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.

14 hosts · 220 ms

HostCertsFirst seenLast seenDNS
redsift.io 12 2025-12-04 2026-08-31 ok
*.redsift.io 12 2025-12-04 2026-08-31 —
radar-infra.redsift.io 1 2026-08-20 2026-08-20 ok
sync.redsift.io 1 2025-12-04 2025-12-04 ok
*.sync.redsift.io 1 2025-12-04 2025-12-04 —
radar-lite.redsift.io 3 2026-06-20 2026-09-03 ok
link.redsift.io 3 2026-05-13 2026-08-28 ok
hello.redsift.io 7 2026-05-02 2026-10-02 ok
mcp.redsift.io 3 2026-06-20 2026-09-03 ok
hardenize.app.redsift.io 5 2026-05-14 2026-09-11 ok
radar.redsift.io 4 2026-04-09 2026-08-14 ok
mcp-ts.redsift.io 3 2026-05-25 2026-08-08 ok
nodmarc-export.redsift.io 5 2026-04-18 2026-09-29 ok
eagle-dev.redsift.io 3 2026-06-24 2026-09-16 ok

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