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
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