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cf-check

Check an Host is Owned by CloudFlare.

Install

  1. Grab from releases page, or
  2. If you have Go1.18+ compiler installed & configured:
$ go install github.com/dwisiswant0/cf-check@latest

Usage

$ echo "uber.com" | cf-check
34.98.127.226

or

$ cf-check -d <FILE>

Flags

$ cf-check -h
Usage of cf-check:
  -c int
        Set the concurrency level (default: 20)
  -cf
        Show CloudFlare only
  -d    Print domains instead of IP addresses

Workaround

The goal is that you don't need to do a port scan if it's proven that the IP is owned by Cloudflare.

$ subfinder -silent -d uber.com | filter-resolved | cf-check -d | anew | naabu -silent -verify | httpx -silent

License

cf-check is distributed under Apache License 2.0.