abc class private-network private-lan

TCP Class	Ip Network	Private LAN	Must mask	subnet
A	1-126 [00000001] [01111111]	10.0.0.0 /8	255.0.0.0	255.128.0.0
B	128-191 [10000001] [10111111]	172.16.0.0 /16 to 172.31.0.0 /16	255.255.0.0	255.255.192.0
C	192-223 [11000000] [11011111]	192.168.0.0 /24 to 192.168.255.0 /24	255.255.255.0	255.255.255.224
D	224-239	Multi case
E	240-255	Remain
Class D is multicase purpose. Some software can add a ip number on the lan Card for rec'd purpose. A lan can have more than 1 this number. 1 < many. Subnet Mask option : 0,128,192,224,240,248,252,254,255, A subnet mask is used to idenify the network ID or the Host ID of an IP address.