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What is a Subnet Mask?

 

what is a subnet mask

Understanding a Subnet Mask?

Subnet Mask

an ip provides two ingredients, the community target while the variety address. A subnet mask distinguishes the internet protocol address in to the host and network address (<network><host>). Subnetting further divides the variety part of an IP address into a subnet and variety address (<network><subnet><host>) if extra subnetwork becomes necessary. Use the Subnet Calculator to retrieve subnetwork ideas from ip and Subnet Mask. It is labeled as a subnet mask because it’s used to determine circle target of an IP address by perfoming a operation and bitwise on the netmask.

what is a subnet mask?A Subnet mask are a 32-bit quantity that goggles an IP address, and divides the internet protocol address into network target and number address. Subnet Mask is created by position circle bits to any or all “1”s and setting host pieces to all “0”s. Within a given system, two number contact are arranged for special purpose, and should not feel allotted to offers. The “0” target are designated a system target and “255” is allotted to a broadcast target, and they can not be allotted to offers.

Types of commonly used netmasks for classed companies include 8-bits (Class A), 16-bits (Class B) and 24-bits (lessons C), and networks that are classless as follows:

Lessons Address # 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 IP system is to split up a network that is big small several networking sites for reorganization and protection functions. All nodes (hosts) in a subnetwork discover all boxes sent by any node in a system. Performance of a system is actually negatively suffering under hefty traffic burden as a result of accidents and retransmissions.

Using a subnet mask to an ip distinguishes network target from number target. The community parts tend to be symbolized because of the 1’s in the mask, plus the number pieces is displayed by 0’s. Carrying out a bitwise logical AND operation throughout the ip because of the subnet mask brings the system address. For instance, using the Class C subnet mask to our ip 216.3.128.12 generates the following system target:

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)