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)10.0.0.0/9
network10.0.0.0/9
broadcast10.127.255.255
first host10.0.0.1
last host10.127.255.254
subnet mask255.128.0.0
wildcard0.127.255.255
addresses8,388,608
usable hosts8,388,606
classA
ipcalc 10.0.0.0/9
address00001010.00000000.00000000.00000000
subnet mask11111111.10000000.00000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.01111111.11111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0
/9 split into /16 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.0.0/16 | 10.0.0.1 – 10.0.255.254 | 10.0.255.255 |
| 2 | 10.1.0.0/16 | 10.1.0.1 – 10.1.255.254 | 10.1.255.255 |
| 3 | 10.2.0.0/16 | 10.2.0.1 – 10.2.255.254 | 10.2.255.255 |
| 4 | 10.3.0.0/16 | 10.3.0.1 – 10.3.255.254 | 10.3.255.255 |
| 5 | 10.4.0.0/16 | 10.4.0.1 – 10.4.255.254 | 10.4.255.255 |
| 6 | 10.5.0.0/16 | 10.5.0.1 – 10.5.255.254 | 10.5.255.255 |
| 7 | 10.6.0.0/16 | 10.6.0.1 – 10.6.255.254 | 10.6.255.255 |
| 8 | 10.7.0.0/16 | 10.7.0.1 – 10.7.255.254 | 10.7.255.255 |
| 9 | 10.8.0.0/16 | 10.8.0.1 – 10.8.255.254 | 10.8.255.255 |
| 10 | 10.9.0.0/16 | 10.9.0.1 – 10.9.255.254 | 10.9.255.255 |
| 11 | 10.10.0.0/16 | 10.10.0.1 – 10.10.255.254 | 10.10.255.255 |
| 12 | 10.11.0.0/16 | 10.11.0.1 – 10.11.255.254 | 10.11.255.255 |
| 13 | 10.12.0.0/16 | 10.12.0.1 – 10.12.255.254 | 10.12.255.255 |
| 14 | 10.13.0.0/16 | 10.13.0.1 – 10.13.255.254 | 10.13.255.255 |
| 15 | 10.14.0.0/16 | 10.14.0.1 – 10.14.255.254 | 10.14.255.255 |
| 16 | 10.15.0.0/16 | 10.15.0.1 – 10.15.255.254 | 10.15.255.255 |
| 17 | 10.16.0.0/16 | 10.16.0.1 – 10.16.255.254 | 10.16.255.255 |
| 18 | 10.17.0.0/16 | 10.17.0.1 – 10.17.255.254 | 10.17.255.255 |
| 19 | 10.18.0.0/16 | 10.18.0.1 – 10.18.255.254 | 10.18.255.255 |
| 20 | 10.19.0.0/16 | 10.19.0.1 – 10.19.255.254 | 10.19.255.255 |
| 21 | 10.20.0.0/16 | 10.20.0.1 – 10.20.255.254 | 10.20.255.255 |
| 22 | 10.21.0.0/16 | 10.21.0.1 – 10.21.255.254 | 10.21.255.255 |
| 23 | 10.22.0.0/16 | 10.22.0.1 – 10.22.255.254 | 10.22.255.255 |
| 24 | 10.23.0.0/16 | 10.23.0.1 – 10.23.255.254 | 10.23.255.255 |
| 25 | 10.24.0.0/16 | 10.24.0.1 – 10.24.255.254 | 10.24.255.255 |
| 26 | 10.25.0.0/16 | 10.25.0.1 – 10.25.255.254 | 10.25.255.255 |
| 27 | 10.26.0.0/16 | 10.26.0.1 – 10.26.255.254 | 10.26.255.255 |
| 28 | 10.27.0.0/16 | 10.27.0.1 – 10.27.255.254 | 10.27.255.255 |
| 29 | 10.28.0.0/16 | 10.28.0.1 – 10.28.255.254 | 10.28.255.255 |
| 30 | 10.29.0.0/16 | 10.29.0.1 – 10.29.255.254 | 10.29.255.255 |
| 31 | 10.30.0.0/16 | 10.30.0.1 – 10.30.255.254 | 10.30.255.255 |
| 32 | 10.31.0.0/16 | 10.31.0.1 – 10.31.255.254 | 10.31.255.255 |
| 33 | 10.32.0.0/16 | 10.32.0.1 – 10.32.255.254 | 10.32.255.255 |
| 34 | 10.33.0.0/16 | 10.33.0.1 – 10.33.255.254 | 10.33.255.255 |
| 35 | 10.34.0.0/16 | 10.34.0.1 – 10.34.255.254 | 10.34.255.255 |
| 36 | 10.35.0.0/16 | 10.35.0.1 – 10.35.255.254 | 10.35.255.255 |
| 37 | 10.36.0.0/16 | 10.36.0.1 – 10.36.255.254 | 10.36.255.255 |
| 38 | 10.37.0.0/16 | 10.37.0.1 – 10.37.255.254 | 10.37.255.255 |
| 39 | 10.38.0.0/16 | 10.38.0.1 – 10.38.255.254 | 10.38.255.255 |
| 40 | 10.39.0.0/16 | 10.39.0.1 – 10.39.255.254 | 10.39.255.255 |
| 41 | 10.40.0.0/16 | 10.40.0.1 – 10.40.255.254 | 10.40.255.255 |
| 42 | 10.41.0.0/16 | 10.41.0.1 – 10.41.255.254 | 10.41.255.255 |
| 43 | 10.42.0.0/16 | 10.42.0.1 – 10.42.255.254 | 10.42.255.255 |
| 44 | 10.43.0.0/16 | 10.43.0.1 – 10.43.255.254 | 10.43.255.255 |
| 45 | 10.44.0.0/16 | 10.44.0.1 – 10.44.255.254 | 10.44.255.255 |
| 46 | 10.45.0.0/16 | 10.45.0.1 – 10.45.255.254 | 10.45.255.255 |
| 47 | 10.46.0.0/16 | 10.46.0.1 – 10.46.255.254 | 10.46.255.255 |
| 48 | 10.47.0.0/16 | 10.47.0.1 – 10.47.255.254 | 10.47.255.255 |
| 49 | 10.48.0.0/16 | 10.48.0.1 – 10.48.255.254 | 10.48.255.255 |
| 50 | 10.49.0.0/16 | 10.49.0.1 – 10.49.255.254 | 10.49.255.255 |
| 51 | 10.50.0.0/16 | 10.50.0.1 – 10.50.255.254 | 10.50.255.255 |
| 52 | 10.51.0.0/16 | 10.51.0.1 – 10.51.255.254 | 10.51.255.255 |
| 53 | 10.52.0.0/16 | 10.52.0.1 – 10.52.255.254 | 10.52.255.255 |
| 54 | 10.53.0.0/16 | 10.53.0.1 – 10.53.255.254 | 10.53.255.255 |
| 55 | 10.54.0.0/16 | 10.54.0.1 – 10.54.255.254 | 10.54.255.255 |
| 56 | 10.55.0.0/16 | 10.55.0.1 – 10.55.255.254 | 10.55.255.255 |
| 57 | 10.56.0.0/16 | 10.56.0.1 – 10.56.255.254 | 10.56.255.255 |
| 58 | 10.57.0.0/16 | 10.57.0.1 – 10.57.255.254 | 10.57.255.255 |
| 59 | 10.58.0.0/16 | 10.58.0.1 – 10.58.255.254 | 10.58.255.255 |
| 60 | 10.59.0.0/16 | 10.59.0.1 – 10.59.255.254 | 10.59.255.255 |
| 61 | 10.60.0.0/16 | 10.60.0.1 – 10.60.255.254 | 10.60.255.255 |
| 62 | 10.61.0.0/16 | 10.61.0.1 – 10.61.255.254 | 10.61.255.255 |
| 63 | 10.62.0.0/16 | 10.62.0.1 – 10.62.255.254 | 10.62.255.255 |
| 64 | 10.63.0.0/16 | 10.63.0.1 – 10.63.255.254 | 10.63.255.255 |
| 65 | 10.64.0.0/16 | 10.64.0.1 – 10.64.255.254 | 10.64.255.255 |
| 66 | 10.65.0.0/16 | 10.65.0.1 – 10.65.255.254 | 10.65.255.255 |
| 67 | 10.66.0.0/16 | 10.66.0.1 – 10.66.255.254 | 10.66.255.255 |
| 68 | 10.67.0.0/16 | 10.67.0.1 – 10.67.255.254 | 10.67.255.255 |
| 69 | 10.68.0.0/16 | 10.68.0.1 – 10.68.255.254 | 10.68.255.255 |
| 70 | 10.69.0.0/16 | 10.69.0.1 – 10.69.255.254 | 10.69.255.255 |
| 71 | 10.70.0.0/16 | 10.70.0.1 – 10.70.255.254 | 10.70.255.255 |
| 72 | 10.71.0.0/16 | 10.71.0.1 – 10.71.255.254 | 10.71.255.255 |
| 73 | 10.72.0.0/16 | 10.72.0.1 – 10.72.255.254 | 10.72.255.255 |
| 74 | 10.73.0.0/16 | 10.73.0.1 – 10.73.255.254 | 10.73.255.255 |
| 75 | 10.74.0.0/16 | 10.74.0.1 – 10.74.255.254 | 10.74.255.255 |
| 76 | 10.75.0.0/16 | 10.75.0.1 – 10.75.255.254 | 10.75.255.255 |
| 77 | 10.76.0.0/16 | 10.76.0.1 – 10.76.255.254 | 10.76.255.255 |
| 78 | 10.77.0.0/16 | 10.77.0.1 – 10.77.255.254 | 10.77.255.255 |
| 79 | 10.78.0.0/16 | 10.78.0.1 – 10.78.255.254 | 10.78.255.255 |
| 80 | 10.79.0.0/16 | 10.79.0.1 – 10.79.255.254 | 10.79.255.255 |
| 81 | 10.80.0.0/16 | 10.80.0.1 – 10.80.255.254 | 10.80.255.255 |
| 82 | 10.81.0.0/16 | 10.81.0.1 – 10.81.255.254 | 10.81.255.255 |
| 83 | 10.82.0.0/16 | 10.82.0.1 – 10.82.255.254 | 10.82.255.255 |
| 84 | 10.83.0.0/16 | 10.83.0.1 – 10.83.255.254 | 10.83.255.255 |
| 85 | 10.84.0.0/16 | 10.84.0.1 – 10.84.255.254 | 10.84.255.255 |
| 86 | 10.85.0.0/16 | 10.85.0.1 – 10.85.255.254 | 10.85.255.255 |
| 87 | 10.86.0.0/16 | 10.86.0.1 – 10.86.255.254 | 10.86.255.255 |
| 88 | 10.87.0.0/16 | 10.87.0.1 – 10.87.255.254 | 10.87.255.255 |
| 89 | 10.88.0.0/16 | 10.88.0.1 – 10.88.255.254 | 10.88.255.255 |
| 90 | 10.89.0.0/16 | 10.89.0.1 – 10.89.255.254 | 10.89.255.255 |
| 91 | 10.90.0.0/16 | 10.90.0.1 – 10.90.255.254 | 10.90.255.255 |
| 92 | 10.91.0.0/16 | 10.91.0.1 – 10.91.255.254 | 10.91.255.255 |
| 93 | 10.92.0.0/16 | 10.92.0.1 – 10.92.255.254 | 10.92.255.255 |
| 94 | 10.93.0.0/16 | 10.93.0.1 – 10.93.255.254 | 10.93.255.255 |
| 95 | 10.94.0.0/16 | 10.94.0.1 – 10.94.255.254 | 10.94.255.255 |
| 96 | 10.95.0.0/16 | 10.95.0.1 – 10.95.255.254 | 10.95.255.255 |
| 97 | 10.96.0.0/16 | 10.96.0.1 – 10.96.255.254 | 10.96.255.255 |
| 98 | 10.97.0.0/16 | 10.97.0.1 – 10.97.255.254 | 10.97.255.255 |
| 99 | 10.98.0.0/16 | 10.98.0.1 – 10.98.255.254 | 10.98.255.255 |
| 100 | 10.99.0.0/16 | 10.99.0.1 – 10.99.255.254 | 10.99.255.255 |
| 101 | 10.100.0.0/16 | 10.100.0.1 – 10.100.255.254 | 10.100.255.255 |
| 102 | 10.101.0.0/16 | 10.101.0.1 – 10.101.255.254 | 10.101.255.255 |
| 103 | 10.102.0.0/16 | 10.102.0.1 – 10.102.255.254 | 10.102.255.255 |
| 104 | 10.103.0.0/16 | 10.103.0.1 – 10.103.255.254 | 10.103.255.255 |
| 105 | 10.104.0.0/16 | 10.104.0.1 – 10.104.255.254 | 10.104.255.255 |
| 106 | 10.105.0.0/16 | 10.105.0.1 – 10.105.255.254 | 10.105.255.255 |
| 107 | 10.106.0.0/16 | 10.106.0.1 – 10.106.255.254 | 10.106.255.255 |
| 108 | 10.107.0.0/16 | 10.107.0.1 – 10.107.255.254 | 10.107.255.255 |
| 109 | 10.108.0.0/16 | 10.108.0.1 – 10.108.255.254 | 10.108.255.255 |
| 110 | 10.109.0.0/16 | 10.109.0.1 – 10.109.255.254 | 10.109.255.255 |
| 111 | 10.110.0.0/16 | 10.110.0.1 – 10.110.255.254 | 10.110.255.255 |
| 112 | 10.111.0.0/16 | 10.111.0.1 – 10.111.255.254 | 10.111.255.255 |
| 113 | 10.112.0.0/16 | 10.112.0.1 – 10.112.255.254 | 10.112.255.255 |
| 114 | 10.113.0.0/16 | 10.113.0.1 – 10.113.255.254 | 10.113.255.255 |
| 115 | 10.114.0.0/16 | 10.114.0.1 – 10.114.255.254 | 10.114.255.255 |
| 116 | 10.115.0.0/16 | 10.115.0.1 – 10.115.255.254 | 10.115.255.255 |
| 117 | 10.116.0.0/16 | 10.116.0.1 – 10.116.255.254 | 10.116.255.255 |
| 118 | 10.117.0.0/16 | 10.117.0.1 – 10.117.255.254 | 10.117.255.255 |
| 119 | 10.118.0.0/16 | 10.118.0.1 – 10.118.255.254 | 10.118.255.255 |
| 120 | 10.119.0.0/16 | 10.119.0.1 – 10.119.255.254 | 10.119.255.255 |
| 121 | 10.120.0.0/16 | 10.120.0.1 – 10.120.255.254 | 10.120.255.255 |
| 122 | 10.121.0.0/16 | 10.121.0.1 – 10.121.255.254 | 10.121.255.255 |
| 123 | 10.122.0.0/16 | 10.122.0.1 – 10.122.255.254 | 10.122.255.255 |
| 124 | 10.123.0.0/16 | 10.123.0.1 – 10.123.255.254 | 10.123.255.255 |
| 125 | 10.124.0.0/16 | 10.124.0.1 – 10.124.255.254 | 10.124.255.255 |
| 126 | 10.125.0.0/16 | 10.125.0.1 – 10.125.255.254 | 10.125.255.255 |
| 127 | 10.126.0.0/16 | 10.126.0.1 – 10.126.255.254 | 10.126.255.255 |
| 128 | 10.127.0.0/16 | 10.127.0.1 – 10.127.255.254 | 10.127.255.255 |
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 /9 |
|---|---|---|---|---|
| /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 | 1 |
| /10 | 255.192.0.0 | 4,194,304 | 4,194,302 | 2 split → |
| /11 | 255.224.0.0 | 2,097,152 | 2,097,150 | 4 split → |
| /12 | 255.240.0.0 | 1,048,576 | 1,048,574 | 8 split → |
| /13 | 255.248.0.0 | 524,288 | 524,286 | 16 split → |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 32 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 64 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 128 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 256 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 512 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 1,024 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 2,048 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 4,096 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 8,192 split → |
| /23 | 255.255.254.0 | 512 | 510 | 16,384 split → |
| /24 | 255.255.255.0 | 256 | 254 | 32,768 split → |
| /25 | 255.255.255.128 | 128 | 126 | 65,536 split → |
| /26 | 255.255.255.192 | 64 | 62 | 131,072 split → |
| /27 | 255.255.255.224 | 32 | 30 | 262,144 split → |
| /28 | 255.255.255.240 | 16 | 14 | 524,288 split → |
| /29 | 255.255.255.248 | 8 | 6 | 1,048,576 split → |
| /30 | 255.255.255.252 | 4 | 2 | 2,097,152 split → |
| /31 | 255.255.255.254 | 2 | 2 | 4,194,304 split → |
| /32 | 255.255.255.255 | 1 | 1 | 8,388,608 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.