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.

17 hosts · 340 ms

HostCertsFirst seenLast seenDNS
notification-cdiscount.cdiscount.com 6 2026-02-04 2026-09-19 ok
m3.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
res3.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
t3.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
m4.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
res4.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
t4.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
m5.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
res5.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
t5.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
m6.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
res6.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
t6.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
m7.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
res7.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
t7.notification-cdiscount.cdiscount.com 5 2025-10-13 2026-09-19 ok
www.notification-cdiscount.cdiscount.com 2 2026-02-04 2026-03-11 nxdomain

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