IPv4 Subnet Calculator
Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.
private IP (RFC 1918)10.64.0.0/12
network10.64.0.0/12
broadcast10.79.255.255
first host10.64.0.1
last host10.79.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.64.0.0/12
address00001010.01000000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.01000000.00000000.00000000
broadcast00001010.01001111.11111111.11111111
green = network part, grey = host part
hex0x0a400000
decimal171966464
reverse dns0.0.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:0
/12 split into /19 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.64.0.0/19 | 10.64.0.1 – 10.64.31.254 | 10.64.31.255 |
| 2 | 10.64.32.0/19 | 10.64.32.1 – 10.64.63.254 | 10.64.63.255 |
| 3 | 10.64.64.0/19 | 10.64.64.1 – 10.64.95.254 | 10.64.95.255 |
| 4 | 10.64.96.0/19 | 10.64.96.1 – 10.64.127.254 | 10.64.127.255 |
| 5 | 10.64.128.0/19 | 10.64.128.1 – 10.64.159.254 | 10.64.159.255 |
| 6 | 10.64.160.0/19 | 10.64.160.1 – 10.64.191.254 | 10.64.191.255 |
| 7 | 10.64.192.0/19 | 10.64.192.1 – 10.64.223.254 | 10.64.223.255 |
| 8 | 10.64.224.0/19 | 10.64.224.1 – 10.64.255.254 | 10.64.255.255 |
| 9 | 10.65.0.0/19 | 10.65.0.1 – 10.65.31.254 | 10.65.31.255 |
| 10 | 10.65.32.0/19 | 10.65.32.1 – 10.65.63.254 | 10.65.63.255 |
| 11 | 10.65.64.0/19 | 10.65.64.1 – 10.65.95.254 | 10.65.95.255 |
| 12 | 10.65.96.0/19 | 10.65.96.1 – 10.65.127.254 | 10.65.127.255 |
| 13 | 10.65.128.0/19 | 10.65.128.1 – 10.65.159.254 | 10.65.159.255 |
| 14 | 10.65.160.0/19 | 10.65.160.1 – 10.65.191.254 | 10.65.191.255 |
| 15 | 10.65.192.0/19 | 10.65.192.1 – 10.65.223.254 | 10.65.223.255 |
| 16 | 10.65.224.0/19 | 10.65.224.1 – 10.65.255.254 | 10.65.255.255 |
| 17 | 10.66.0.0/19 | 10.66.0.1 – 10.66.31.254 | 10.66.31.255 |
| 18 | 10.66.32.0/19 | 10.66.32.1 – 10.66.63.254 | 10.66.63.255 |
| 19 | 10.66.64.0/19 | 10.66.64.1 – 10.66.95.254 | 10.66.95.255 |
| 20 | 10.66.96.0/19 | 10.66.96.1 – 10.66.127.254 | 10.66.127.255 |
| 21 | 10.66.128.0/19 | 10.66.128.1 – 10.66.159.254 | 10.66.159.255 |
| 22 | 10.66.160.0/19 | 10.66.160.1 – 10.66.191.254 | 10.66.191.255 |
| 23 | 10.66.192.0/19 | 10.66.192.1 – 10.66.223.254 | 10.66.223.255 |
| 24 | 10.66.224.0/19 | 10.66.224.1 – 10.66.255.254 | 10.66.255.255 |
| 25 | 10.67.0.0/19 | 10.67.0.1 – 10.67.31.254 | 10.67.31.255 |
| 26 | 10.67.32.0/19 | 10.67.32.1 – 10.67.63.254 | 10.67.63.255 |
| 27 | 10.67.64.0/19 | 10.67.64.1 – 10.67.95.254 | 10.67.95.255 |
| 28 | 10.67.96.0/19 | 10.67.96.1 – 10.67.127.254 | 10.67.127.255 |
| 29 | 10.67.128.0/19 | 10.67.128.1 – 10.67.159.254 | 10.67.159.255 |
| 30 | 10.67.160.0/19 | 10.67.160.1 – 10.67.191.254 | 10.67.191.255 |
| 31 | 10.67.192.0/19 | 10.67.192.1 – 10.67.223.254 | 10.67.223.255 |
| 32 | 10.67.224.0/19 | 10.67.224.1 – 10.67.255.254 | 10.67.255.255 |
| 33 | 10.68.0.0/19 | 10.68.0.1 – 10.68.31.254 | 10.68.31.255 |
| 34 | 10.68.32.0/19 | 10.68.32.1 – 10.68.63.254 | 10.68.63.255 |
| 35 | 10.68.64.0/19 | 10.68.64.1 – 10.68.95.254 | 10.68.95.255 |
| 36 | 10.68.96.0/19 | 10.68.96.1 – 10.68.127.254 | 10.68.127.255 |
| 37 | 10.68.128.0/19 | 10.68.128.1 – 10.68.159.254 | 10.68.159.255 |
| 38 | 10.68.160.0/19 | 10.68.160.1 – 10.68.191.254 | 10.68.191.255 |
| 39 | 10.68.192.0/19 | 10.68.192.1 – 10.68.223.254 | 10.68.223.255 |
| 40 | 10.68.224.0/19 | 10.68.224.1 – 10.68.255.254 | 10.68.255.255 |
| 41 | 10.69.0.0/19 | 10.69.0.1 – 10.69.31.254 | 10.69.31.255 |
| 42 | 10.69.32.0/19 | 10.69.32.1 – 10.69.63.254 | 10.69.63.255 |
| 43 | 10.69.64.0/19 | 10.69.64.1 – 10.69.95.254 | 10.69.95.255 |
| 44 | 10.69.96.0/19 | 10.69.96.1 – 10.69.127.254 | 10.69.127.255 |
| 45 | 10.69.128.0/19 | 10.69.128.1 – 10.69.159.254 | 10.69.159.255 |
| 46 | 10.69.160.0/19 | 10.69.160.1 – 10.69.191.254 | 10.69.191.255 |
| 47 | 10.69.192.0/19 | 10.69.192.1 – 10.69.223.254 | 10.69.223.255 |
| 48 | 10.69.224.0/19 | 10.69.224.1 – 10.69.255.254 | 10.69.255.255 |
| 49 | 10.70.0.0/19 | 10.70.0.1 – 10.70.31.254 | 10.70.31.255 |
| 50 | 10.70.32.0/19 | 10.70.32.1 – 10.70.63.254 | 10.70.63.255 |
| 51 | 10.70.64.0/19 | 10.70.64.1 – 10.70.95.254 | 10.70.95.255 |
| 52 | 10.70.96.0/19 | 10.70.96.1 – 10.70.127.254 | 10.70.127.255 |
| 53 | 10.70.128.0/19 | 10.70.128.1 – 10.70.159.254 | 10.70.159.255 |
| 54 | 10.70.160.0/19 | 10.70.160.1 – 10.70.191.254 | 10.70.191.255 |
| 55 | 10.70.192.0/19 | 10.70.192.1 – 10.70.223.254 | 10.70.223.255 |
| 56 | 10.70.224.0/19 | 10.70.224.1 – 10.70.255.254 | 10.70.255.255 |
| 57 | 10.71.0.0/19 | 10.71.0.1 – 10.71.31.254 | 10.71.31.255 |
| 58 | 10.71.32.0/19 | 10.71.32.1 – 10.71.63.254 | 10.71.63.255 |
| 59 | 10.71.64.0/19 | 10.71.64.1 – 10.71.95.254 | 10.71.95.255 |
| 60 | 10.71.96.0/19 | 10.71.96.1 – 10.71.127.254 | 10.71.127.255 |
| 61 | 10.71.128.0/19 | 10.71.128.1 – 10.71.159.254 | 10.71.159.255 |
| 62 | 10.71.160.0/19 | 10.71.160.1 – 10.71.191.254 | 10.71.191.255 |
| 63 | 10.71.192.0/19 | 10.71.192.1 – 10.71.223.254 | 10.71.223.255 |
| 64 | 10.71.224.0/19 | 10.71.224.1 – 10.71.255.254 | 10.71.255.255 |
| 65 | 10.72.0.0/19 | 10.72.0.1 – 10.72.31.254 | 10.72.31.255 |
| 66 | 10.72.32.0/19 | 10.72.32.1 – 10.72.63.254 | 10.72.63.255 |
| 67 | 10.72.64.0/19 | 10.72.64.1 – 10.72.95.254 | 10.72.95.255 |
| 68 | 10.72.96.0/19 | 10.72.96.1 – 10.72.127.254 | 10.72.127.255 |
| 69 | 10.72.128.0/19 | 10.72.128.1 – 10.72.159.254 | 10.72.159.255 |
| 70 | 10.72.160.0/19 | 10.72.160.1 – 10.72.191.254 | 10.72.191.255 |
| 71 | 10.72.192.0/19 | 10.72.192.1 – 10.72.223.254 | 10.72.223.255 |
| 72 | 10.72.224.0/19 | 10.72.224.1 – 10.72.255.254 | 10.72.255.255 |
| 73 | 10.73.0.0/19 | 10.73.0.1 – 10.73.31.254 | 10.73.31.255 |
| 74 | 10.73.32.0/19 | 10.73.32.1 – 10.73.63.254 | 10.73.63.255 |
| 75 | 10.73.64.0/19 | 10.73.64.1 – 10.73.95.254 | 10.73.95.255 |
| 76 | 10.73.96.0/19 | 10.73.96.1 – 10.73.127.254 | 10.73.127.255 |
| 77 | 10.73.128.0/19 | 10.73.128.1 – 10.73.159.254 | 10.73.159.255 |
| 78 | 10.73.160.0/19 | 10.73.160.1 – 10.73.191.254 | 10.73.191.255 |
| 79 | 10.73.192.0/19 | 10.73.192.1 – 10.73.223.254 | 10.73.223.255 |
| 80 | 10.73.224.0/19 | 10.73.224.1 – 10.73.255.254 | 10.73.255.255 |
| 81 | 10.74.0.0/19 | 10.74.0.1 – 10.74.31.254 | 10.74.31.255 |
| 82 | 10.74.32.0/19 | 10.74.32.1 – 10.74.63.254 | 10.74.63.255 |
| 83 | 10.74.64.0/19 | 10.74.64.1 – 10.74.95.254 | 10.74.95.255 |
| 84 | 10.74.96.0/19 | 10.74.96.1 – 10.74.127.254 | 10.74.127.255 |
| 85 | 10.74.128.0/19 | 10.74.128.1 – 10.74.159.254 | 10.74.159.255 |
| 86 | 10.74.160.0/19 | 10.74.160.1 – 10.74.191.254 | 10.74.191.255 |
| 87 | 10.74.192.0/19 | 10.74.192.1 – 10.74.223.254 | 10.74.223.255 |
| 88 | 10.74.224.0/19 | 10.74.224.1 – 10.74.255.254 | 10.74.255.255 |
| 89 | 10.75.0.0/19 | 10.75.0.1 – 10.75.31.254 | 10.75.31.255 |
| 90 | 10.75.32.0/19 | 10.75.32.1 – 10.75.63.254 | 10.75.63.255 |
| 91 | 10.75.64.0/19 | 10.75.64.1 – 10.75.95.254 | 10.75.95.255 |
| 92 | 10.75.96.0/19 | 10.75.96.1 – 10.75.127.254 | 10.75.127.255 |
| 93 | 10.75.128.0/19 | 10.75.128.1 – 10.75.159.254 | 10.75.159.255 |
| 94 | 10.75.160.0/19 | 10.75.160.1 – 10.75.191.254 | 10.75.191.255 |
| 95 | 10.75.192.0/19 | 10.75.192.1 – 10.75.223.254 | 10.75.223.255 |
| 96 | 10.75.224.0/19 | 10.75.224.1 – 10.75.255.254 | 10.75.255.255 |
| 97 | 10.76.0.0/19 | 10.76.0.1 – 10.76.31.254 | 10.76.31.255 |
| 98 | 10.76.32.0/19 | 10.76.32.1 – 10.76.63.254 | 10.76.63.255 |
| 99 | 10.76.64.0/19 | 10.76.64.1 – 10.76.95.254 | 10.76.95.255 |
| 100 | 10.76.96.0/19 | 10.76.96.1 – 10.76.127.254 | 10.76.127.255 |
| 101 | 10.76.128.0/19 | 10.76.128.1 – 10.76.159.254 | 10.76.159.255 |
| 102 | 10.76.160.0/19 | 10.76.160.1 – 10.76.191.254 | 10.76.191.255 |
| 103 | 10.76.192.0/19 | 10.76.192.1 – 10.76.223.254 | 10.76.223.255 |
| 104 | 10.76.224.0/19 | 10.76.224.1 – 10.76.255.254 | 10.76.255.255 |
| 105 | 10.77.0.0/19 | 10.77.0.1 – 10.77.31.254 | 10.77.31.255 |
| 106 | 10.77.32.0/19 | 10.77.32.1 – 10.77.63.254 | 10.77.63.255 |
| 107 | 10.77.64.0/19 | 10.77.64.1 – 10.77.95.254 | 10.77.95.255 |
| 108 | 10.77.96.0/19 | 10.77.96.1 – 10.77.127.254 | 10.77.127.255 |
| 109 | 10.77.128.0/19 | 10.77.128.1 – 10.77.159.254 | 10.77.159.255 |
| 110 | 10.77.160.0/19 | 10.77.160.1 – 10.77.191.254 | 10.77.191.255 |
| 111 | 10.77.192.0/19 | 10.77.192.1 – 10.77.223.254 | 10.77.223.255 |
| 112 | 10.77.224.0/19 | 10.77.224.1 – 10.77.255.254 | 10.77.255.255 |
| 113 | 10.78.0.0/19 | 10.78.0.1 – 10.78.31.254 | 10.78.31.255 |
| 114 | 10.78.32.0/19 | 10.78.32.1 – 10.78.63.254 | 10.78.63.255 |
| 115 | 10.78.64.0/19 | 10.78.64.1 – 10.78.95.254 | 10.78.95.255 |
| 116 | 10.78.96.0/19 | 10.78.96.1 – 10.78.127.254 | 10.78.127.255 |
| 117 | 10.78.128.0/19 | 10.78.128.1 – 10.78.159.254 | 10.78.159.255 |
| 118 | 10.78.160.0/19 | 10.78.160.1 – 10.78.191.254 | 10.78.191.255 |
| 119 | 10.78.192.0/19 | 10.78.192.1 – 10.78.223.254 | 10.78.223.255 |
| 120 | 10.78.224.0/19 | 10.78.224.1 – 10.78.255.254 | 10.78.255.255 |
| 121 | 10.79.0.0/19 | 10.79.0.1 – 10.79.31.254 | 10.79.31.255 |
| 122 | 10.79.32.0/19 | 10.79.32.1 – 10.79.63.254 | 10.79.63.255 |
| 123 | 10.79.64.0/19 | 10.79.64.1 – 10.79.95.254 | 10.79.95.255 |
| 124 | 10.79.96.0/19 | 10.79.96.1 – 10.79.127.254 | 10.79.127.255 |
| 125 | 10.79.128.0/19 | 10.79.128.1 – 10.79.159.254 | 10.79.159.255 |
| 126 | 10.79.160.0/19 | 10.79.160.1 – 10.79.191.254 | 10.79.191.255 |
| 127 | 10.79.192.0/19 | 10.79.192.1 – 10.79.223.254 | 10.79.223.255 |
| 128 | 10.79.224.0/19 | 10.79.224.1 – 10.79.255.254 | 10.79.255.255 |
01 / table
IPv4 CIDR prefix table.
Click a prefix longer than your network to split it into subnets.
| prefix | subnet mask | addresses | hosts | in your /12 |
|---|---|---|---|---|
| /0 | 0.0.0.0 | 4,294,967,296 | 4,294,967,294 | - |
| /1 | 128.0.0.0 | 2,147,483,648 | 2,147,483,646 | - |
| /2 | 192.0.0.0 | 1,073,741,824 | 1,073,741,822 | - |
| /3 | 224.0.0.0 | 536,870,912 | 536,870,910 | - |
| /4 | 240.0.0.0 | 268,435,456 | 268,435,454 | - |
| /5 | 248.0.0.0 | 134,217,728 | 134,217,726 | - |
| /6 | 252.0.0.0 | 67,108,864 | 67,108,862 | - |
| /7 | 254.0.0.0 | 33,554,432 | 33,554,430 | - |
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | - |
| /9 | 255.128.0.0 | 8,388,608 | 8,388,606 | - |
| /10 | 255.192.0.0 | 4,194,304 | 4,194,302 | - |
| /11 | 255.224.0.0 | 2,097,152 | 2,097,150 | - |
| /12 | 255.240.0.0 | 1,048,576 | 1,048,574 | 1 |
| /13 | 255.248.0.0 | 524,288 | 524,286 | 2 split → |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 4 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 8 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 16 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 32 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 64 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 128 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 256 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 512 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 1,024 split → |
| /23 | 255.255.254.0 | 512 | 510 | 2,048 split → |
| /24 | 255.255.255.0 | 256 | 254 | 4,096 split → |
| /25 | 255.255.255.128 | 128 | 126 | 8,192 split → |
| /26 | 255.255.255.192 | 64 | 62 | 16,384 split → |
| /27 | 255.255.255.224 | 32 | 30 | 32,768 split → |
| /28 | 255.255.255.240 | 16 | 14 | 65,536 split → |
| /29 | 255.255.255.248 | 8 | 6 | 131,072 split → |
| /30 | 255.255.255.252 | 4 | 2 | 262,144 split → |
| /31 | 255.255.255.254 | 2 | 2 | 524,288 split → |
| /32 | 255.255.255.255 | 1 | 1 | 1,048,576 split → |
02 / faq
About this calculator.
How do I use this subnet calculator?
▼
Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.
Why are usable hosts always 2 fewer?
▼
The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.
Can I use it from a terminal?
▼
Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.