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.

10 hosts · 279 ms

HostCertsFirst seenLast seenDNS
alignable.com 1 2026-01-05 2026-01-05 ok
*.alignable.com 2 2025-09-03 2026-08-03 —
stayingaligned.alignable.com 5 2026-05-02 2026-08-30 ok
marketing.alignable.com 4 2026-04-14 2026-08-16 ok
groupsfinder.alignable.com 8 2026-05-06 2026-09-01 ok
partner.alignable.com 18 2026-05-06 2026-09-01 ok
links.alignable.com 2 2025-08-22 2026-07-22 ok
careers.alignable.com 8 2026-04-15 2026-08-11 ok
assets.alignable.com 1 2026-05-09 2026-05-09 ok
support.alignable.com 5 2026-05-03 2026-08-31 ok

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