A, B, C in both the three public addresses, private addresses also: class A address, 10.0.0.0-10.255.255.255 class B private address in the address, 172.16.0.0-172.31.255.255 Yes. private address. In a class C address, 192.168.0.0-192.168.255.255 is a private address.
International regulations: all the IP addresses are divided into A, B, C, D, E five categories.
IP addresses configured: a host network number + number.
Class A IP ranges: the first is 0; 1.0.0.1 ~~ 126.255.255.254; host No. 24.
Class B IP range: for the first two 10; 128.0.0.1 ~~ 191.255.255.254; 16-bit host number.
Class C IP range: the top three to 110; 192.0.0.1 ~~ 223.255.255.254; host No. 8.
Class D IP range: first four bits 1110; 224.0.0.1 ~~ 239.255.255.254.
Class E IP range: the top five to 11110; 240.0.0.1 ~~ 254.255.255.254.