CIDR, Subnet Masks, and Usable IP Addresses : Quick Reference Guide

CIDR, Subnet Masks, and Usable IP Addresses : Quick Reference Guide

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CIDR, Subnet Masks, and Usable IP Addresses : Quick Reference Guide




CIDR (Classless Inter-Domain Routing), also known as supernetting, is an IP addressing scheme that improves the IP addresses allocation in a better way. This feature also helped substantially extend the existence of IPv4 as well as and it also minimize the booming of routing tables.

 

 

 

In this tutorial, we will give an quick reference about cidr, subnet masks and usable ip address.

 

 

 

A subnet mask is a number that defines a range of IP addresses that can be used in a network, please find the table which shows the CIDR, Subnet Mask, and Usable IPs.

 

 

 

Take a look at the table below,





 CIDR SUBNET MASK TOTAL IPs USABLE IPs
 /32 255.255.255.255 1 1
 /31 255.255.255.254 2 0
 /30 255.255.255.252 4 2
 /29 255.255.255.248 8 6
 /28 255.255.255.240 16 14
 /27 255.255.255.224 32 30
 /26 255.255.255.192 64 62
 /25 255.255.255.128 128 126
 /24 255.255.255.0 256 254
 /23 255.255.254.0 512 510
 /22 255.255.252.0 1024 1022
 /21 255.255.248.0 2048 2046
 /20 255.255.240.0 4096 4094
 /19 255.255.224.0 8192 8190
 /18 255.255.192.0 16384 16382
 /17 255.255.128.0 32768 32766
 /16 255.255.0.0 65536 65534
 /15 255.254.0.0 131072 131070
 /14 255.252.0.0 262144 262142
 /13 255.248.0.0 524288 524286
 /12 255.240.0.0 1048576 1048574
 /11 255.224.0.0 2097152 2097150
 /10 255.192.0.0 4194304 4194302
 /9 255.128.0.0 8388608 8388606
 /8 255.0.0.0 16777216 16777214
 /7 254.0.0.0 33554432 33554430
 /6 252.0.0.0 67108864 67108862
 /5 248.0.0.0 134217728 134217726
 /4 240.0.0.0 268435456 268435454
 /3 224.0.0.0 536870912 536870910
 /2 192.0.0.0 1073741824 1073741822
 /1 128.0.0.0 2147483648 2147483646
 /0 0.0.0.0 4294967296 4294967294

 

 

 

 

 

That’s it!

 

 

 

 

 

Our goal in writing this article is to give you anquick reference about cidr, subnet masks and usable ip address and we hope this article has given you a better understanding.

 

 

 

 

 

 

 

 

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