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+# arcline-check — CDN / Transparency Auditor
+
+Checks whether a domain is truly self-hosted or routing through a CDN/cloud
+provider (Cloudflare, Fastly, AWS CloudFront, etc.). Core to the Arcline brand.
+
+## Stack
+- Language: Go
+- Distribution: single static binary (linux/amd64, darwin/arm64, windows/amd64)
+- No runtime dependencies
+
+## Features
+- [ ] Resolve domain → IP
+- [ ] Reverse DNS lookup (PTR record)
+- [ ] ASN / org lookup via ip-api.com or ipinfo.io (self-hosted fallback)
+- [ ] Detect known CDN/cloud CIDR ranges (Cloudflare, Fastly, AWS, GCP, Azure)
+- [ ] HTTP header inspection (CF-Ray, X-Served-By, Via, Server, X-Cache)
+- [ ] Output: clean terminal report (color-coded pass/fail)
+- [ ] Output: --json flag for scripting
+- [ ] --watch flag: re-check every N seconds (useful during DNS migration)
+
+## CLI interface
+```
+arcline-check example.com
+arcline-check example.com --json
+arcline-check example.com --watch 30
+```
+
+## Output format
+```
+$ arcline-check example.com
+
+  domain      example.com
+  resolved    203.0.113.42
+  rdns        server1.arclineit.com
+  asn         AS64496  Example ISP
+  org         Example ISP LLC
+
+  [OK]  not behind a known CDN
+  [OK]  no Cloudflare headers detected
+  [OK]  IP not in AWS/GCP/Azure ranges
+```
+
+## Tasks
+- [ ] Project scaffold (go mod init, cmd/, internal/)
+- [ ] DNS resolution + PTR lookup
+- [ ] ASN lookup (HTTP call to free API, cache result)
+- [ ] CDN CIDR list (embed JSON, update via Makefile)
+- [ ] HTTP header fetch + CDN header detection
+- [ ] Report renderer (color terminal + JSON)
+- [ ] --watch mode
+- [ ] Cross-compile Makefile targets
+- [ ] README with usage examples
+- [ ] GitLab CI: build + release binaries on tag