check_cidr.py

import ipaddress
from typing import List, Tuple

cidr_blocks = [
"172.31.0.0/16", ......
]

def check_cidr_conflicts(cidr_blocks: List[str]) -> List[Tuple[str, List[str]]]:
    results = []
    
    for i, cidr1 in enumerate(cidr_blocks):
        conflicts = []
        try:
            net1 = ipaddress.ip_network(cidr1)
            
            # Check against all other CIDR blocks
            for j, cidr2 in enumerate(cidr_blocks):
                if i != j:
                    try:
                        net2 = ipaddress.ip_network(cidr2)
                        if net1.overlaps(net2):
                            conflicts.append(cidr2)
                    except ValueError:
                        continue
                        
            results.append((cidr1, conflicts))
        except ValueError as e:
            results.append((cidr1, [f"Invalid CIDR block: {str(e)}"]))
    
    return results

def print_conflict_report(results: List[Tuple[str, List[str]]]) -> None:
    print("\nCIDR Block Overlap Analysis (in original order):")
    print("-" * 50)
    
    for cidr, conflicts in results:
        if isinstance(conflicts, list) and conflicts and conflicts[0].startswith("Invalid"):
            print(f"\nCIDR: {cidr}")
            print(conflicts[0])
        else:
            print(f"\nCIDR: {cidr}")
            if conflicts:
                print("Conflicts with:")
                for conflict in conflicts:
                    print(f"  - {conflict}")
            else:
                print("No conflicts found")
    
    # Summary statistics
    total_cidrs = len(results)
    invalid_cidrs = sum(1 for _, conflicts in results if conflicts and isinstance(conflicts[0], str) and conflicts[0].startswith("Invalid"))
    valid_cidrs = total_cidrs - invalid_cidrs
    cidrs_with_conflicts = sum(1 for _, conflicts in results if conflicts and not (isinstance(conflicts[0], str) and conflicts[0].startswith("Invalid")))
    
    print("\nSummary:")
    print(f"Total CIDR blocks analyzed: {total_cidrs}")
    print(f"Valid CIDR blocks: {valid_cidrs}")
    print(f"Invalid CIDR blocks: {invalid_cidrs}")
    print(f"CIDR blocks with conflicts: {cidrs_with_conflicts}")
    print(f"CIDR blocks without conflicts: {valid_cidrs - cidrs_with_conflicts}")

def main():
    try:
        # Check for conflicts while maintaining original order
        results = check_cidr_conflicts(cidr_blocks)
        
        # Print detailed report
        print_conflict_report(results)
        
    except Exception as e:
        print(f"An error occurred: {str(e)}")

if __name__ == "__main__":
    main()