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.

3 hosts · 284 ms

HostCertsFirst seenLast seenDNS
iobnet.co.in 7 2026-06-30 2026-10-02 ok
*.iobnet.co.in 5 2026-10-01 2026-10-02 —
www.iobnet.co.in 2 2026-06-30 2026-06-30 ok

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