Block Facebook Access
If you want to block access to Facebook from your home network, restrict these entire IP ranges:
66. 220. 144. 0 – 66. 220. 159. 25569. 63. 176. 0 – 69. 63. 191. 255204. 15. 20. 0 – 204. 15. 23. 255
Reach Facebook by IP Address
Below are some of the most common active IP addresses for Facebook.com:
69. 63. 176. 1369. 63. 181. 1569. 63. 184. 14269. 63. 187. 1769. 63. 187. 1869. 63. 187. 1969. 63. 181. 1169. 63. 181. 12
In some cases, you can access Facebook by using an IP address instead of its usual URL. This shortcut is handy if you want to visit the social networking service but you cannot resolve domain names behind a given network.
Check out tutorials about enabling your router’s built-in firewall or for using the Windows 10 firewall, if you need a refresher.