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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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