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With classful addressing, then, the ,subnet mask, will have 8, 16, or 24 one ,bits, for Class A, B, and C addresses, respectively. In the parlance ,of subnet, masking, these ,masks, would be said to be 8, 16, or 24 ,bits, in length but that is a misnomer; it really only refers to the ,number, if one ,bits, since ,masks, really are always 32 ,bits, long.
Both the network and subnetwork numbers are used in routing and the host ,number, is the host address. A ,subnet mask, defines the format of an IP address numerically where the network and subnetwork ,bits, that form the address have ,mask bit, values of 1 and the host component of the address uses a ,mask bit, …
In IPv4, the ,subnet mask, 255.255.255.0 is 32 ,bits, and consists of four 8-,bit, octets. The address: 10.10.10.0 ,subnet mask, 255.255.255.0 means that the ,subnet, is a range of IP addresses from 10.10.10.0 - 10.10.10.255. The prefix-length in IPv6 is the equivalent of the ,subnet mask, in IPv4.
Each “1” in the subnet mask exists for the bit portions of the IP address allocated to the network, and each “0” exists for when a bit portion is allocated to the host. Here is an example: 11111111.11111111.11111111.0000000 (subnet mask) 11000000.10101000.01111011.10000100 (IP address 192.168.123.132 in binary)
10/8/2005, · Class B ,Subnet, Effective Effective ,Number of Subnet Bits Mask, Subnets Hosts ,Mask Bits, ----- ----- ----- ----- ----- 1 255.255.128.0 2 32766 /17 2 255.255.192.0 4 16382 /18 3 255.255.224.0 8 8190 /19 4 255.255.240.0 16 4094 /20 5 255.255.248.0 32 2046 /21 6 255.255.252.0 64 1022 /22 7 255.255.254.0 128 510 /23 8 255.255.255.0 256 254 /24 9 255.255.255.128 512 126 /25 10 …
But if we had a ,subnet mask, of 255.255.255.192, that would mean there are only 6 ,bits, available to us (we get 192 because the ,bits, representing 128 and 64 are masked out). Because 63 is the highest decimal value that can be represented with 6 binary ,bits, (1 + 2 + 4 + 8 + 16 + 32), when you add the zero, that makes 64 possible values.
A ,subnet mask, is 32 ,bits, numbers in which the series of 1’s represents the Network ID part and the ,Subnet, ID part whereas the series of 0’s represents the Host ID part. So, in the above example of the Class C IP address, we represent all the network ID ,bits, by 1 .
2- The default subnet mask of this major class is (255.255.255.0) , which means 24 bits is Network portion and 8 bits is for Host portion. n. 3- use the formula ( Number of Networks = 2 ) ,,,,, where N is the number of borrowed network from the host portion bits.
The borrowed ,bits, are the host ,bits, in the default ,subnet mask, that are used for network in the custom ,subnet mask,. In your example: Last byte of the default ,subnet mask,: Binary Decimal 00000000 -> 0 Last byte of the custom ,subnet mask,: Binary Decimal 11110000 -> 240 The first four (4) ,bits, go from host to network, they are borrowed ,bits,.