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.

9 hosts · 284 ms

HostCertsFirst seenLast seenDNS
buzzair.com 4 2026-03-03 2026-08-19 ok
onlineform.buzzair.com 3 2025-10-24 2026-09-29 ok
oat-onlineform.buzzair.com 3 2025-10-24 2026-09-29 nxdomain
uat-onlineform.buzzair.com 3 2025-10-24 2026-09-29 nxdomain
sit-onlineform.buzzair.com 3 2025-10-24 2026-09-29 ok
dev-onlineform.buzzair.com 3 2025-10-24 2026-09-29 nxdomain
news.buzzair.com 1 2025-11-17 2025-11-17 nxdomain
oat-news.buzzair.com 1 2025-11-17 2025-11-17 nxdomain
www.buzzair.com 4 2026-03-03 2026-08-19 ok

Programmatic access, with DNS A records: API GET /v1/hosts/buzzair.com (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/buzzair.com.