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.

7 hosts · 271 ms

HostCertsFirst seenLast seenDNS
vistaprint.sg 15 2025-10-29 2026-09-13 ok
*.vistaprint.sg 13 2026-04-14 2026-09-13 —
links.mail.vistaprint.sg 2 2025-06-18 2026-05-18 ok
partners.vistaprint.sg 2 2026-04-06 2026-09-06 ok
url.t.vistaprint.sg 1 2026-05-04 2026-05-04 ok
www.vistaprint.sg 2 2025-10-29 2025-10-29 ok
gallery.vistaprint.sg 10 2026-04-27 2026-08-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/vistaprint.sg (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/vistaprint.sg.