Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

8 hosts · 235 ms

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HostCertsFirst seenLast seen
wdsu.com 2 2025-09-09 2026-08-27
*.wdsu.com 2 2025-09-09 2026-08-27
y494.wdsu.com 1 2026-01-06 2026-01-06
sli.wdsu.com 2 2026-03-16 2026-08-16
on.wdsu.com 3 2026-06-29 2026-09-06
storystudio.wdsu.com 1 2026-08-31 2026-08-31
customer.wdsu.com 4 2026-06-08 2026-09-22
tollbit.wdsu.com 26 2026-04-30 2026-10-14

Programmatic access: API GET /v1/hosts/wdsu.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/wdsu.com.