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.

5 hosts · 193 ms

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HostCertsFirst seenLast seen
alphanovel.io 23 2026-04-20 2026-09-15
*.alphanovel.io 23 2026-04-20 2026-09-15
click.alphanovel.io 13 2026-05-03 2026-08-29
admin.alphanovel.io 5 2026-05-15 2026-09-09
quiz.alphanovel.io 2 2026-09-30 2026-10-07

Programmatic access: API GET /v1/hosts/alphanovel.io (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/alphanovel.io.