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.

4 hosts · 238 ms

HostCertsFirst seenLast seenDNS
email.mg.qa.yembomail.com 5 2026-05-14 2026-09-11 ok
email.mg.prod.yembomail.com 5 2026-05-14 2026-09-11 ok
email.mg.staging.yembomail.com 5 2026-05-14 2026-09-11 ok
email.mg.dev.yembomail.com 5 2026-05-14 2026-09-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/yembomail.com (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/yembomail.com.