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.

11 hosts · 335 ms

HostCertsFirst seenLast seenDNS
e3.btfinancialgroup.com 5 2026-05-07 2026-09-04 ok
cloud.e.btfinancialgroup.com 1 2025-11-05 2025-11-05 ok
image.e.btfinancialgroup.com 3 2026-01-08 2026-09-29 ok
click.e.btfinancialgroup.com 1 2025-11-05 2025-11-05 ok
pages.e.btfinancialgroup.com 1 2025-11-05 2025-11-05 ok
view.e.btfinancialgroup.com 1 2025-11-05 2025-11-05 ok
data.emsg.btfinancialgroup.com 2 2026-06-01 2026-06-01 ok
cdn.emsg.btfinancialgroup.com 3 2026-06-01 2026-06-23 ok
data.msgs.btfinancialgroup.com 2 2026-05-28 2026-05-29 ok
cdn.msgs.btfinancialgroup.com 5 2026-05-28 2026-06-23 ok
comms.ecomms.btfinancialgroup.com 5 2026-05-03 2026-08-31 ok

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