What’s a Subnet Mask?

what is a subnet mask

Subnet Mask

an IP address has two components, the network address in addition to number target. A subnet mask distinguishes the ip into the host and network addresses (<network><host>). Subnetting divides that are further variety element of an IP address into a subnet and host address (<network><subnet><host>) if extra subnetwork is needed. Make use of the Subnet Calculator to recover subnetwork ideas from internet protocol address and Subnet Mask. what is a subnet mask?It is known as a subnet mask because it’s put to determine network target of an IP address by perfoming a operation and bitwise on the netmask.

A mask that is subnet a 32-bit amounts that face masks an internet protocol address, and splits the IP address into system address and host target. Subnet Mask is manufactured by place system parts to all the “1”s and setting host bits to all or any “0”s. Within a given circle, two host contact were set aside for special-purpose, and cannot feel allotted to hosts. The “0” target are assigned a system address and “255” is actually allotted to a broadcast target, and additionally they cannot be allotted to offers.

Samples of commonly used netmasks for classed networks are 8-bits (lessons A), 16-bits (lessons B) and 24-bits (Class C), and classless communities become as uses:

Course 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 network is always to separate a big circle into small multiple networks for reorganization and security reasons. All nodes (offers) in a subnetwork read all boxes transmitted by any node in a network. Results of a network try adversely impacted under heavy website traffic weight as a result of crashes and retransmissions.

Implementing a subnet mask to an ip distinguishes circle target from number address. The circle parts include symbolized because of the 1’s in the mask, together with number pieces is represented by 0’s. Carrying out a bitwise logical AND process in the IP address because of the network is produced by the subnet mask target. For example, applying the Class C subnet mask to the ip 216.3.128.12 creates the network address that is following

IP:   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)