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.

7 hosts · 294 ms

HostCertsFirst seenLast seen
spiking.com 10 2026-05-09 2026-09-05
*.spiking.com 10 2026-05-09 2026-09-05
tool.spiking.com 5 2026-05-10 2026-09-07
join.spiking.com 3 2026-06-02 2026-08-31
registry-do.spiking.com 3 2026-07-04 2026-10-02
ch-stocks.spiking.com 5 2026-05-27 2026-09-24
postiz.spiking.com 5 2026-04-28 2026-08-27

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