# Subnet Calculator

## Calculate How Many Subnets you need

### CIDR Conversion Table

/24 254 11111111 11111111 11111111 00000000255.255.255.0
/25 128 11111111 11111111 11111111 10000000255.255.255.128
/26 64 11111111 11111111 11111111 11000000255.255.255.192
/27 32 11111111 11111111 11111111 11100000255.255.255.224
/28 16 11111111 11111111 11111111 11110000255.255.255.240
/29 8 11111111 11111111 11111111 11111000255.255.255.248
/30 4 11111111 11111111 11111111 11111100255.255.255.252

### Subnet

Can be created using any of the IP classes A, B and C but these can have limitation due to the fixed network ID length such as 8, 16 and 24. Subnet gives the ability to have the network ID of any length of our choosing. Subnet mask is used to determine how long the network ID length is and how many bits is allocated to the network ID and host ID and tells the router which part of the address network ID and host ID.

### CIDR

CIDR stands for (Classes Inter-Domain Routing) is used to represent an IP address range and the network mask for example “xxx.xxx.xxx.xxx/n” where the x’s represent the IP address of the CIDR and “n” being the network prefix.

### Subnet Table

 CIDR Subnet Mask Total Addresses Usable Addresses /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 16,384 16,382 /17 255.255.128.0 32,768 32,766 /16 255.255.0.0 65,536 65,534 /15 255.254.0.0 131,072 131,070 /14 255.252.0.0 262,144 262,142 /13 255.248.0.0 524,288 524,286 /12 255.240.0.0 1,048,576 1,048,574 /11 255.224.0.0 2,097,152 2,097,150 /10 255.192.0.0 4,194,304 4,194,302 /9 255.128.0.0 8,388,608 8,388,606 /8 255.0.0.0 16,777,216 16,777,214 /7 254.0.0.0 33,554,432 33,554,430 /6 252.0.0.0 67,108,864 67,108,862 /5 248.0.0.0 134,217,728 134,217,726 /4 240.0.0.0 268,435,456 268,435,454 /3 224.0.0.0 536,870,912 536,870,910 /2 192.0.0.0 1,073,741,824 1,073,741,822 /1 128.0.0.0 2,147,483,648 2,147,483,646 /0 0.0.0.0 4,294,967,296 4,294,967,294

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