Class A IP address in the address
Network address (8 bits) + host address (24 bits), according to a predetermined network identification class A address must begin with "0." Oxxxxxx .xxxxxxxx.yyyyyyyy.yyyyyyyy
A number of network-based computing:
Then the network address range 0 to 127. However, due to zero and all-one (Note: High or 0) of the address used for special purposes, in fact, may be assigned a network address range: 1-126.
A number of classes host computing:
Behind 24 is the host ID, so the number of host 16777216-2. 24th power of 2 minus the two reserved addresses 2. Therefore, the scope of the Class A IP address should be: 1 .0.0.1 to 126 .255.255.254 .
Red is for the network logo, green for the host ID. Class A subnet mask address is 255.0.0.0 or / 8.
The IP address of a class B address
Network address (16 bits) + host address (16 bits), according to a predetermined network identification class B address must begin with "10." 10xxxxxx.xxxxxxxx .yyyyyyyy.yyyyyyyy
Class B subnet Calculated:
Because it is a binary, so the number of network segments as follows: 14 times the power of network segments 2, equal to 16,384. Two deduction all "0" and all "1" reserved address, the class B network can have 16,382 segments. Interval Number Class B network represented in decimal: between 128.0.YY.YY to 191.255.YY.YY. 127 is a reserved field 128 so from the beginning.
Host computing Class B: 16-bit host address back, after deduction of two reserved addresses, the maximum number of the host 2 to the power of 16 minus 2, 65534. Class B IP addresses so that the host range 10 hex: 128 . 0 .0.1 to 191.255 .255.254
Red for network identification, green for the host ID. Class B subnet mask or address is 255.255.0.0 / 16.
Class C IP addresses in the address
Network address (32) + host address (8 bits), according to a predetermined network identification Class C address must begin with "110." 110xxxxx.xxxxxxxx.xxxxxxxx . YYYYYYYY
Class C network number is calculated:
Because it is made of two, the number of segments as: 21 th power of 2, equal to 2097152, deducting two all "0" and "1" reserved address, Class C network can have segments 2,097,152. Interval Number Class C network represented in decimal: between 192.0.0.YY to 223.255.255.YY.
Class C hosts Calculated: 8 back to the host address, after deduction of two reserved addresses, the maximum number of hosts is the eighth power of 2 minus 2, 254. Therefore, Class C IP addresses the host range 10 hex: 192.0.0 .1 to 223.255.255 .254
Red for network identification, green for the host ID. Class C subnet mask of 255.255.255.0 or address / 16.
Subnet Mask
Subnet mask, also known as network mask , mask address, subnet mask, which is used to indicate it is a bit of an IP address identifies the subnet host resides, and which bits identify the host was a mask. The subnet mask is a 32-bit address, does not exist alone, it must be combined with the IP address. The subnet mask is only one role, is to divide an IP address into a network address and host address in two parts, and shows the IP address on the LAN, or on a remote network.