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.

10 hosts · 283 ms

HostCertsFirst seenLast seenDNS
shippo.com 27 2026-05-11 2026-09-25 ok
*.shippo.com 28 2025-12-24 2026-09-25 —
reporting.shippo.com 3 2026-05-28 2026-07-28 ok
api.shippo.com 4 2026-05-28 2026-09-22 ok
deliver.shippo.com 4 2026-05-28 2026-09-22 ok
rate-calculator.shippo.com 4 2026-05-28 2026-09-22 ok
fsr.shippo.com 3 2025-10-14 2026-09-14 ok
updates.shippo.com 9 2026-04-28 2026-10-05 ok
reports.shippo.com 4 2026-05-28 2026-09-22 ok
try.shippo.com 16 2026-05-09 2026-09-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/shippo.com (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/shippo.com.