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Subnet Guide

The document provides a detailed breakdown of subnetting, including CIDR notations, the number of hosts available for various subnets, and subnet masks. It outlines the host capacity for different CIDR values across multiple subnet ranges, including examples with specific IP addresses. Additionally, it includes information on usable host ID ranges and broadcast IDs for a given subnet.

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47 views7 pages

Subnet Guide

The document provides a detailed breakdown of subnetting, including CIDR notations, the number of hosts available for various subnets, and subnet masks. It outlines the host capacity for different CIDR values across multiple subnet ranges, including examples with specific IP addresses. Additionally, it includes information on usable host ID ranges and broadcast IDs for a given subnet.

Uploaded by

bas6677
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Subnet x.0.0.

0
CIDR /1 /2 /3 /4
Hosts 2,147,483,648 1,073,741,824 536,870,912 268,435,456

Subnet 255.x.0.0
CIDR /9 /10 /11 /12
Hosts 8,388,608 4,194,304 2,097,152 1,048,576

Subnet 255.255.x.0
CIDR /17 /18 /19 /20
Hosts 32,768 16,384 8,192 4,096

Subnet 255.255.255.x
CIDR /25 /26 /27 /28
Hosts 128 64 32 16

Subnet Mask (Replace x) 128 192 224 240

Notes: *Hosts double each increment of a CIDR


*Always subtract 2 from host total:
Network ID - First Address
Broadcast - Last Address
Subnet x.0.0.0
/5 /6 /7 /8
134,217,728 67,108,864 33,554,432 16,777,216

Subnet 255.x.0.0
/13 /14 /15 /16
524,288 262,144 131,072 65,536

Subnet 255.255.x.0
/21 /22 /23 /24
2,048 1,024 512 256

ubnet 255.255.255.x
/29 /30 /31 /32
8 4 2 1

248 252 254 255


128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0
255 255 255
32 16 8 4 2 1
0 0 0 0 0 0 /24
0

Hosts 2^8
Hosts 256
Question : 192.168.4.0/24 3 networks

Subnet 1 2 4
Hosts 256 128 64
Subnet Mask /24 /25 /26
8 16 32 64 128 256
32 16 8 4 2 1
/27 /28 /29 /30 /31 /32

Network ID Subnet Mask


192.168.4.0 /26
192.168.4.64 /26
192.168.4.128 /26
192.168.4.192 /26
255.255.255.192
Host ID Ranges Number of Usable Host Broadcase ID
192.168.4.1 - 192.168.4.62 62 192.168.4.63
192.168.4.65 - 192.168.4.126 62 192.168.4.127
192.168.4.129 - 192.168.4.190 62 192.168.4.191
192.168.4.193 - 192.168.4.254 62 192.168.4.255

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