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.

3 hosts · 231 ms

HostCertsFirst seenLast seen
xtb.pt 3 2025-06-30 2026-07-02
*.xtb.pt 1 2026-02-23 2026-02-23
www.xtb.pt 2 2025-06-30 2026-07-02

Programmatic access: API GET /v1/hosts/xtb.pt (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/xtb.pt.