Learning IPv4 CIDR notation will allow you to simplify network configurations and network information management in IPv4 networks. CIDR (Classless Inter-Domain Routing) notation is a more concise representation of network addresses.
It allows network administrators to take advantage of the benefits of subnetting by specifying the network address along with its routing prefix.
CIDR notation is an essential concept for network administrators since it is a shorthand way of representing network address and subnet mask in one simple line, making it easier to work with network addressing without confusing it with purely numerical values.
IPv4 CIDR Notation Chart
| Number of IP Addresses | Bits | Prefix | Subnet Mask |
|---|---|---|---|
| 1 | 0 | /32 | 255.255.255.255 |
| 2 | 1 | /31 | 255.255.255.254 |
| 4 | 2 | /30 | 255.255.255.252 |
| 8 | 3 | /29 | 255.255.255.248 |
| 16 | 4 | /28 | 255.255.255.240 |
| 32 | 5 | /27 | 255.255.255.224 |
| 64 | 6 | /26 | 255.255.255.192 |
| 128 | 7 | /25 | 255.255.255.128 |
| 256 | 8 | /24 | 255.255.255.0 |
| 512 | 9 | /23 | 255.255.254.0 |
| 1,024 | 10 | /22 | 255.255.252.0 |
| 2,048 | 11 | /21 | 255.255.248.0 |
| 4,096 | 12 | /20 | 255.255.240.0 |
| 8,192 | 13 | /19 | 255.255.224.0 |
| 16,384 | 14 | /18 | 255.255.192.0 |
| 32,768 | 15 | /17 | 255.255.128.0 |
| 65,536 | 16 | /16 | 255.255.0.0 |
| 131,072 | 17 | /15 | 255.254.0.0 |
| 262,144 | 18 | /14 | 255.252.0.0 |
| 524,288 | 19 | /13 | 255.248.0.0 |
| 1,048,576 | 20 | /12 | 255.240.0.0 |
| 2,097,152 | 21 | /11 | 255.224.0.0 |
| 4,194,304 | 22 | /10 | 255.192.0.0 |
| 8,388,608 | 23 | /9 | 255.128.0.0 |
| 16,777,216 | 24 | /8 | 255.0.0.0 |
| 33,554,432 | 25 | /7 | 254.0.0.0 |
| 67,108,864 | 26 | /6 | 252.0.0.0 |
| 134,217,728 | 27 | /5 | 248.0.0.0 |
| 268,435,456 | 28 | /4 | 240.0.0.0 |
| 536,870,912 | 29 | /3 | 224.0.0.0 |
| 1,073,741,824 | 30 | /2 | 192.0.0.0 |
| 2,147,483,648 | 31 | /1 | 128.0.0.0 |
| 4,294,967,296 | 32 | /0 | 0.0.0.0 |
IPv4 CIDR Notation Conclusion
In conclusion, using CIDR notation is essential in creating and managing efficient networks. The chart provided previously can be especially useful to help reduce complexity and save your organization from any future network problems when dealing with larger networks.
Learning to use CIDR notation facilitates powerful methods such as subnetting, which gives flexibility to network administrators when shaping and configuring network architectures.
In short, CIDR notation allows network admins greater control over the structure and organization of their network systems efficiently and effectively.
So here’s to your next configuration task using CIDR notation. May it bring efficiency and less stress!
