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.

55 hosts · 316 ms

HostCertsFirst seenLast seenDNS
reasors-email.com 60 2026-04-09 2026-09-15 ok
qa.reasors-email.com 7 2026-04-15 2026-09-22 ok
www.qa.reasors-email.com 6 2026-06-22 2026-09-14 ok
backend.reasors-email.com 8 2026-04-25 2026-09-13 ok
www.backend.reasors-email.com 4 2026-06-19 2026-09-07 ok
dashboard.reasors-email.com 6 2026-04-18 2026-09-10 ok
www.dashboard.reasors-email.com 4 2026-06-19 2026-09-09 ok
stage.reasors-email.com 7 2026-04-25 2026-09-15 ok
www.stage.reasors-email.com 5 2026-06-17 2026-09-17 ok
staging.reasors-email.com 8 2026-04-12 2026-09-11 ok
www.staging.reasors-email.com 5 2026-06-24 2026-09-14 ok
testing.reasors-email.com 8 2026-04-30 2026-09-13 ok
www.testing.reasors-email.com 6 2026-06-19 2026-09-25 ok
blog.reasors-email.com 6 2026-04-25 2026-09-27 ok
www.blog.reasors-email.com 4 2026-06-29 2026-09-11 ok
api.reasors-email.com 6 2026-04-14 2026-09-11 ok
www.api.reasors-email.com 6 2026-06-18 2026-10-01 ok
portal.reasors-email.com 9 2026-04-15 2026-09-15 ok
www.portal.reasors-email.com 4 2026-06-23 2026-09-20 ok
panel.reasors-email.com 8 2026-04-16 2026-09-13 ok
www.panel.reasors-email.com 4 2026-06-22 2026-09-08 ok
mail.reasors-email.com 9 2026-04-15 2026-09-19 ok
www.mail.reasors-email.com 5 2026-06-24 2026-09-29 ok
m.reasors-email.com 7 2026-05-03 2026-09-15 ok
www.m.reasors-email.com 5 2026-06-19 2026-09-17 ok
cdn.reasors-email.com 8 2026-04-30 2026-09-13 ok
www.cdn.reasors-email.com 5 2026-06-17 2026-09-17 ok
login.reasors-email.com 7 2026-05-03 2026-09-22 ok
www.login.reasors-email.com 5 2026-06-18 2026-09-17 ok
admin.reasors-email.com 7 2026-04-13 2026-09-29 ok
www.admin.reasors-email.com 5 2026-06-23 2026-09-16 ok
demo.reasors-email.com 7 2026-04-20 2026-09-08 ok
www.demo.reasors-email.com 6 2026-06-19 2026-09-16 ok
shop.reasors-email.com 8 2026-04-25 2026-09-20 ok
www.shop.reasors-email.com 5 2026-06-18 2026-09-25 ok
app.reasors-email.com 9 2026-04-12 2026-09-15 ok
www.app.reasors-email.com 5 2026-06-18 2026-09-20 ok
docs.reasors-email.com 2 2026-09-30 2026-09-30 ok
cms.reasors-email.com 8 2026-04-18 2026-09-14 ok
www.cms.reasors-email.com 5 2026-06-18 2026-09-24 ok
apps.reasors-email.com 1 2026-09-25 2026-09-25 ok
clients.reasors-email.com 1 2026-09-26 2026-09-26 ok
mta-sts.reasors-email.com 6 2026-04-15 2026-09-14 ok
www.mta-sts.reasors-email.com 5 2026-06-18 2026-09-10 ok
uat.reasors-email.com 7 2026-04-30 2026-09-14 ok
www.uat.reasors-email.com 6 2026-06-17 2026-09-17 ok
client.reasors-email.com 2 2026-08-15 2026-09-15 ok
www.client.reasors-email.com 1 2026-09-10 2026-09-10 ok
test.reasors-email.com 8 2026-04-12 2026-09-21 ok
www.test.reasors-email.com 5 2026-06-24 2026-09-24 ok
dev.reasors-email.com 7 2026-04-16 2026-09-11 ok
www.dev.reasors-email.com 5 2026-06-18 2026-09-10 ok
www.reasors-email.com 8 2026-04-20 2026-09-10 ok
openpgpkey.reasors-email.com 6 2026-04-15 2026-09-15 ok
www.openpgpkey.reasors-email.com 6 2026-06-17 2026-09-17 ok

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