https://en.wikipedia.org/wiki/Private_network
10.0.0.0 – 10.255.255.255 (10.0.0.0/8) 172.16.0.0 – 172.31.255.255 (172.16.0.0/12) 192.168.0.0 - 192.168.255.255 (192.168.0.0/16) 127.0.0.0 - 127.255.255.255 (127.0.0.0/8)
Possibly also 100.64.0.0/10 for carriers.
https://tools.ietf.org/html/rfc6598#page-8
https://en.wikipedia.org/wiki/Unique_local_address
Not sure if those can be expressed in uMatrix as a prefix rule.
https://en.wikipedia.org/wiki/Private_network
https://tools.ietf.org/html/rfc1918Possibly also 100.64.0.0/10 for carriers.
https://tools.ietf.org/html/rfc6598#page-8