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.

6 hosts · 368 ms

HostCertsFirst seenLast seenDNS
mpe.support 6 2025-07-10 2026-09-11 ok
*.mpe.support 5 2026-07-11 2026-09-11 —
ai.mpe.support 4 2026-07-12 2026-07-22 ok
mail.mpe.support 1 2026-09-20 2026-09-20 ok
webmail.mpe.support 1 2026-09-20 2026-09-20 nxdomain
www.mpe.support 1 2025-07-10 2025-07-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mpe.support (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/mpe.support.