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.

16 hosts · 324 ms

Download CSV
HostCertsFirst seenLast seen
thecoderschool.com 11 2026-05-09 2026-09-07
*.thecoderschool.com 6 2026-06-16 2026-09-04
pasadena.thecoderschool.com 3 2026-06-19 2026-08-19
sf-richmond.thecoderschool.com 3 2026-06-19 2026-08-19
safespace.thecoderschool.com 3 2026-06-19 2026-08-19
eleague.thecoderschool.com 3 2026-06-19 2026-08-19
franchising.thecoderschool.com 3 2026-06-19 2026-08-19
blog.thecoderschool.com 3 2026-06-19 2026-08-19
appstream.thecoderschool.com 3 2026-06-19 2026-08-19
pro.thecoderschool.com 3 2026-06-19 2026-08-19
paloalto.thecoderschool.com 3 2026-06-19 2026-08-19
server.thecoderschool.com 1 2025-11-10 2025-11-10
www.server.thecoderschool.com 1 2025-11-10 2025-11-10
techassessor.thecoderschool.com 10 2026-05-29 2026-09-28
camps.thecoderschool.com 3 2026-06-19 2026-08-19
www.thecoderschool.com 5 2026-05-09 2026-09-07

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