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 · 363 ms

HostCertsFirst seenLast seenDNS
affinity.studio 28 2026-04-19 2026-09-14 ok
*.affinity.studio 18 2026-04-27 2026-09-14 —
l.engage.affinity.studio 6 2026-05-07 2026-09-02 ok
sdk.affinity.studio 1 2026-09-08 2026-09-08 ok
downloads.affinity.studio 2 2025-10-10 2026-09-10 ok
content-management-files.affinity.studio 11 2026-05-31 2026-09-26 ok
ct.affinity.studio 7 2026-04-16 2026-09-24 ok
braze-import.affinity.studio 2 2026-08-25 2026-08-25 ok
support.affinity.studio 4 2026-06-04 2026-10-02 ok
www.affinity.studio 10 2026-04-19 2026-08-15 ok

Programmatic access, with DNS A records: API GET /v1/hosts/affinity.studio (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/affinity.studio.