Security teams need reliable tools to verify IP addresses. The Cloudflare IP checker by Aardwolf Security provides this capability. This bash script checks whether IP addresses fall within Cloudflare’s official ranges.
Modern websites often use Cloudflare’s protection services. Security professionals must identify these protected sites during assessments. The tool solves this common reconnaissance challenge.
Table of Contents
What Is a Cloudflare IP Checker Tool?
A Cloudflare IP checker validates IP addresses against official Cloudflare IP ranges. The tool downloads current IP ranges directly from Cloudflare. Security analysts use these tools for network mapping and reconnaissance.
The checker supports both IPv4 and IPv6 addresses. Multiple input methods allow flexible usage across different scenarios. Real-time data ensures accuracy during security assessments.
Key Features of the IP Range Verification Tool
The Aardwolf Security checker offers comprehensive functionality. Single IP checking verifies individual addresses quickly. Batch processing handles multiple addresses from files or command lines.
Core capabilities include:
- IPv4 and IPv6 support
- Real-time Cloudflare data downloads
- Detailed reporting with colour-coded output
- Error handling for invalid IP formats
The tool provides exit codes for automation integration. Scripts can respond appropriately based on verification results.
How Cybersecurity Reconnaissance Benefits
Cybersecurity reconnaissance requires accurate IP identification. Security teams use this information for threat assessment. The checker helps identify Cloudflare-protected targets during penetration testing.
Network administrators verify their infrastructure protection status. The tool confirms whether services properly utilise Cloudflare’s security features. This verification prevents configuration oversights.
Top pen testing companies rely on accurate IP intelligence. Professional assessments require precise network mapping capabilities.
Installation and Setup Guide
Installation requires minimal system dependencies. The tool needs bash version 4.0 or higher. Curl or wget handles IP range downloads automatically.
Download the script:
wget https://raw.githubusercontent.com/aardwolfsecurityltd/cloudflare-ip-checker/main/cloudflare_checker.shMake executable:
chmod +x cloudflare_checker.shPython3 or ipcalc provides IPv6 support. The script functions without these for IPv4 addresses.
Website IP Checker Usage Examples
The website IP checker accepts various input formats. Single IP verification provides immediate results. Multiple IP checking processes entire lists efficiently.
Check single IP:
./cloudflare_checker.sh 104.16.1.1Check multiple IPs:
./cloudflare_checker.sh 104.16.1.1 8.8.8.8 2606:4700::1Process IP file:
./cloudflare_checker.sh -f ip_list.txtThe tool provides clear, colour-coded output. Green indicates Cloudflare IPs, red shows non-Cloudflare addresses.
Advanced Use Cases for Security Teams
Security professionals integrate the checker into assessment workflows. Log analysis identifies Cloudflare-protected services automatically. The tool processes web server logs efficiently.
Extract and check IPs from logs:
grep -oE '([0-9]{1,3}\.){3}[0-9]{1,3}' access.log | sort -u > ips.txt
./cloudflare_checker.sh -f ips.txtAutomated scripts monitor critical infrastructure protection status. Daily checks ensure services remain properly protected. Network penetration testing services benefit from this automation.
Technical Implementation Details
The script downloads current IP ranges from Cloudflare’s endpoints. IPv4 ranges come from https://www.cloudflare.com/ips-v4. IPv6 ranges use https://www.cloudflare.com/ips-v6.
CIDR range matching provides accurate verification. The tool validates input formats before processing. Python’s ipaddress module handles IPv6 calculations preferentially.
Error codes enable automation integration. Exit code 0 indicates all IPs are Cloudflare-hosted. Code 1 shows mixed results, code 2 indicates format errors.
Benefits for Penetration Testing
Penetration testing companies require accurate target identification. The checker reveals protection mechanisms before testing begins. This knowledge helps shape assessment strategies appropriately.
Professional assessments need comprehensive reconnaissance capabilities. The tool provides essential intelligence about target infrastructure. Security teams make informed decisions based on protection status.
Automated integration streamlines testing workflows. Scripts can adapt approaches based on Cloudflare detection. This flexibility improves assessment efficiency significantly.
Professional Penetration Testing Services
Aardwolf Security provides comprehensive security assessment services. Our expert team combines automated tools with manual testing techniques. We deliver thorough evaluations of your security posture.
Our services include network penetration testing, web application assessments, and infrastructure reviews. Professional security teams use industry-leading tools and methodologies. Contact our specialists to discuss your security requirements.
Ready to enhance your security posture? [Get in touch with our experts](https://aardwolf security.com/contact-us/) for professional penetration testing services tailored to your needs.
Further Reading
- Cloudflare Official IP Ranges – Official source for current IP ranges
- OWASP Testing Guide – Comprehensive web security testing methodology
- NIST Cybersecurity Framework – Industry-standard security framework
- SANS Penetration Testing Resources – Professional testing guidance and best practices
Frequently Asked Questions
What IP ranges does Cloudflare use? Cloudflare maintains official IPv4 and IPv6 ranges published at cloudflare.com/ips. These ranges change periodically as Cloudflare expands infrastructure.
How accurate is the IP checker tool? The tool downloads current ranges directly from Cloudflare’s official endpoints. Accuracy depends on real-time data retrieval and proper IP format validation.
Can the tool check IPv6 addresses? Yes, the checker supports both IPv4 and IPv6 addresses. IPv6 checking requires Python3 or ipcalc for proper CIDR calculations.
Is the tool suitable for automated scripts? The checker provides specific exit codes for automation integration. Scripts can respond appropriately based on verification results returned.
How often should IP ranges be updated? The tool downloads fresh ranges each time it runs. This ensures accuracy without manual intervention or outdated local data.
