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.

27 hosts · 349 ms

HostCertsFirst seenLast seenDNS
copytrack.com 6 2026-01-27 2026-09-27 ok
kibana.copytrack.com 5 2026-05-16 2026-09-15 ok
evidence.copytrack.com 4 2026-04-19 2026-08-17 ok
eos-stage.copytrack.com 6 2026-06-02 2026-09-30 ok
api.copytrack.com 2 2025-10-07 2026-09-06 ok
system.api.copytrack.com 2 2025-10-07 2026-09-06 ok
partner.api.copytrack.com 2 2025-10-07 2026-09-06 ok
agent.api.copytrack.com 1 2026-07-29 2026-07-29 ok
portal.copytrack.com 6 2026-04-15 2026-08-30 ok
esl.copytrack.com 5 2026-05-19 2026-09-16 ok
cdn.copytrack.com 5 2026-05-21 2026-09-18 ok
cerebro.copytrack.com 5 2026-05-19 2026-09-16 ok
help.copytrack.com 2 2025-06-20 2026-05-20 ok
app.copytrack.com 5 2026-05-01 2026-08-30 ok
ftp.copytrack.com 148 2026-04-12 2026-10-07 ok
sftp.copytrack.com 146 2026-04-10 2026-10-06 ok
faq.copytrack.com 5 2026-05-27 2026-09-24 ok
letter-mailer.copytrack.com 4 2026-06-06 2026-10-05 ok
importer.copytrack.com 5 2026-05-10 2026-09-07 ok
calculator.copytrack.com 5 2026-05-31 2026-09-28 ok
es.copytrack.com 5 2026-05-20 2026-09-17 ok
logs.copytrack.com 5 2026-05-19 2026-09-16 ok
whois.copytrack.com 5 2026-05-31 2026-09-28 ok
eos.copytrack.com 6 2026-06-02 2026-09-30 ok
webdev.copytrack.com 5 2026-05-21 2026-09-18 ok
www.copytrack.com 6 2026-01-27 2026-09-27 ok
apigateway.copytrack.com 4 2026-04-13 2026-08-11 ok

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