Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

13 hosts · 295 ms

Download CSV
HostCertsFirst seenLast seen
code3.com 9 2026-04-04 2026-09-08
*.code3.com 2 2026-04-04 2026-09-04
hub.code3.com 7 2025-10-09 2026-10-10
www.hub.code3.com 2 2025-10-09 2026-10-10
staging.code3.com 6 2026-05-05 2026-09-20
apbilling.code3.com 4 2026-04-25 2026-06-20
blog.code3.com 6 2026-05-11 2026-09-26
link.code3.com 3 2026-07-16 2026-09-14
hubmcp.code3.com 4 2026-06-12 2026-10-10
dashboards.code3.com 1 2026-07-23 2026-07-23
mta-sts.code3.com 1 2025-12-28 2025-12-28
hubtest.code3.com 4 2026-06-05 2026-10-03
www.code3.com 7 2026-04-23 2026-09-08

Programmatic access: API GET /v1/hosts/code3.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/code3.com.