Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

5 hosts · 285 ms

HostCertsFirst seenLast seenDNS
rksv.in 3 2026-04-20 2026-09-20 ok
*.rksv.in 5 2026-04-20 2026-09-24 —
*.prod.rksv.in 2 2026-04-24 2026-09-24 —
updialer.rksv.in 2 2026-08-12 2026-08-12 nxdomain
www.updialer.rksv.in 2 2026-08-12 2026-08-12 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/rksv.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/rksv.in.