2026-09-26 —
blog.spend.com 10 2026-05-25 2026-09-21 ok
uk.spend.com 4 2026-04-09 2026-08-14 ok
www.spend.com 5 2026-04-29 2026-08-31 ok

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