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.

5 hosts · 299 ms

HostCertsFirst seenLast seenDNS
cloud.e.email-td.com 1 2026-02-01 2026-02-01 ok
image.e.email-td.com 3 2025-09-02 2026-08-04 ok
click.e.email-td.com 3 2025-09-08 2026-09-07 ok
pages.e.email-td.com 3 2025-09-04 2026-08-22 ok
view.e.email-td.com 3 2025-09-08 2026-08-26 ok

Programmatic access, with DNS A records: API GET /v1/hosts/e.email-td.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/e.email-td.com.