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 · 233 ms

HostCertsFirst seenLast seenDNS
sales-faqbot.ai-operation-system.com 3 2025-12-26 2026-01-22 ok
*.sales-faqbot.ai-operation-system.com 2 2025-12-26 2026-01-22 —
dashbord.sales-faqbot.ai-operation-system.com 2 2026-01-06 2026-01-20 ok
api.sales-faqbot.ai-operation-system.com 3 2025-12-24 2026-01-22 ok
*.api.sales-faqbot.ai-operation-system.com 2 2025-12-24 2026-01-22 —
operation.sales-faqbot.ai-operation-system.com 3 2025-12-30 2026-01-22 ok
*.operation.sales-faqbot.ai-operation-system.com 2 2025-12-30 2026-01-22 —

Programmatic access, with DNS A records: API GET /v1/hosts/sales-faqbot.ai-operation-system.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/sales-faqbot.ai-operation-system.com.