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.

3 hosts · 310 ms

HostCertsFirst seenLast seenDNS
publicdiplomacy.org 4 2026-04-20 2026-08-20 ok
*.publicdiplomacy.org 4 2026-04-20 2026-08-20 —
members.publicdiplomacy.org 17 2025-09-29 2026-09-29 ok

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