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.

6 hosts · 253 ms

HostCertsFirst seenLast seenDNS
theporter.com.tr 7 2025-07-29 2026-09-24 ok
*.theporter.com.tr 9 2025-07-29 2026-09-24 —
prod.theporter.com.tr 10 2025-07-29 2026-09-23 nodata
*.prod.theporter.com.tr 10 2025-07-29 2026-09-23 —
staging.theporter.com.tr 1 2025-07-29 2025-07-29 servfail
*.staging.theporter.com.tr 1 2025-07-29 2025-07-29 —

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