CrimsonCF (CrimsonCloudFlare) is a fast Cloudflare IP scanner web app that tests endpoints using Layer 4 (TCP handshake) (not HTTPS), keeps scan history, exports clean newline TXT lists, and generates ready-to-import configs for Xray-core, sing-box, and Clash.
If you searched for: cloudflare ip scanner, cloudflare ip range scanner, cloudflare tunnel ip scanner, warp ip scanner, fastest cloudflare ip, this repo is built for that workflow.
- L4 handshake probing (TCP connect latency + open/closed)
- Parallel scanning (configurable concurrency)
- IP range groups + paging: CDN / Tunnel / WARP / Custom / All
- Sources: fetch ranges from URLs/APIs, presets for Cloudflare official lists
- Results filters + capability tags (CDN/Tunnel/WARP/BPB heuristics)
- Exports:
- TXT (one IP per line, real newlines)
- JSON/XLSX tables
- Proxy configs: Xray, sing-box, Clash (YAML/JSON)
- Cloudflare DNS tab: push fastest IPs into A records automatically (replace mode)
This runs the UI + probe server in one container.
docker compose up -dOpen:
http://localhost:8080
Many Cloudflare IPs won’t complete HTTPS the way you expect (SNI/certs/ciphers). CrimsonCF uses TCP handshake tests to reliably measure reachability/latency.
README.fa.md
Built by github.com/amir0zx with help from OpenAI ChatGPT (Codex).
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