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 · 269 ms

HostCertsFirst seenLast seenDNS
shopback.sg 40 2025-06-24 2026-09-08 ok
*.shopback.sg 44 2025-06-24 2026-09-15 —
discover.shopback.sg 2 2026-09-24 2026-09-24 ok
surveys.shopback.sg 2 2025-08-20 2026-07-21 ok
support.shopback.sg 6 2026-06-03 2026-10-01 ok
dev.shopback.sg 2 2026-02-19 2026-07-07 ok
*.dev.shopback.sg 2 2026-02-19 2026-07-07 —

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