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.

20 hosts · 360 ms

HostCertsFirst seenLast seenDNS
sunny.com 9 2026-04-15 2026-09-17 ok
*.sunny.com 5 2026-06-01 2026-09-29 —
*.id.sunny.com 5 2026-05-20 2026-09-17 —
guarantee.sunny.com 6 2026-05-08 2026-07-06 ok
staging.sunny.com 5 2026-05-19 2026-09-16 ok
api-staging.sunny.com 5 2026-04-23 2026-09-29 ok
ai.staging.sunny.com 4 2026-04-11 2026-08-09 ok
login.staging.sunny.com 5 2026-04-29 2026-08-27 ok
www.staging.sunny.com 5 2026-05-19 2026-09-16 ok
ai.sunny.com 5 2026-04-24 2026-08-22 ok
*.ai.sunny.com 5 2026-06-01 2026-09-29 —
api.sunny.com 5 2026-04-24 2026-10-05 ok
lock.sunny.com 4 2026-05-03 2026-07-01 ok
link.sunny.com 5 2026-05-26 2026-09-21 ok
login.sunny.com 5 2026-04-29 2026-08-27 ok
go.sunny.com 13 2026-06-01 2026-09-27 ok
units.sunny.com 12 2026-05-30 2026-07-28 ok
agents.sunny.com 9 2026-05-26 2026-07-24 ok
support.sunny.com 3 2026-06-08 2026-08-07 ok
www.sunny.com 9 2026-04-15 2026-09-17 ok

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