2022-08-30 06:17:13 -04:00
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# How to Block Cloudflare
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## with Firewall
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This page show you how to block CloudFlare websites with your firewall, preventing from connecting to them.
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### With UFW
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```
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ufw deny from 103.21.244.0/22
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ufw deny from 103.22.200.0/22
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ufw deny from 103.31.4.0/22
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ufw deny from 104.16.0.0/13
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ufw deny from 104.24.0.0/14
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ufw deny from 108.162.192.0/18
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ufw deny from 131.0.72.0/22
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ufw deny from 141.101.64.0/18
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ufw deny from 162.158.0.0/15
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ufw deny from 172.64.0.0/13
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ufw deny from 173.245.48.0/20
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ufw deny from 188.114.96.0/20
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ufw deny from 190.93.240.0/20
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ufw deny from 197.234.240.0/22
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ufw deny from 198.41.128.0/17
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ufw deny from 2400:cb00::/32
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ufw deny from 2405:8100::/32
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ufw deny from 2405:b500::/32
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ufw deny from 2606:4700::/32
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ufw deny from 2803:f800::/32
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ufw deny from 2a06:98c0::/29
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ufw deny from 2c0f:f248::/32
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```
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### With iptables
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```
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iptables -A input -s 103.21.244.0/22 -j DROP
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iptables -A input -s 103.22.200.0/22 -j DROP
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iptables -A input -s 103.31.4.0/22 -j DROP
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iptables -A input -s 104.16.0.0/13 -j DROP
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iptables -A input -s 104.24.0.0/14 -j DROP
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iptables -A input -s 108.162.192.0/18 -j DROP
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iptables -A input -s 131.0.72.0/22 -j DROP
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iptables -A input -s 141.101.64.0/18 -j DROP
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iptables -A input -s 162.158.0.0/15 -j DROP
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iptables -A input -s 172.64.0.0/13 -j DROP
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iptables -A input -s 173.245.48.0/20 -j DROP
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iptables -A input -s 188.114.96.0/20 -j DROP
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iptables -A input -s 190.93.240.0/20 -j DROP
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iptables -A input -s 197.234.240.0/22 -j DROP
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iptables -A input -s 198.41.128.0/17 -j DROP
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iptables -A input -s 2400:cb00::/32 -j DROP
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iptables -A input -s 2405:8100::/32 -j DROP
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iptables -A input -s 2405:b500::/32 -j DROP
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iptables -A input -s 2606:4700::/32 -j DROP
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iptables -A input -s 2803:f800::/32 -j DROP
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iptables -A input -s 2a06:98c0::/29 -j DROP
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iptables -A input -s 2c0f:f248::/32 -j DROP
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```
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### With Windows Firewall
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```
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 103.21.244.0/22
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 103.22.200.0/22
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 103.31.4.0/22
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 104.16.0.0/13
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 104.24.0.0/14
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 108.162.192.0/18
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 131.0.72.0/22
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 141.101.64.0/18
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 162.158.0.0/15
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 172.64.0.0/13
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 173.245.48.0/20
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 188.114.96.0/20
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 190.93.240.0/20
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 197.234.240.0/22
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 198.41.128.0/17
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2400:cb00::/32
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2405:8100::/32
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2405:b500::/32
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2606:4700::/32
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2803:f800::/32
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2a06:98c0::/29
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New-NetFirewallRule -DisplayName "Block CF" -Direction Outbound –LocalPort Any -Action Block -RemoteAddress 2c0f:f248::/32
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```
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