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.

7 hosts · 307 ms

HostCertsFirst seenLast seenDNS
ivn.us 22 2026-05-04 2026-10-01 ok
*.ivn.us 7 2026-05-09 2026-09-11 —
bimi.ivn.us 6 2026-06-22 2026-08-20 ok
*.bimi.ivn.us 6 2026-06-22 2026-08-20 —
email.ghost.ivn.us 5 2026-05-19 2026-09-16 ok
www.ivn.us 7 2026-05-04 2026-09-11 ok
email.notify.ivn.us 5 2026-05-14 2026-09-11 ok

Programmatic access, with DNS A records: API GET /v1/hosts/ivn.us (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/ivn.us.