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.

4 hosts · 316 ms

HostCertsFirst seenLast seen
protalusmarketing.com 1 2026-04-05 2026-04-05
www.protalusmarketing.com 1 2026-04-10 2026-04-10
pay.protalusmarketing.com 1 2025-10-19 2025-10-19
www.pay.protalusmarketing.com 1 2025-10-19 2025-10-19

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