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.

41 hosts · 332 ms

HostCertsFirst seenLast seenDNS
crosscert.com 8 2025-07-03 2026-07-08 ok
*.crosscert.com 13 2025-07-03 2026-09-23 —
fidoserver2.crosscert.com 2 2025-07-03 2026-07-16 ok
test2.crosscert.com 1 2025-10-23 2025-10-23 ok
iotca.crosscert.com 2 2026-02-23 2026-02-23 ok
mydata-qa.crosscert.com 1 2026-06-23 2026-06-23 ok
crmra.crosscert.com 2 2026-04-08 2026-09-30 ok
mydata.crosscert.com 1 2026-06-23 2026-06-23 ok
dev-mydata.crosscert.com 1 2025-11-12 2025-11-12 ok
g2b.crosscert.com 2 2025-07-11 2026-07-20 ok
browsersigncache.crosscert.com 2 2025-07-11 2026-07-20 ok
clmlicense.crosscert.com 1 2026-09-10 2026-09-10 ok
global.crosscert.com 5 2026-05-02 2026-08-30 ok
ccmpkicrl.crosscert.com 2 2025-07-11 2025-09-04 ok
m.crosscert.com 2 2025-07-11 2026-07-20 ok
autoclm.crosscert.com 1 2026-09-09 2026-09-09 ok
msign.crosscert.com 2 2025-07-03 2026-07-16 ok
out2in.crosscert.com 2 2025-08-29 2026-06-25 nxdomain
dev2in.crosscert.com 2 2025-08-29 2026-06-25 nxdomain
raadmin.crosscert.com 2 2025-06-11 2026-06-19 ok
msignadmin.crosscert.com 2 2025-07-03 2026-07-16 ok
iotadmin.crosscert.com 2 2025-06-23 2026-07-06 ok
solution.crosscert.com 7 2026-05-02 2026-09-23 ok
kbfido.crosscert.com 2 2025-07-03 2026-07-16 ok
poscowebcmp.crosscert.com 2 2025-07-03 2026-07-16 ok
authiar.crosscert.com 1 2025-10-31 2025-10-31 ok
order.crosscert.com 1 2026-06-05 2026-06-05 ok
admin.order.crosscert.com 1 2026-06-05 2026-06-05 ok
authias.crosscert.com 1 2026-02-19 2026-02-19 ok
authtoss.crosscert.com 2 2025-07-03 2026-07-16 ok
certtoss.crosscert.com 1 2026-04-08 2026-04-08 ok
direct.crosscert.com 2 2025-07-11 2026-07-20 ok
cert.crosscert.com 4 2025-08-22 2026-09-23 ok
test.crosscert.com 5 2025-10-02 2026-03-04 nodata
waftest.crosscert.com 6 2026-06-10 2026-07-08 ok
in2out.crosscert.com 3 2025-08-29 2026-09-02 nxdomain
dev2out.crosscert.com 2 2025-08-29 2026-06-25 nxdomain
in2dev.crosscert.com 2 2025-08-29 2026-06-25 nxdomain
out2dev.crosscert.com 2 2025-08-29 2026-06-25 nxdomain
www.crosscert.com 2 2025-12-23 2025-12-23 ok
mob-key.crosscert.com 1 2026-01-14 2026-01-14 ok

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