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.

30 hosts · 429 ms

HostCertsFirst seenLast seenDNS
cynetcorp.com 18 2026-04-30 2026-10-06 ok
*.cynetcorp.com 12 2026-05-15 2026-10-03 —
reverse-marketing-ca.cynetcorp.com 2 2026-08-25 2026-08-25 ok
staging-pre-ra.cynetcorp.com 1 2026-08-27 2026-08-27 ok
chbob.cynetcorp.com 1 2026-10-06 2026-10-06 ok
nexussync.cynetcorp.com 1 2026-08-27 2026-08-27 ok
unsubscribe.cynetcorp.com 5 2026-04-26 2026-08-25 ok
cynetone.cynetcorp.com 3 2026-06-19 2026-08-19 ok
staging.cynetone.cynetcorp.com 3 2026-07-09 2026-09-07 ok
autoconfig.cynetcorp.com 2 2026-08-06 2026-10-06 ok
credentialing.cynetcorp.com 2 2026-08-12 2026-08-12 ok
uat-credentialing.cynetcorp.com 2 2026-08-12 2026-08-12 ok
techbilling.cynetcorp.com 1 2026-10-05 2026-10-05 ok
nexusapi.cynetcorp.com 1 2026-08-14 2026-08-14 ok
refcheck.cynetcorp.com 5 2026-05-07 2026-09-03 ok
aleck.cynetcorp.com 2 2026-02-27 2026-07-30 ok
traveldesk.cynetcorp.com 6 2026-05-11 2026-09-06 ok
helpdesk.cynetcorp.com 6 2026-05-11 2026-09-06 ok
mail.cynetcorp.com 6 2026-04-30 2026-10-06 ok
itadmin.cynetcorp.com 13 2026-05-28 2026-09-23 ok
finauts-ubr.cynetcorp.com 2 2026-09-10 2026-09-10 ok
autodiscover.cynetcorp.com 6 2026-04-30 2026-10-06 ok
labs.cynetcorp.com 4 2026-09-15 2026-09-17 ok
reverse-marketing-us.cynetcorp.com 2 2026-08-25 2026-08-25 ok
aita-uat.cynetcorp.com 1 2026-09-29 2026-09-29 ok
smartcontact.cynetcorp.com 4 2026-07-23 2026-09-21 ok
connect.cynetcorp.com 2 2026-09-24 2026-10-03 ok
switchaudit.cynetcorp.com 1 2026-08-17 2026-08-17 ok
rupert.cynetcorp.com 2 2026-06-02 2026-06-02 ok
www.cynetcorp.com 6 2026-04-30 2026-10-06 ok

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