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.

17 hosts · 316 ms

HostCertsFirst seenLast seenDNS
siftscience.com 12 2025-10-20 2026-10-04 ok
*.siftscience.com 2 2026-02-09 2026-08-27 —
scim01.siftscience.com 5 2026-06-02 2026-09-29 ok
api3.siftscience.com 2 2025-10-20 2026-08-27 ok
b.siftscience.com 2 2025-10-20 2026-08-27 ok
console.siftscience.com 2 2025-10-20 2026-08-27 ok
engineering.siftscience.com 19 2026-05-11 2026-09-21 ok
blog.siftscience.com 12 2026-04-11 2026-10-05 ok
api.siftscience.com 2 2025-10-20 2026-08-27 ok
partner.siftscience.com 2 2025-10-20 2026-08-27 ok
resources.siftscience.com 11 2026-04-11 2026-10-05 ok
pages.siftscience.com 8 2026-05-08 2026-09-03 ok
notifications.siftscience.com 13 2026-04-11 2026-10-05 ok
alerts.siftscience.com 15 2026-04-11 2026-10-06 ok
status.siftscience.com 6 2026-04-30 2026-09-02 ok
trust.siftscience.com 12 2026-06-08 2026-10-05 ok
www.siftscience.com 16 2025-10-20 2026-10-04 ok

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