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.

7 hosts · 304 ms

HostCertsFirst seenLast seenDNS
dealstream.com 2 2026-04-08 2026-09-08 ok
*.dealstream.com 2 2026-04-08 2026-09-08 —
pea.dealstream.com 10 2026-05-13 2026-09-09 ok
tracking.dealstream.com 5 2026-05-03 2026-08-31 ok
metrics.dealstream.com 8 2026-04-28 2026-08-24 ok
sponsorships.dealstream.com 10 2026-04-18 2026-08-15 ok
tracking.genius.dealstream.com 5 2026-05-08 2026-09-05 ok

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