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.

3 hosts · 237 ms

HostCertsFirst seenLast seen
spl.co.in 2 2026-08-06 2026-08-06
*.spl.co.in 2 2026-08-06 2026-08-06
rmm.spl.co.in 1 2026-06-29 2026-06-29

Programmatic access: API GET /v1/hosts/spl.co.in (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/spl.co.in.