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.

6 hosts · 270 ms

HostCertsFirst seenLast seen
04510.jp 1 2025-11-10 2025-11-10
*.04510.jp 1 2025-11-10 2025-11-10
qdzqgm.04510.jp 4 2026-05-14 2026-09-19
columns.04510.jp 5 2026-06-01 2026-09-29
agent.04510.jp 2 2025-09-10 2026-08-11
a8cv.04510.jp 9 2026-05-14 2026-09-10

Programmatic access: API GET /v1/hosts/04510.jp (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/04510.jp.