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 · 263 ms

HostCertsFirst seenLast seenDNS
https.in 2 2026-01-30 2026-02-23 ok
*.https.in 1 2026-01-30 2026-01-30 —
link.https.in 5 2026-05-12 2026-09-09 ok
dns.https.in 5 2026-05-05 2026-09-05 nxdomain
www.https.in 2 2026-02-23 2026-02-23 ok

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