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.

9 hosts · 402 ms

HostCertsFirst seenLast seenDNS
skyward.com 2 2025-06-17 2026-02-23 ok
*.skyward.com 2 2025-06-17 2026-02-23 —
help-be.skyward.com 4 2026-01-19 2026-08-28 nxdomain
link.skyward.com 5 2026-05-28 2026-09-25 ok
go.skyward.com 9 2026-04-09 2026-09-06 ok
help.skyward.com 6 2025-12-11 2026-09-08 ok
trustcenter.skyward.com 1 2026-09-09 2026-09-09 ok
downloads.skyward.com 4 2026-05-21 2026-07-30 ok
community.skyward.com 5 2026-05-19 2026-09-15 ok

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