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)10.138.0.0/15
network10.138.0.0/15
broadcast10.139.255.255
first host10.138.0.1
last host10.139.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.138.0.0/15
address00001010.10001010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.10001010.00000000.00000000
broadcast00001010.10001011.11111111.11111111
green = network part, grey = host part
hex0x0a8a0000
decimal176816128
reverse dns0.0.138.10.in-addr.arpa
ipv4-mapped::ffff:a8a:0
/15 split into /22 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.138.0.0/22 | 10.138.0.1 – 10.138.3.254 | 10.138.3.255 |
| 2 | 10.138.4.0/22 | 10.138.4.1 – 10.138.7.254 | 10.138.7.255 |
| 3 | 10.138.8.0/22 | 10.138.8.1 – 10.138.11.254 | 10.138.11.255 |
| 4 | 10.138.12.0/22 | 10.138.12.1 – 10.138.15.254 | 10.138.15.255 |
| 5 | 10.138.16.0/22 | 10.138.16.1 – 10.138.19.254 | 10.138.19.255 |
| 6 | 10.138.20.0/22 | 10.138.20.1 – 10.138.23.254 | 10.138.23.255 |
| 7 | 10.138.24.0/22 | 10.138.24.1 – 10.138.27.254 | 10.138.27.255 |
| 8 | 10.138.28.0/22 | 10.138.28.1 – 10.138.31.254 | 10.138.31.255 |
| 9 | 10.138.32.0/22 | 10.138.32.1 – 10.138.35.254 | 10.138.35.255 |
| 10 | 10.138.36.0/22 | 10.138.36.1 – 10.138.39.254 | 10.138.39.255 |
| 11 | 10.138.40.0/22 | 10.138.40.1 – 10.138.43.254 | 10.138.43.255 |
| 12 | 10.138.44.0/22 | 10.138.44.1 – 10.138.47.254 | 10.138.47.255 |
| 13 | 10.138.48.0/22 | 10.138.48.1 – 10.138.51.254 | 10.138.51.255 |
| 14 | 10.138.52.0/22 | 10.138.52.1 – 10.138.55.254 | 10.138.55.255 |
| 15 | 10.138.56.0/22 | 10.138.56.1 – 10.138.59.254 | 10.138.59.255 |
| 16 | 10.138.60.0/22 | 10.138.60.1 – 10.138.63.254 | 10.138.63.255 |
| 17 | 10.138.64.0/22 | 10.138.64.1 – 10.138.67.254 | 10.138.67.255 |
| 18 | 10.138.68.0/22 | 10.138.68.1 – 10.138.71.254 | 10.138.71.255 |
| 19 | 10.138.72.0/22 | 10.138.72.1 – 10.138.75.254 | 10.138.75.255 |
| 20 | 10.138.76.0/22 | 10.138.76.1 – 10.138.79.254 | 10.138.79.255 |
| 21 | 10.138.80.0/22 | 10.138.80.1 – 10.138.83.254 | 10.138.83.255 |
| 22 | 10.138.84.0/22 | 10.138.84.1 – 10.138.87.254 | 10.138.87.255 |
| 23 | 10.138.88.0/22 | 10.138.88.1 – 10.138.91.254 | 10.138.91.255 |
| 24 | 10.138.92.0/22 | 10.138.92.1 – 10.138.95.254 | 10.138.95.255 |
| 25 | 10.138.96.0/22 | 10.138.96.1 – 10.138.99.254 | 10.138.99.255 |
| 26 | 10.138.100.0/22 | 10.138.100.1 – 10.138.103.254 | 10.138.103.255 |
| 27 | 10.138.104.0/22 | 10.138.104.1 – 10.138.107.254 | 10.138.107.255 |
| 28 | 10.138.108.0/22 | 10.138.108.1 – 10.138.111.254 | 10.138.111.255 |
| 29 | 10.138.112.0/22 | 10.138.112.1 – 10.138.115.254 | 10.138.115.255 |
| 30 | 10.138.116.0/22 | 10.138.116.1 – 10.138.119.254 | 10.138.119.255 |
| 31 | 10.138.120.0/22 | 10.138.120.1 – 10.138.123.254 | 10.138.123.255 |
| 32 | 10.138.124.0/22 | 10.138.124.1 – 10.138.127.254 | 10.138.127.255 |
| 33 | 10.138.128.0/22 | 10.138.128.1 – 10.138.131.254 | 10.138.131.255 |
| 34 | 10.138.132.0/22 | 10.138.132.1 – 10.138.135.254 | 10.138.135.255 |
| 35 | 10.138.136.0/22 | 10.138.136.1 – 10.138.139.254 | 10.138.139.255 |
| 36 | 10.138.140.0/22 | 10.138.140.1 – 10.138.143.254 | 10.138.143.255 |
| 37 | 10.138.144.0/22 | 10.138.144.1 – 10.138.147.254 | 10.138.147.255 |
| 38 | 10.138.148.0/22 | 10.138.148.1 – 10.138.151.254 | 10.138.151.255 |
| 39 | 10.138.152.0/22 | 10.138.152.1 – 10.138.155.254 | 10.138.155.255 |
| 40 | 10.138.156.0/22 | 10.138.156.1 – 10.138.159.254 | 10.138.159.255 |
| 41 | 10.138.160.0/22 | 10.138.160.1 – 10.138.163.254 | 10.138.163.255 |
| 42 | 10.138.164.0/22 | 10.138.164.1 – 10.138.167.254 | 10.138.167.255 |
| 43 | 10.138.168.0/22 | 10.138.168.1 – 10.138.171.254 | 10.138.171.255 |
| 44 | 10.138.172.0/22 | 10.138.172.1 – 10.138.175.254 | 10.138.175.255 |
| 45 | 10.138.176.0/22 | 10.138.176.1 – 10.138.179.254 | 10.138.179.255 |
| 46 | 10.138.180.0/22 | 10.138.180.1 – 10.138.183.254 | 10.138.183.255 |
| 47 | 10.138.184.0/22 | 10.138.184.1 – 10.138.187.254 | 10.138.187.255 |
| 48 | 10.138.188.0/22 | 10.138.188.1 – 10.138.191.254 | 10.138.191.255 |
| 49 | 10.138.192.0/22 | 10.138.192.1 – 10.138.195.254 | 10.138.195.255 |
| 50 | 10.138.196.0/22 | 10.138.196.1 – 10.138.199.254 | 10.138.199.255 |
| 51 | 10.138.200.0/22 | 10.138.200.1 – 10.138.203.254 | 10.138.203.255 |
| 52 | 10.138.204.0/22 | 10.138.204.1 – 10.138.207.254 | 10.138.207.255 |
| 53 | 10.138.208.0/22 | 10.138.208.1 – 10.138.211.254 | 10.138.211.255 |
| 54 | 10.138.212.0/22 | 10.138.212.1 – 10.138.215.254 | 10.138.215.255 |
| 55 | 10.138.216.0/22 | 10.138.216.1 – 10.138.219.254 | 10.138.219.255 |
| 56 | 10.138.220.0/22 | 10.138.220.1 – 10.138.223.254 | 10.138.223.255 |
| 57 | 10.138.224.0/22 | 10.138.224.1 – 10.138.227.254 | 10.138.227.255 |
| 58 | 10.138.228.0/22 | 10.138.228.1 – 10.138.231.254 | 10.138.231.255 |
| 59 | 10.138.232.0/22 | 10.138.232.1 – 10.138.235.254 | 10.138.235.255 |
| 60 | 10.138.236.0/22 | 10.138.236.1 – 10.138.239.254 | 10.138.239.255 |
| 61 | 10.138.240.0/22 | 10.138.240.1 – 10.138.243.254 | 10.138.243.255 |
| 62 | 10.138.244.0/22 | 10.138.244.1 – 10.138.247.254 | 10.138.247.255 |
| 63 | 10.138.248.0/22 | 10.138.248.1 – 10.138.251.254 | 10.138.251.255 |
| 64 | 10.138.252.0/22 | 10.138.252.1 – 10.138.255.254 | 10.138.255.255 |
| 65 | 10.139.0.0/22 | 10.139.0.1 – 10.139.3.254 | 10.139.3.255 |
| 66 | 10.139.4.0/22 | 10.139.4.1 – 10.139.7.254 | 10.139.7.255 |
| 67 | 10.139.8.0/22 | 10.139.8.1 – 10.139.11.254 | 10.139.11.255 |
| 68 | 10.139.12.0/22 | 10.139.12.1 – 10.139.15.254 | 10.139.15.255 |
| 69 | 10.139.16.0/22 | 10.139.16.1 – 10.139.19.254 | 10.139.19.255 |
| 70 | 10.139.20.0/22 | 10.139.20.1 – 10.139.23.254 | 10.139.23.255 |
| 71 | 10.139.24.0/22 | 10.139.24.1 – 10.139.27.254 | 10.139.27.255 |
| 72 | 10.139.28.0/22 | 10.139.28.1 – 10.139.31.254 | 10.139.31.255 |
| 73 | 10.139.32.0/22 | 10.139.32.1 – 10.139.35.254 | 10.139.35.255 |
| 74 | 10.139.36.0/22 | 10.139.36.1 – 10.139.39.254 | 10.139.39.255 |
| 75 | 10.139.40.0/22 | 10.139.40.1 – 10.139.43.254 | 10.139.43.255 |
| 76 | 10.139.44.0/22 | 10.139.44.1 – 10.139.47.254 | 10.139.47.255 |
| 77 | 10.139.48.0/22 | 10.139.48.1 – 10.139.51.254 | 10.139.51.255 |
| 78 | 10.139.52.0/22 | 10.139.52.1 – 10.139.55.254 | 10.139.55.255 |
| 79 | 10.139.56.0/22 | 10.139.56.1 – 10.139.59.254 | 10.139.59.255 |
| 80 | 10.139.60.0/22 | 10.139.60.1 – 10.139.63.254 | 10.139.63.255 |
| 81 | 10.139.64.0/22 | 10.139.64.1 – 10.139.67.254 | 10.139.67.255 |
| 82 | 10.139.68.0/22 | 10.139.68.1 – 10.139.71.254 | 10.139.71.255 |
| 83 | 10.139.72.0/22 | 10.139.72.1 – 10.139.75.254 | 10.139.75.255 |
| 84 | 10.139.76.0/22 | 10.139.76.1 – 10.139.79.254 | 10.139.79.255 |
| 85 | 10.139.80.0/22 | 10.139.80.1 – 10.139.83.254 | 10.139.83.255 |
| 86 | 10.139.84.0/22 | 10.139.84.1 – 10.139.87.254 | 10.139.87.255 |
| 87 | 10.139.88.0/22 | 10.139.88.1 – 10.139.91.254 | 10.139.91.255 |
| 88 | 10.139.92.0/22 | 10.139.92.1 – 10.139.95.254 | 10.139.95.255 |
| 89 | 10.139.96.0/22 | 10.139.96.1 – 10.139.99.254 | 10.139.99.255 |
| 90 | 10.139.100.0/22 | 10.139.100.1 – 10.139.103.254 | 10.139.103.255 |
| 91 | 10.139.104.0/22 | 10.139.104.1 – 10.139.107.254 | 10.139.107.255 |
| 92 | 10.139.108.0/22 | 10.139.108.1 – 10.139.111.254 | 10.139.111.255 |
| 93 | 10.139.112.0/22 | 10.139.112.1 – 10.139.115.254 | 10.139.115.255 |
| 94 | 10.139.116.0/22 | 10.139.116.1 – 10.139.119.254 | 10.139.119.255 |
| 95 | 10.139.120.0/22 | 10.139.120.1 – 10.139.123.254 | 10.139.123.255 |
| 96 | 10.139.124.0/22 | 10.139.124.1 – 10.139.127.254 | 10.139.127.255 |
| 97 | 10.139.128.0/22 | 10.139.128.1 – 10.139.131.254 | 10.139.131.255 |
| 98 | 10.139.132.0/22 | 10.139.132.1 – 10.139.135.254 | 10.139.135.255 |
| 99 | 10.139.136.0/22 | 10.139.136.1 – 10.139.139.254 | 10.139.139.255 |
| 100 | 10.139.140.0/22 | 10.139.140.1 – 10.139.143.254 | 10.139.143.255 |
| 101 | 10.139.144.0/22 | 10.139.144.1 – 10.139.147.254 | 10.139.147.255 |
| 102 | 10.139.148.0/22 | 10.139.148.1 – 10.139.151.254 | 10.139.151.255 |
| 103 | 10.139.152.0/22 | 10.139.152.1 – 10.139.155.254 | 10.139.155.255 |
| 104 | 10.139.156.0/22 | 10.139.156.1 – 10.139.159.254 | 10.139.159.255 |
| 105 | 10.139.160.0/22 | 10.139.160.1 – 10.139.163.254 | 10.139.163.255 |
| 106 | 10.139.164.0/22 | 10.139.164.1 – 10.139.167.254 | 10.139.167.255 |
| 107 | 10.139.168.0/22 | 10.139.168.1 – 10.139.171.254 | 10.139.171.255 |
| 108 | 10.139.172.0/22 | 10.139.172.1 – 10.139.175.254 | 10.139.175.255 |
| 109 | 10.139.176.0/22 | 10.139.176.1 – 10.139.179.254 | 10.139.179.255 |
| 110 | 10.139.180.0/22 | 10.139.180.1 – 10.139.183.254 | 10.139.183.255 |
| 111 | 10.139.184.0/22 | 10.139.184.1 – 10.139.187.254 | 10.139.187.255 |
| 112 | 10.139.188.0/22 | 10.139.188.1 – 10.139.191.254 | 10.139.191.255 |
| 113 | 10.139.192.0/22 | 10.139.192.1 – 10.139.195.254 | 10.139.195.255 |
| 114 | 10.139.196.0/22 | 10.139.196.1 – 10.139.199.254 | 10.139.199.255 |
| 115 | 10.139.200.0/22 | 10.139.200.1 – 10.139.203.254 | 10.139.203.255 |
| 116 | 10.139.204.0/22 | 10.139.204.1 – 10.139.207.254 | 10.139.207.255 |
| 117 | 10.139.208.0/22 | 10.139.208.1 – 10.139.211.254 | 10.139.211.255 |
| 118 | 10.139.212.0/22 | 10.139.212.1 – 10.139.215.254 | 10.139.215.255 |
| 119 | 10.139.216.0/22 | 10.139.216.1 – 10.139.219.254 | 10.139.219.255 |
| 120 | 10.139.220.0/22 | 10.139.220.1 – 10.139.223.254 | 10.139.223.255 |
| 121 | 10.139.224.0/22 | 10.139.224.1 – 10.139.227.254 | 10.139.227.255 |
| 122 | 10.139.228.0/22 | 10.139.228.1 – 10.139.231.254 | 10.139.231.255 |
| 123 | 10.139.232.0/22 | 10.139.232.1 – 10.139.235.254 | 10.139.235.255 |
| 124 | 10.139.236.0/22 | 10.139.236.1 – 10.139.239.254 | 10.139.239.255 |
| 125 | 10.139.240.0/22 | 10.139.240.1 – 10.139.243.254 | 10.139.243.255 |
| 126 | 10.139.244.0/22 | 10.139.244.1 – 10.139.247.254 | 10.139.247.255 |
| 127 | 10.139.248.0/22 | 10.139.248.1 – 10.139.251.254 | 10.139.251.255 |
| 128 | 10.139.252.0/22 | 10.139.252.1 – 10.139.255.254 | 10.139.255.255 |
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.