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.

38 hosts · 320 ms

HostCertsFirst seenLast seenDNS
brookshires-email.com 6 2026-04-12 2026-09-07 ok
mx20.brookshires-email.com 8 2026-04-13 2026-09-13 ok
www.mx20.brookshires-email.com 3 2026-06-18 2026-09-08 ok
relay2.brookshires-email.com 7 2026-04-12 2026-09-11 ok
www.relay2.brookshires-email.com 3 2026-06-18 2026-09-07 ok
backend.brookshires-email.com 5 2026-05-05 2026-09-21 ok
www.backend.brookshires-email.com 4 2026-06-23 2026-09-10 ok
staging.brookshires-email.com 6 2026-04-14 2026-09-08 ok
www.staging.brookshires-email.com 6 2026-06-18 2026-09-17 ok
api.brookshires-email.com 8 2026-04-11 2026-09-20 ok
www.api.brookshires-email.com 3 2026-06-18 2026-08-17 ok
panel.brookshires-email.com 3 2026-08-13 2026-09-13 ok
www.panel.brookshires-email.com 2 2026-09-13 2026-09-13 ok
mail.brookshires-email.com 5 2026-05-05 2026-09-16 ok
www.mail.brookshires-email.com 4 2026-06-23 2026-09-12 ok
m.brookshires-email.com 6 2026-04-13 2026-09-12 ok
www.m.brookshires-email.com 4 2026-06-17 2026-09-19 ok
cdn.brookshires-email.com 6 2026-05-05 2026-09-13 ok
www.cdn.brookshires-email.com 6 2026-06-18 2026-09-27 ok
login.brookshires-email.com 6 2026-05-05 2026-09-14 ok
www.login.brookshires-email.com 4 2026-06-19 2026-09-15 ok
admin.brookshires-email.com 4 2026-05-05 2026-09-12 ok
www.admin.brookshires-email.com 4 2026-06-18 2026-09-12 ok
server.brookshires-email.com 5 2026-04-13 2026-09-27 ok
www.server.brookshires-email.com 5 2026-06-22 2026-09-10 ok
apps.brookshires-email.com 5 2026-05-05 2026-09-10 ok
www.apps.brookshires-email.com 3 2026-06-22 2026-09-07 ok
mta-sts.brookshires-email.com 7 2026-04-14 2026-09-14 ok
www.mta-sts.brookshires-email.com 5 2026-06-18 2026-09-20 ok
root.brookshires-email.com 7 2026-04-13 2026-09-26 ok
www.root.brookshires-email.com 4 2026-06-22 2026-09-20 ok
test.brookshires-email.com 6 2026-04-11 2026-09-16 ok
www.test.brookshires-email.com 6 2026-06-18 2026-09-13 ok
mailhost.brookshires-email.com 2 2026-09-02 2026-09-15 ok
www.brookshires-email.com 6 2026-04-12 2026-09-07 ok
sandbox.brookshires-email.com 1 2026-10-02 2026-10-02 ok
openpgpkey.brookshires-email.com 5 2026-04-14 2026-09-15 ok
www.openpgpkey.brookshires-email.com 4 2026-06-18 2026-09-10 ok

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