Everybody knows about 192.168.* but it is not the only one. Actually, there is an RFC: #1918 that controls this, and the winning “combinations” are:

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix) \