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.

9 hosts · 277 ms

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HostCertsFirst seenLast seen
genuine.support 9 2026-05-07 2026-10-04
webdisk.genuine.support 4 2026-06-20 2026-10-20
cpanel.genuine.support 4 2026-06-20 2026-10-20
mail.genuine.support 4 2026-06-20 2026-10-20
webmail.genuine.support 4 2026-06-20 2026-10-20
cpcalendars.genuine.support 4 2026-06-20 2026-10-20
cpcontacts.genuine.support 4 2026-06-20 2026-10-20
mta-sts.genuine.support 4 2026-05-11 2026-08-02
www.genuine.support 4 2026-06-20 2026-10-20

Programmatic access: API GET /v1/hosts/genuine.support (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/genuine.support.