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.

15 hosts · 303 ms

HostCertsFirst seenLast seenDNS
redsift.com 26 2025-12-04 2026-10-04 ok
*.redsift.com 26 2025-12-04 2026-10-04 —
*.ondmarc.redsift.com 12 2026-04-10 2026-10-04 —
get.ondmarc.redsift.com 19 2026-05-23 2026-09-18 ok
blog.redsift.com 17 2026-04-30 2026-08-26 ok
bimi.redsift.com 1 2026-01-06 2026-01-06 nodata
*.bimi.redsift.com 1 2026-01-06 2026-01-06 —
link.redsift.com 3 2026-05-10 2026-08-25 ok
*.ondomain.redsift.com 12 2026-04-10 2026-10-04 —
*.ingrain.redsift.com 12 2026-04-10 2026-10-04 —
hello.redsift.com 7 2026-05-02 2026-10-02 ok
careers.redsift.com 9 2026-06-01 2026-09-20 ok
partners.redsift.com 12 2026-04-22 2026-08-18 ok
*.oninbox.redsift.com 12 2026-04-10 2026-10-04 —
community.redsift.com 12 2026-04-22 2026-08-18 ok

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