Block a user
ASN / org lookup via ip-api.com or ipinfo.io (self-hosted fallback)
Reverse DNS lookup (PTR record)
Report renderer (terminal + JSON + plain text)
DNS checker module (A, MX, SPF, DKIM, DMARC, DNSSEC)
HTTP header fetcher + security header grader
Project scaffold + shared internal packages (reuse arcline-check logic)
Common ports: 80, 443, 22, 3306, 5432 (report open/closed, don't scan)
CDN detection (reuse arcline-check logic)
IP → ASN / org (via arcline-check internals)