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.

8 hosts · 256 ms

HostCertsFirst seenLast seenDNS
sellerboard.io 12 2025-09-08 2026-10-03 ok
*.sellerboard.io 12 2025-09-08 2026-10-03 —
staging.sellerboard.io 3 2026-09-28 2026-10-04 ok
*.staging.sellerboard.io 3 2026-09-28 2026-10-04 —
app.sellerboard.io 11 2026-05-02 2026-10-04 ok
*.app.sellerboard.io 11 2026-05-02 2026-10-04 —
d.ltv.sellerboard.io 10 2026-05-19 2026-10-04 nodata
*.d.ltv.sellerboard.io 10 2026-05-19 2026-10-04 —

Programmatic access, with DNS A records: API GET /v1/hosts/sellerboard.io (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/sellerboard.io.