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 · 212 ms

HostCertsFirst seenLast seenDNS
cloud.mail09.bell.bank 3 2025-09-07 2026-08-25 ok
image.mail09.bell.bank 3 2026-01-27 2026-02-22 ok
click.mail09.bell.bank 3 2025-09-07 2026-08-25 ok
view.mail09.bell.bank 3 2025-09-07 2026-08-31 ok

Programmatic access, with DNS A records: API GET /v1/hosts/mail09.bell.bank (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/mail09.bell.bank.