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 · 244 ms

HostCertsFirst seenLast seen
prl.res.in 10 2026-04-21 2026-08-16
*.prl.res.in 11 2026-04-21 2026-08-31
lan.prl.res.in 1 2025-09-02 2025-09-02
*.lan.prl.res.in 2 2025-09-02 2026-08-28
cdn.prl.res.in 1 2026-01-30 2026-01-30
forms.prl.res.in 64 2026-06-12 2026-08-12

Programmatic access: API GET /v1/hosts/prl.res.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/prl.res.in.