Scribd
Upload
252 views4 pages

Subnet Guide

This document provides a subnetting sheet that shows the number of hosts and subnet mask for various CIDR subnet sizes ranging from /1 to /32. It notes that the number of hosts doubles with each increment of the CIDR and to always subtract 2 from the host total for the network ID and broadcast addresses. The sheet displays the CIDR, number of hosts, and subnet mask to use for various subnet sizes in the x.0.0.0, 255.x.0.0, 255.255.x.0, and 255.255.255.x subnets.

Uploaded by

tahazzad hossain
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
252 views4 pages

Subnet Guide

This document provides a subnetting sheet that shows the number of hosts and subnet mask for various CIDR subnet sizes ranging from /1 to /32. It notes that the number of hosts doubles with each increment of the CIDR and to always subtract 2 from the host total for the network ID and broadcast addresses. The sheet displays the CIDR, number of hosts, and subnet mask to use for various subnet sizes in the x.0.0.0, 255.x.0.0, 255.255.x.0, and 255.255.255.x subnets.

Uploaded by

tahazzad hossain
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
You are on page 1/ 4

The Cyber Mentor's Subnetting Sheet

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
Subnetting Sheet
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
Subnet 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
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
255 255 255
64 32 16 8 4 2 1
0 0 0 0 0 0 0 /24
0

Hosts 2^8
Hosts 256

You might also like