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.

11 hosts · 221 ms

HostCertsFirst seenLast seenDNS
idla.org 13 2025-06-12 2026-09-26 ok
*.idla.org 12 2026-02-05 2026-09-26 —
experience.idla.org 5 2026-05-01 2026-09-18 ok
mobile.idla.org 2 2025-08-04 2026-07-05 ok
*.mobile.idla.org 2 2025-08-04 2026-07-05 —
bypass.mobile.idla.org 2 2026-04-30 2026-09-30 ok
n8n.idla.org 3 2026-05-22 2026-09-07 ok
ivisions.idla.org 2 2025-06-14 2026-05-15 nxdomain
*.test.idla.org 3 2026-02-05 2026-07-22 —
*.dev.idla.org 3 2026-02-05 2026-07-22 —
www.idla.org 4 2025-06-12 2026-08-02 ok

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