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 · 331 ms

HostCertsFirst seenLast seenDNS
wacohi.net 5 2026-04-23 2026-09-30 ok
portal.wacohi.net 1 2026-05-26 2026-05-26 ok
www.portal.wacohi.net 1 2026-05-26 2026-05-26 nxdomain
clearpass.wacohi.net 3 2026-04-27 2026-06-04 nxdomain
www.clearpass.wacohi.net 3 2026-04-27 2026-06-04 nxdomain
mta-sts.wacohi.net 4 2026-09-15 2026-09-15 ok
www.wacohi.net 6 2026-06-15 2026-09-23 ok

Programmatic access, with DNS A records: API GET /v1/hosts/wacohi.net (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/wacohi.net.