Exactly what is a subnet mask?

maask 1

What exactly is a Subnet Mask?

Subnet Mask

an ip enjoys two hardware, the circle target and also the variety address. A subnet mask distinguishes the IP address to the system and variety details (<network><host>). Subnetting divides that are further number element of an IP address into a subnet and variety address (<network><subnet><host>) if extra subnetwork is necessary. Make use of the Subnet Calculator to access subnetwork information from internet protocol address and Subnet Mask. Its called a subnet mask because it’s put to identify circle address of an IP target by perfoming a bitwise AND process on the netmask.

A Subnet mask was a 32-bit amounts that goggles an internet protocol address, and splits the internet protocol address into network address and host target. What is a subnet mask?Subnet Mask is made by place system bits to all or any “1”s and style host bits to all or any “0”s. Within a given system, two host address contact information include set aside for special purpose, and cannot feel assigned to hosts. The “0” address are designated a network address and “255” is assigned to a broadcast target, and so they can’t be allotted to offers.

what is a subnet mask

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

Class 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 community is always to split a network that is big modest numerous companies for reorganization and security needs. All nodes (offers) in a subnetwork read all packets sent by any node in a system. Results of a network are negatively affected under heavier traffic weight due to collisions and retransmissions.

Implementing a subnet mask to an internet protocol address sets apart network address from number target. The circle pieces become displayed of the 1’s for the mask, while the variety bits are displayed by 0’s. Carrying out a bitwise sensible AND process regarding the internet protocol address making use of subnet mask brings the community target. For example, using the Class C subnet mask to our IP address 216.3.128.12 brings the following community target:

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)