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.

13 hosts · 271 ms

HostCertsFirst seenLast seenDNS
iaff.org 34 2025-09-19 2026-10-05 ok
*.iaff.org 26 2025-09-19 2026-10-05 —
brand.iaff.org 9 2025-12-17 2026-08-22 ok
impersonate.iaff.org 4 2026-05-14 2026-07-13 ok
apps-staging.iaff.org 1 2026-07-14 2026-07-14 ok
impersonate.staging.iaff.org 4 2026-05-13 2026-07-12 nxdomain
apistaging.iaff.org 4 2026-05-13 2026-07-12 ok
identitystaging.iaff.org 4 2026-05-13 2026-07-12 ok
api.iaff.org 4 2026-05-14 2026-07-13 ok
apps.iaff.org 1 2026-07-20 2026-07-20 ok
smart.iaff.org 1 2025-12-25 2025-12-25 ok
www.iaff.org 12 2026-05-21 2026-09-16 ok
identity.iaff.org 4 2026-05-14 2026-07-13 ok

Programmatic access, with DNS A records: API GET /v1/hosts/iaff.org (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/iaff.org.