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.

36 hosts · 331 ms

HostCertsFirst seenLast seenDNS
rosyblueusa.com 8 2026-04-12 2026-09-09 ok
sandbox-api-use2.rosyblueusa.com 3 2026-05-23 2026-08-17 ok
api-use1-qa.rosyblueusa.com 3 2026-05-27 2026-09-08 ok
owa.rosyblueusa.com 4 2026-04-16 2026-09-26 ok
web.rosyblueusa.com 9 2026-04-10 2026-09-08 ok
api-euw2-preprod.rosyblueusa.com 4 2026-05-27 2026-09-18 ok
backoffice.rosyblueusa.com 1 2026-08-14 2026-08-14 ok
exchange.rosyblueusa.com 7 2026-04-13 2026-09-17 ok
remote.rosyblueusa.com 7 2026-04-25 2026-09-17 ok
staging.rosyblueusa.com 6 2026-04-13 2026-09-15 ok
debug.rosyblueusa.com 3 2026-07-18 2026-09-29 ok
api.rosyblueusa.com 7 2026-04-16 2026-09-24 ok
prod-api.rosyblueusa.com 5 2026-05-27 2026-09-27 ok
dev-app-global.rosyblueusa.com 4 2026-05-27 2026-09-13 ok
lyncdiscoverinternal.rosyblueusa.com 5 2026-04-16 2026-10-01 ok
portal.rosyblueusa.com 6 2026-04-18 2026-10-01 ok
adminpanel.rosyblueusa.com 3 2026-07-18 2026-09-14 ok
mail.rosyblueusa.com 7 2026-04-14 2026-09-14 ok
webmail.rosyblueusa.com 7 2026-04-16 2026-09-19 ok
email.rosyblueusa.com 10 2026-04-11 2026-09-21 ok
m.rosyblueusa.com 9 2026-04-22 2026-09-23 ok
admin.rosyblueusa.com 1 2026-08-24 2026-08-24 ok
api-euc1-demo.rosyblueusa.com 4 2026-05-27 2026-08-15 ok
shop.rosyblueusa.com 2 2026-07-18 2026-08-24 ok
app.rosyblueusa.com 7 2026-04-25 2026-09-14 ok
swagger.rosyblueusa.com 2 2026-07-18 2026-08-25 ok
server.rosyblueusa.com 6 2026-04-13 2026-09-25 ok
assets.rosyblueusa.com 2 2026-07-18 2026-08-15 ok
mta-sts.rosyblueusa.com 2 2026-07-19 2026-08-24 ok
connect.rosyblueusa.com 6 2026-04-17 2026-09-03 ok
test.rosyblueusa.com 9 2026-04-10 2026-09-27 ok
api-prod-eu.rosyblueusa.com 4 2026-05-27 2026-09-20 ok
dev.rosyblueusa.com 5 2026-04-10 2026-09-10 ok
www.rosyblueusa.com 7 2026-04-12 2026-09-12 ok
sandbox.rosyblueusa.com 3 2026-07-18 2026-08-31 ok
gateway.rosyblueusa.com 8 2026-04-09 2026-09-30 ok

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