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.

4 hosts · 309 ms

HostCertsFirst seenLast seen
boardkingsgame.com 2 2025-11-17 2026-09-23
*.boardkingsgame.com 1 2025-11-17 2025-11-17
messaging-dsa.boardkingsgame.com 5 2026-06-23 2026-09-10
s3repo.boardkingsgame.com 5 2026-06-23 2026-09-10

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