Importance-what is a subnet mask?

subnet mask

Understanding a Subnet Mask?

what is a subnet mask

Subnet Mask

an IP address has actually two hardware, the community address plus the number target. A subnet mask sets apart the IP address to the community and variety addresses (<network><host>). Subnetting additional divides the variety section of an IP address into a subnet and host address (<network><subnet><host>) if extra subnetwork required. Make use of the Subnet Calculator to recover subnetwork ideas from ip and Subnet Mask. It’s called a subnet mask because it’s made use of to understand circle target of an IP address by perfoming a bitwise AND procedure on the netmask.

A mask that is subnet a 32-bit number that goggles an ip, and divides the IP address into community address and number address. What is a subnet mask?Subnet Mask is made by placing network bits to all or any “1”s and style host bits to all the “0”s. Within a given circle, two variety contact include reserved for special purpose, and should not feel allotted to offers. The “0” target was allocated a system target and “255” is actually assigned to a broadcast address, and additionally they is not allotted to offers.

Examples of commonly used netmasks for classed companies are 8-bits (Class A), 16-bits (Class B) and 24-bits (lessons C), and classless channels is as employs:

Class Target # of Hosts Netmask (Binary) Netmask (Decimal)

CIDR /4 240,435,456 11110000 00000000 00000000 00000000 240.0.0.0

CIDR /5 134,217,728 11111000 00000000 00000000 00000000 248.0.0.0

CIDR /6 67,108,864 11111100 00000000 00000000 00000000 252.0.0.0

CIDR /7 33,554,432 11111110 00000000 00000000 00000000 254.0.0.0

A /8 16,777,216 11111111 00000000 00000000 00000000 255.0.0.0

CIDR /9 8,388,608 11111111 10000000 00000000 00000000 255.128.0.0

CIDR /10 4,194,304 11111111 11000000 00000000 00000000 255.192.0.0

CIDR /11 2,097,152 11111111 11100000 00000000 00000000 255.224.0.0

CIDR /12 1,048,576 11111111 11110000 00000000 00000000 255.240.0.0

CIDR /13 524,288 11111111 11111000 00000000 00000000 255.248.0.0

CIDR /14 262,144 11111111 11111100 00000000 00000000 255.252.0.0

CIDR /15 131,072 11111111 11111110 00000000 00000000 255.254.0.0

B /16 65,534 11111111 11111111 00000000 00000000 255.255.0.0

CIDR /17 32,768 11111111 11111111 10000000 00000000 255.255.128.0

CIDR /18 16,384 11111111 11111111 11000000 00000000 255.255.192.0

CIDR /19 8,192 11111111 11111111 11100000 00000000 255.255.224.0

CIDR /20 4,096 11111111 11111111 11110000 00000000 255.255.240.0

CIDR /21 2,048 11111111 11111111 11111000 00000000 255.255.248.0

CIDR /22 1,024 11111111 11111111 11111100 00000000 255.255.252.0

CIDR /23 512 11111111 11111111 11111110 00000000 255.255.254.0

C /24 256 11111111 11111111 11111111 00000000 255.255.255.0

CIDR /25 128 11111111 11111111 11111111 10000000 255.255.255.128

CIDR /26 64 11111111 11111111 11111111 11000000 255.255.255.192

CIDR /27 32 11111111 11111111 11111111 11100000 255.255.255.224

CIDR /28 16 11111111 11111111 11111111 11110000 255.255.255.240

CIDR /29 8 11111111 11111111 11111111 11111000 255.255.255.248

CIDR /30 4 11111111 11111111 11111111 11111100 255.255.255.252

Subnetting an internet protocol address circle is to divide a network that is big small numerous communities for reorganization and protection needs. All nodes (hosts) in a subnetwork discover all boxes transmitted by any node in a network. Show of a network was adversely suffering under heavier website traffic load due to collisions and retransmissions.

Using a subnet mask to an IP address separates circle target from number address. The community pieces tend to be represented because of the 1’s inside the mask, in addition to host bits include displayed by 0’s. Executing a bitwise logical AND procedure on the ip utilizing the network is produced by the subnet mask target. For instance, applying the Class C subnet mask to our IP address 216.3.128.12 creates the network address that is following

internet protocol address:   1101 1000 . 0000 0011 . 1000 0000 . 0000 1100  (216.003.128.012)

Mask: 1111 1111 . 1111 1111 . 1111 1111 . 0000 0000  (255.255.255.000)

1101 1000 . 0000 0011 . 1000 0000 . 0000 0000  (216.003.128.000)