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 · 276 ms

HostCertsFirst seenLast seenDNS
shippsy.com 27 2026-04-08 2026-09-29 ok
*.shippsy.com 19 2026-04-08 2026-09-29 —
s3.shippsy.com 2 2026-08-25 2026-08-25 ok
staging.shippsy.com 1 2026-09-10 2026-09-10 ok
portal.shippsy.com 1 2026-04-08 2026-04-08 ok
admin.shippsy.com 1 2026-04-08 2026-04-08 ok
help.shippsy.com 5 2026-04-08 2026-07-16 ok
www.shippsy.com 3 2026-04-08 2026-09-26 ok

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