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.

6 hosts · 220 ms

HostCertsFirst seenLast seenDNS
*.web.nos.pt 8 2026-07-07 2026-09-04 —
cloud.web.nos.pt 16 2026-01-06 2026-09-14 ok
image.web.nos.pt 5 2026-01-14 2026-07-27 ok
click.web.nos.pt 20 2026-01-22 2026-09-14 ok
pages.web.nos.pt 12 2026-06-06 2026-10-02 ok
view.web.nos.pt 19 2026-01-22 2026-09-14 ok

Programmatic access, with DNS A records: API GET /v1/hosts/web.nos.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/web.nos.pt.