vigor2920 block https facebook

只要 使用URL內容過濾器的 taget ip  31.13.0.0   ==>mask 是 255.255.0.0

from http://kb.kerio.com/product/kerio-control/content-filtering/how-to-block-facebook-789.html

Following IP address ranges are known to be used by Facebook:

• 66.220.144.0 - 66.220.159.255 (66.220.144.0/20)(66.220.140.0/255.255.240.0)
• 69.63.176.0 - 69.63.191.255     (69.63.176.0/20 )(69.63.176.0/255.255.240.0)
• 69.171.224.0 - 69.171.255.255
• 204.15.20.0 - 204.15.23.255

Additional IP ranges which may be assigned to Facebook Inc. (Optional)

• 65.201.208.24/29
• 65.204.104.128/28
• 66.92.180.48/28
• 66.93.78.176/29
• 66.199.37.136/29
• 67.200.105.48/30
• 74.119.76.0/22
• 173.252.64.0/18