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)10.56.0.0/15
network10.56.0.0/15
broadcast10.57.255.255
first host10.56.0.1
last host10.57.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.56.0.0/15
address00001010.00111000.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00111000.00000000.00000000
broadcast00001010.00111001.11111111.11111111
green = network part, grey = host part
hex0x0a380000
decimal171442176
reverse dns0.0.56.10.in-addr.arpa
ipv4-mapped::ffff:a38:0
/15 split into /22 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.56.0.0/22 | 10.56.0.1 – 10.56.3.254 | 10.56.3.255 |
| 2 | 10.56.4.0/22 | 10.56.4.1 – 10.56.7.254 | 10.56.7.255 |
| 3 | 10.56.8.0/22 | 10.56.8.1 – 10.56.11.254 | 10.56.11.255 |
| 4 | 10.56.12.0/22 | 10.56.12.1 – 10.56.15.254 | 10.56.15.255 |
| 5 | 10.56.16.0/22 | 10.56.16.1 – 10.56.19.254 | 10.56.19.255 |
| 6 | 10.56.20.0/22 | 10.56.20.1 – 10.56.23.254 | 10.56.23.255 |
| 7 | 10.56.24.0/22 | 10.56.24.1 – 10.56.27.254 | 10.56.27.255 |
| 8 | 10.56.28.0/22 | 10.56.28.1 – 10.56.31.254 | 10.56.31.255 |
| 9 | 10.56.32.0/22 | 10.56.32.1 – 10.56.35.254 | 10.56.35.255 |
| 10 | 10.56.36.0/22 | 10.56.36.1 – 10.56.39.254 | 10.56.39.255 |
| 11 | 10.56.40.0/22 | 10.56.40.1 – 10.56.43.254 | 10.56.43.255 |
| 12 | 10.56.44.0/22 | 10.56.44.1 – 10.56.47.254 | 10.56.47.255 |
| 13 | 10.56.48.0/22 | 10.56.48.1 – 10.56.51.254 | 10.56.51.255 |
| 14 | 10.56.52.0/22 | 10.56.52.1 – 10.56.55.254 | 10.56.55.255 |
| 15 | 10.56.56.0/22 | 10.56.56.1 – 10.56.59.254 | 10.56.59.255 |
| 16 | 10.56.60.0/22 | 10.56.60.1 – 10.56.63.254 | 10.56.63.255 |
| 17 | 10.56.64.0/22 | 10.56.64.1 – 10.56.67.254 | 10.56.67.255 |
| 18 | 10.56.68.0/22 | 10.56.68.1 – 10.56.71.254 | 10.56.71.255 |
| 19 | 10.56.72.0/22 | 10.56.72.1 – 10.56.75.254 | 10.56.75.255 |
| 20 | 10.56.76.0/22 | 10.56.76.1 – 10.56.79.254 | 10.56.79.255 |
| 21 | 10.56.80.0/22 | 10.56.80.1 – 10.56.83.254 | 10.56.83.255 |
| 22 | 10.56.84.0/22 | 10.56.84.1 – 10.56.87.254 | 10.56.87.255 |
| 23 | 10.56.88.0/22 | 10.56.88.1 – 10.56.91.254 | 10.56.91.255 |
| 24 | 10.56.92.0/22 | 10.56.92.1 – 10.56.95.254 | 10.56.95.255 |
| 25 | 10.56.96.0/22 | 10.56.96.1 – 10.56.99.254 | 10.56.99.255 |
| 26 | 10.56.100.0/22 | 10.56.100.1 – 10.56.103.254 | 10.56.103.255 |
| 27 | 10.56.104.0/22 | 10.56.104.1 – 10.56.107.254 | 10.56.107.255 |
| 28 | 10.56.108.0/22 | 10.56.108.1 – 10.56.111.254 | 10.56.111.255 |
| 29 | 10.56.112.0/22 | 10.56.112.1 – 10.56.115.254 | 10.56.115.255 |
| 30 | 10.56.116.0/22 | 10.56.116.1 – 10.56.119.254 | 10.56.119.255 |
| 31 | 10.56.120.0/22 | 10.56.120.1 – 10.56.123.254 | 10.56.123.255 |
| 32 | 10.56.124.0/22 | 10.56.124.1 – 10.56.127.254 | 10.56.127.255 |
| 33 | 10.56.128.0/22 | 10.56.128.1 – 10.56.131.254 | 10.56.131.255 |
| 34 | 10.56.132.0/22 | 10.56.132.1 – 10.56.135.254 | 10.56.135.255 |
| 35 | 10.56.136.0/22 | 10.56.136.1 – 10.56.139.254 | 10.56.139.255 |
| 36 | 10.56.140.0/22 | 10.56.140.1 – 10.56.143.254 | 10.56.143.255 |
| 37 | 10.56.144.0/22 | 10.56.144.1 – 10.56.147.254 | 10.56.147.255 |
| 38 | 10.56.148.0/22 | 10.56.148.1 – 10.56.151.254 | 10.56.151.255 |
| 39 | 10.56.152.0/22 | 10.56.152.1 – 10.56.155.254 | 10.56.155.255 |
| 40 | 10.56.156.0/22 | 10.56.156.1 – 10.56.159.254 | 10.56.159.255 |
| 41 | 10.56.160.0/22 | 10.56.160.1 – 10.56.163.254 | 10.56.163.255 |
| 42 | 10.56.164.0/22 | 10.56.164.1 – 10.56.167.254 | 10.56.167.255 |
| 43 | 10.56.168.0/22 | 10.56.168.1 – 10.56.171.254 | 10.56.171.255 |
| 44 | 10.56.172.0/22 | 10.56.172.1 – 10.56.175.254 | 10.56.175.255 |
| 45 | 10.56.176.0/22 | 10.56.176.1 – 10.56.179.254 | 10.56.179.255 |
| 46 | 10.56.180.0/22 | 10.56.180.1 – 10.56.183.254 | 10.56.183.255 |
| 47 | 10.56.184.0/22 | 10.56.184.1 – 10.56.187.254 | 10.56.187.255 |
| 48 | 10.56.188.0/22 | 10.56.188.1 – 10.56.191.254 | 10.56.191.255 |
| 49 | 10.56.192.0/22 | 10.56.192.1 – 10.56.195.254 | 10.56.195.255 |
| 50 | 10.56.196.0/22 | 10.56.196.1 – 10.56.199.254 | 10.56.199.255 |
| 51 | 10.56.200.0/22 | 10.56.200.1 – 10.56.203.254 | 10.56.203.255 |
| 52 | 10.56.204.0/22 | 10.56.204.1 – 10.56.207.254 | 10.56.207.255 |
| 53 | 10.56.208.0/22 | 10.56.208.1 – 10.56.211.254 | 10.56.211.255 |
| 54 | 10.56.212.0/22 | 10.56.212.1 – 10.56.215.254 | 10.56.215.255 |
| 55 | 10.56.216.0/22 | 10.56.216.1 – 10.56.219.254 | 10.56.219.255 |
| 56 | 10.56.220.0/22 | 10.56.220.1 – 10.56.223.254 | 10.56.223.255 |
| 57 | 10.56.224.0/22 | 10.56.224.1 – 10.56.227.254 | 10.56.227.255 |
| 58 | 10.56.228.0/22 | 10.56.228.1 – 10.56.231.254 | 10.56.231.255 |
| 59 | 10.56.232.0/22 | 10.56.232.1 – 10.56.235.254 | 10.56.235.255 |
| 60 | 10.56.236.0/22 | 10.56.236.1 – 10.56.239.254 | 10.56.239.255 |
| 61 | 10.56.240.0/22 | 10.56.240.1 – 10.56.243.254 | 10.56.243.255 |
| 62 | 10.56.244.0/22 | 10.56.244.1 – 10.56.247.254 | 10.56.247.255 |
| 63 | 10.56.248.0/22 | 10.56.248.1 – 10.56.251.254 | 10.56.251.255 |
| 64 | 10.56.252.0/22 | 10.56.252.1 – 10.56.255.254 | 10.56.255.255 |
| 65 | 10.57.0.0/22 | 10.57.0.1 – 10.57.3.254 | 10.57.3.255 |
| 66 | 10.57.4.0/22 | 10.57.4.1 – 10.57.7.254 | 10.57.7.255 |
| 67 | 10.57.8.0/22 | 10.57.8.1 – 10.57.11.254 | 10.57.11.255 |
| 68 | 10.57.12.0/22 | 10.57.12.1 – 10.57.15.254 | 10.57.15.255 |
| 69 | 10.57.16.0/22 | 10.57.16.1 – 10.57.19.254 | 10.57.19.255 |
| 70 | 10.57.20.0/22 | 10.57.20.1 – 10.57.23.254 | 10.57.23.255 |
| 71 | 10.57.24.0/22 | 10.57.24.1 – 10.57.27.254 | 10.57.27.255 |
| 72 | 10.57.28.0/22 | 10.57.28.1 – 10.57.31.254 | 10.57.31.255 |
| 73 | 10.57.32.0/22 | 10.57.32.1 – 10.57.35.254 | 10.57.35.255 |
| 74 | 10.57.36.0/22 | 10.57.36.1 – 10.57.39.254 | 10.57.39.255 |
| 75 | 10.57.40.0/22 | 10.57.40.1 – 10.57.43.254 | 10.57.43.255 |
| 76 | 10.57.44.0/22 | 10.57.44.1 – 10.57.47.254 | 10.57.47.255 |
| 77 | 10.57.48.0/22 | 10.57.48.1 – 10.57.51.254 | 10.57.51.255 |
| 78 | 10.57.52.0/22 | 10.57.52.1 – 10.57.55.254 | 10.57.55.255 |
| 79 | 10.57.56.0/22 | 10.57.56.1 – 10.57.59.254 | 10.57.59.255 |
| 80 | 10.57.60.0/22 | 10.57.60.1 – 10.57.63.254 | 10.57.63.255 |
| 81 | 10.57.64.0/22 | 10.57.64.1 – 10.57.67.254 | 10.57.67.255 |
| 82 | 10.57.68.0/22 | 10.57.68.1 – 10.57.71.254 | 10.57.71.255 |
| 83 | 10.57.72.0/22 | 10.57.72.1 – 10.57.75.254 | 10.57.75.255 |
| 84 | 10.57.76.0/22 | 10.57.76.1 – 10.57.79.254 | 10.57.79.255 |
| 85 | 10.57.80.0/22 | 10.57.80.1 – 10.57.83.254 | 10.57.83.255 |
| 86 | 10.57.84.0/22 | 10.57.84.1 – 10.57.87.254 | 10.57.87.255 |
| 87 | 10.57.88.0/22 | 10.57.88.1 – 10.57.91.254 | 10.57.91.255 |
| 88 | 10.57.92.0/22 | 10.57.92.1 – 10.57.95.254 | 10.57.95.255 |
| 89 | 10.57.96.0/22 | 10.57.96.1 – 10.57.99.254 | 10.57.99.255 |
| 90 | 10.57.100.0/22 | 10.57.100.1 – 10.57.103.254 | 10.57.103.255 |
| 91 | 10.57.104.0/22 | 10.57.104.1 – 10.57.107.254 | 10.57.107.255 |
| 92 | 10.57.108.0/22 | 10.57.108.1 – 10.57.111.254 | 10.57.111.255 |
| 93 | 10.57.112.0/22 | 10.57.112.1 – 10.57.115.254 | 10.57.115.255 |
| 94 | 10.57.116.0/22 | 10.57.116.1 – 10.57.119.254 | 10.57.119.255 |
| 95 | 10.57.120.0/22 | 10.57.120.1 – 10.57.123.254 | 10.57.123.255 |
| 96 | 10.57.124.0/22 | 10.57.124.1 – 10.57.127.254 | 10.57.127.255 |
| 97 | 10.57.128.0/22 | 10.57.128.1 – 10.57.131.254 | 10.57.131.255 |
| 98 | 10.57.132.0/22 | 10.57.132.1 – 10.57.135.254 | 10.57.135.255 |
| 99 | 10.57.136.0/22 | 10.57.136.1 – 10.57.139.254 | 10.57.139.255 |
| 100 | 10.57.140.0/22 | 10.57.140.1 – 10.57.143.254 | 10.57.143.255 |
| 101 | 10.57.144.0/22 | 10.57.144.1 – 10.57.147.254 | 10.57.147.255 |
| 102 | 10.57.148.0/22 | 10.57.148.1 – 10.57.151.254 | 10.57.151.255 |
| 103 | 10.57.152.0/22 | 10.57.152.1 – 10.57.155.254 | 10.57.155.255 |
| 104 | 10.57.156.0/22 | 10.57.156.1 – 10.57.159.254 | 10.57.159.255 |
| 105 | 10.57.160.0/22 | 10.57.160.1 – 10.57.163.254 | 10.57.163.255 |
| 106 | 10.57.164.0/22 | 10.57.164.1 – 10.57.167.254 | 10.57.167.255 |
| 107 | 10.57.168.0/22 | 10.57.168.1 – 10.57.171.254 | 10.57.171.255 |
| 108 | 10.57.172.0/22 | 10.57.172.1 – 10.57.175.254 | 10.57.175.255 |
| 109 | 10.57.176.0/22 | 10.57.176.1 – 10.57.179.254 | 10.57.179.255 |
| 110 | 10.57.180.0/22 | 10.57.180.1 – 10.57.183.254 | 10.57.183.255 |
| 111 | 10.57.184.0/22 | 10.57.184.1 – 10.57.187.254 | 10.57.187.255 |
| 112 | 10.57.188.0/22 | 10.57.188.1 – 10.57.191.254 | 10.57.191.255 |
| 113 | 10.57.192.0/22 | 10.57.192.1 – 10.57.195.254 | 10.57.195.255 |
| 114 | 10.57.196.0/22 | 10.57.196.1 – 10.57.199.254 | 10.57.199.255 |
| 115 | 10.57.200.0/22 | 10.57.200.1 – 10.57.203.254 | 10.57.203.255 |
| 116 | 10.57.204.0/22 | 10.57.204.1 – 10.57.207.254 | 10.57.207.255 |
| 117 | 10.57.208.0/22 | 10.57.208.1 – 10.57.211.254 | 10.57.211.255 |
| 118 | 10.57.212.0/22 | 10.57.212.1 – 10.57.215.254 | 10.57.215.255 |
| 119 | 10.57.216.0/22 | 10.57.216.1 – 10.57.219.254 | 10.57.219.255 |
| 120 | 10.57.220.0/22 | 10.57.220.1 – 10.57.223.254 | 10.57.223.255 |
| 121 | 10.57.224.0/22 | 10.57.224.1 – 10.57.227.254 | 10.57.227.255 |
| 122 | 10.57.228.0/22 | 10.57.228.1 – 10.57.231.254 | 10.57.231.255 |
| 123 | 10.57.232.0/22 | 10.57.232.1 – 10.57.235.254 | 10.57.235.255 |
| 124 | 10.57.236.0/22 | 10.57.236.1 – 10.57.239.254 | 10.57.239.255 |
| 125 | 10.57.240.0/22 | 10.57.240.1 – 10.57.243.254 | 10.57.243.255 |
| 126 | 10.57.244.0/22 | 10.57.244.1 – 10.57.247.254 | 10.57.247.255 |
| 127 | 10.57.248.0/22 | 10.57.248.1 – 10.57.251.254 | 10.57.251.255 |
| 128 | 10.57.252.0/22 | 10.57.252.1 – 10.57.255.254 | 10.57.255.255 |
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 /15 |
|---|---|---|---|---|
| /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 | - |
| /13 | 255.248.0.0 | 524,288 | 524,286 | - |
| /14 | 255.252.0.0 | 262,144 | 262,142 | - |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 1 |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 2 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 4 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 8 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 16 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 32 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 64 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 128 split → |
| /23 | 255.255.254.0 | 512 | 510 | 256 split → |
| /24 | 255.255.255.0 | 256 | 254 | 512 split → |
| /25 | 255.255.255.128 | 128 | 126 | 1,024 split → |
| /26 | 255.255.255.192 | 64 | 62 | 2,048 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4,096 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8,192 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16,384 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32,768 split → |
| /31 | 255.255.255.254 | 2 | 2 | 65,536 split → |
| /32 | 255.255.255.255 | 1 | 1 | 131,072 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.