What is a Netmask?: Difference between revisions

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{| class="wikitable"
{| class="wikitable"
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! style="width: 200px; background: black; color: white;" | IP
! style="width: 200px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | IP
! style="width: 200px; background: black; color: white;" | Netmask
! style="width: 200px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | NETMASK
! style="width: 200px; background: black; color: white;" | Description
! style="width: 400px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | DESCRIPTION
|-
|-
! style="text-align: left; vertical-align: top;" | 192.168.55.161
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.161
| style="text-align: left; vertical-align: top;" | 255.255.255.255
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 255.255.255.255
| style="text-align: left; vertical-align: top;" | Only applies to 192.168.55.161'''
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Only applies to 192.168.55.161'''
|-
|-
! style="text-align: left; vertical-align: top;" | 192.168.55.0
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.0
| style="text-align: left; vertical-align: top;" | 255.255.255.0
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 255.255.255.0
| style="text-align: left; vertical-align: top;" | Applies to IPs in the 192.168.55.0 - 192.168.55.255 range
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Applies to IPs in the 192.168.55.0 - 192.168.55.255 range
|-
|-
! style="text-align: left; vertical-align: top;" | 192.168.55.240
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.240
| style="text-align: left; vertical-align: top;" | 255.255.255.240
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 255.255.255.240
| style="text-align: left; vertical-align: top;" | 192.168.55.240 - 192.168.55.255
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.240 - 192.168.55.255
|-
|-
! style="text-align: left; vertical-align: top;" | 192.168.55.161
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.161
| style="text-align: left; vertical-align: top;" | 255.255.255.0
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 255.255.255.0
| style="text-align: left; vertical-align: top;" | 192.168.55.0 - 192.168.55.255
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.55.0 - 192.168.55.255
|-
|-
! style="text-align: left; vertical-align: top;" | 192.168.0.0
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.0.0
| style="text-align: left; vertical-align: top;" | 255.255.0.0
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 255.255.0.0
| style="text-align: left; vertical-align: top;" | 192.168.0.0 - 192.168.255.255
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 192.168.0.0 - 192.168.255.255
|-
|-
|}
|}
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{| class="wikitable"
{| class="wikitable"
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! style="text-align: left; width: 200px; background: black; color: white;" | Netmask
! style="width: 200px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | NETMASK
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255
|-
|-
! style="text-align: left; vertical-align: top;"   | Netmask length
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Netmask length
| style="text-align: center; vertical-align: top;" | 8
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 8
| style="text-align: center; vertical-align: top;" | 16
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 16
| style="text-align: center; vertical-align: top;" | 24
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 24
| style="text-align: center; vertical-align: top;" | 32
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 32
|-
|-
|}
|}
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{| class="wikitable"
{| class="wikitable"
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! style="text-align: left; width: 200px; background: black; color: white;" | Netmask
! style="width: 200px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | NETMASK
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 0
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 0
|-
|-
! style="text-align: left; vertical-align: top;"   | Netmask length
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Netmask length
| style="text-align: center; vertical-align: top;" | 8
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 8
| style="text-align: center; vertical-align: top;" | 16
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 16
| style="text-align: center; vertical-align: top;" | 24
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 24
| style="text-align: center; vertical-align: top;" | -
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | -
|-
|-
|}
|}
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{| class="wikitable"
{| class="wikitable"
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! style="text-align: left; width: 200px; background: black; color: white;" | Netmask
! style="width: 200px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | NETMASK
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 255.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 255.
! style="width: 100px; background: black; color: white;" | 0.
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 0.
! style="width: 100px; background: black; color: white;" | 0
! style="width: 100px; border: 1px solid white; border-bottom: 2px solid #0054A6; background: white; color: #0054A6; text-align: left;" | 0
|-
|-
! style="text-align: left; vertical-align: top;"   | Netmask length
! style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | Netmask length
| style="text-align: center; vertical-align: top;" | 8
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 8
| style="text-align: center; vertical-align: top;" | 16
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | 16
| style="text-align: center; vertical-align: top;" | -
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | -
| style="text-align: center; vertical-align: top;" | -
| style="border: 1px solid white; border-bottom: 2px solid #E8E8E8; text-align: left; vertical-align: top; background: white;" | -
|-
|-
|}
|}


And so on.
And so on.

Revision as of 13:52, 2 November 2018

Main Page > FAQ > Networking > What is a Netmask?

A Netmask is a 32-bit "mask" used to divide an IP address into subnets and specify the network's available hosts. In a netmask, two bits are always automatically assigned. For example, in 255.255.225.0, "0" is the assigned network address. In 255.255.255.255, "255" is the assigned broadcast address. The 0 and 255 are always assigned and cannot be used.

Netmask defines how "large" a network is or if you're configuring a rule that requires an IP address and a Netmask, the Netmask will signify to what portion or range of the Network the rule will apply to:

IP NETMASK DESCRIPTION
192.168.55.161 255.255.255.255 Only applies to 192.168.55.161
192.168.55.0 255.255.255.0 Applies to IPs in the 192.168.55.0 - 192.168.55.255 range
192.168.55.240 255.255.255.240 192.168.55.240 - 192.168.55.255
192.168.55.161 255.255.255.0 192.168.55.0 - 192.168.55.255
192.168.0.0 255.255.0.0 192.168.0.0 - 192.168.255.255


Sometimes you will see that a Netmask is defined by one number, e.g., 24. This number is the length of the Netmask in bits:

NETMASK 255. 255. 255. 255
Netmask length 8 16 24 32


So, for example, a Netmask that is 24-bits long is 255.255.255.0:

NETMASK 255. 255. 255. 0
Netmask length 8 16 24 -


A Netmask that is 16-bits long is 255.255.0.0:

NETMASK 255. 255. 0. 0
Netmask length 8 16 - -

And so on.

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