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 · 356 ms

HostCertsFirst seenLast seenDNS
fannilla.com 6 2026-05-05 2026-10-02 ok
prod.fannilla.com 4 2026-06-30 2026-10-02 ok
delivery.billing.fannilla.com 3 2026-05-09 2026-08-26 ok
blog.fannilla.com 4 2026-06-30 2026-10-02 ok
prod.blog.fannilla.com 4 2026-06-30 2026-10-02 ok
delivery.newsletter.fannilla.com 5 2026-04-10 2026-09-21 ok
delivery.updates.fannilla.com 3 2026-05-14 2026-09-06 ok
delivery.promotions.fannilla.com 5 2026-04-10 2026-09-23 ok
careers.fannilla.com 4 2026-06-30 2026-10-02 ok
prod.careers.fannilla.com 4 2026-06-30 2026-10-02 ok
delivery.accounts.fannilla.com 4 2026-06-02 2026-09-19 ok
cdn-pb-us.fannilla.com 4 2026-06-30 2026-10-02 ok
cdn-pr-us.fannilla.com 4 2026-06-30 2026-10-02 ok
optimus.fannilla.com 1 2026-08-17 2026-08-17 ok
cdn-pb-eu.fannilla.com 4 2026-06-30 2026-10-02 ok
cdn-pr-eu.fannilla.com 4 2026-06-30 2026-10-02 ok
www.fannilla.com 6 2026-05-05 2026-10-02 ok

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