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)10.242.0.0/15
network10.242.0.0/15
broadcast10.243.255.255
first host10.242.0.1
last host10.243.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.242.0.0/15
address00001010.11110010.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11110010.00000000.00000000
broadcast00001010.11110011.11111111.11111111
green = network part, grey = host part
hex0x0af20000
decimal183631872
reverse dns0.0.242.10.in-addr.arpa
ipv4-mapped::ffff:af2:0
/15 split into /22 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.242.0.0/22 | 10.242.0.1 – 10.242.3.254 | 10.242.3.255 |
| 2 | 10.242.4.0/22 | 10.242.4.1 – 10.242.7.254 | 10.242.7.255 |
| 3 | 10.242.8.0/22 | 10.242.8.1 – 10.242.11.254 | 10.242.11.255 |
| 4 | 10.242.12.0/22 | 10.242.12.1 – 10.242.15.254 | 10.242.15.255 |
| 5 | 10.242.16.0/22 | 10.242.16.1 – 10.242.19.254 | 10.242.19.255 |
| 6 | 10.242.20.0/22 | 10.242.20.1 – 10.242.23.254 | 10.242.23.255 |
| 7 | 10.242.24.0/22 | 10.242.24.1 – 10.242.27.254 | 10.242.27.255 |
| 8 | 10.242.28.0/22 | 10.242.28.1 – 10.242.31.254 | 10.242.31.255 |
| 9 | 10.242.32.0/22 | 10.242.32.1 – 10.242.35.254 | 10.242.35.255 |
| 10 | 10.242.36.0/22 | 10.242.36.1 – 10.242.39.254 | 10.242.39.255 |
| 11 | 10.242.40.0/22 | 10.242.40.1 – 10.242.43.254 | 10.242.43.255 |
| 12 | 10.242.44.0/22 | 10.242.44.1 – 10.242.47.254 | 10.242.47.255 |
| 13 | 10.242.48.0/22 | 10.242.48.1 – 10.242.51.254 | 10.242.51.255 |
| 14 | 10.242.52.0/22 | 10.242.52.1 – 10.242.55.254 | 10.242.55.255 |
| 15 | 10.242.56.0/22 | 10.242.56.1 – 10.242.59.254 | 10.242.59.255 |
| 16 | 10.242.60.0/22 | 10.242.60.1 – 10.242.63.254 | 10.242.63.255 |
| 17 | 10.242.64.0/22 | 10.242.64.1 – 10.242.67.254 | 10.242.67.255 |
| 18 | 10.242.68.0/22 | 10.242.68.1 – 10.242.71.254 | 10.242.71.255 |
| 19 | 10.242.72.0/22 | 10.242.72.1 – 10.242.75.254 | 10.242.75.255 |
| 20 | 10.242.76.0/22 | 10.242.76.1 – 10.242.79.254 | 10.242.79.255 |
| 21 | 10.242.80.0/22 | 10.242.80.1 – 10.242.83.254 | 10.242.83.255 |
| 22 | 10.242.84.0/22 | 10.242.84.1 – 10.242.87.254 | 10.242.87.255 |
| 23 | 10.242.88.0/22 | 10.242.88.1 – 10.242.91.254 | 10.242.91.255 |
| 24 | 10.242.92.0/22 | 10.242.92.1 – 10.242.95.254 | 10.242.95.255 |
| 25 | 10.242.96.0/22 | 10.242.96.1 – 10.242.99.254 | 10.242.99.255 |
| 26 | 10.242.100.0/22 | 10.242.100.1 – 10.242.103.254 | 10.242.103.255 |
| 27 | 10.242.104.0/22 | 10.242.104.1 – 10.242.107.254 | 10.242.107.255 |
| 28 | 10.242.108.0/22 | 10.242.108.1 – 10.242.111.254 | 10.242.111.255 |
| 29 | 10.242.112.0/22 | 10.242.112.1 – 10.242.115.254 | 10.242.115.255 |
| 30 | 10.242.116.0/22 | 10.242.116.1 – 10.242.119.254 | 10.242.119.255 |
| 31 | 10.242.120.0/22 | 10.242.120.1 – 10.242.123.254 | 10.242.123.255 |
| 32 | 10.242.124.0/22 | 10.242.124.1 – 10.242.127.254 | 10.242.127.255 |
| 33 | 10.242.128.0/22 | 10.242.128.1 – 10.242.131.254 | 10.242.131.255 |
| 34 | 10.242.132.0/22 | 10.242.132.1 – 10.242.135.254 | 10.242.135.255 |
| 35 | 10.242.136.0/22 | 10.242.136.1 – 10.242.139.254 | 10.242.139.255 |
| 36 | 10.242.140.0/22 | 10.242.140.1 – 10.242.143.254 | 10.242.143.255 |
| 37 | 10.242.144.0/22 | 10.242.144.1 – 10.242.147.254 | 10.242.147.255 |
| 38 | 10.242.148.0/22 | 10.242.148.1 – 10.242.151.254 | 10.242.151.255 |
| 39 | 10.242.152.0/22 | 10.242.152.1 – 10.242.155.254 | 10.242.155.255 |
| 40 | 10.242.156.0/22 | 10.242.156.1 – 10.242.159.254 | 10.242.159.255 |
| 41 | 10.242.160.0/22 | 10.242.160.1 – 10.242.163.254 | 10.242.163.255 |
| 42 | 10.242.164.0/22 | 10.242.164.1 – 10.242.167.254 | 10.242.167.255 |
| 43 | 10.242.168.0/22 | 10.242.168.1 – 10.242.171.254 | 10.242.171.255 |
| 44 | 10.242.172.0/22 | 10.242.172.1 – 10.242.175.254 | 10.242.175.255 |
| 45 | 10.242.176.0/22 | 10.242.176.1 – 10.242.179.254 | 10.242.179.255 |
| 46 | 10.242.180.0/22 | 10.242.180.1 – 10.242.183.254 | 10.242.183.255 |
| 47 | 10.242.184.0/22 | 10.242.184.1 – 10.242.187.254 | 10.242.187.255 |
| 48 | 10.242.188.0/22 | 10.242.188.1 – 10.242.191.254 | 10.242.191.255 |
| 49 | 10.242.192.0/22 | 10.242.192.1 – 10.242.195.254 | 10.242.195.255 |
| 50 | 10.242.196.0/22 | 10.242.196.1 – 10.242.199.254 | 10.242.199.255 |
| 51 | 10.242.200.0/22 | 10.242.200.1 – 10.242.203.254 | 10.242.203.255 |
| 52 | 10.242.204.0/22 | 10.242.204.1 – 10.242.207.254 | 10.242.207.255 |
| 53 | 10.242.208.0/22 | 10.242.208.1 – 10.242.211.254 | 10.242.211.255 |
| 54 | 10.242.212.0/22 | 10.242.212.1 – 10.242.215.254 | 10.242.215.255 |
| 55 | 10.242.216.0/22 | 10.242.216.1 – 10.242.219.254 | 10.242.219.255 |
| 56 | 10.242.220.0/22 | 10.242.220.1 – 10.242.223.254 | 10.242.223.255 |
| 57 | 10.242.224.0/22 | 10.242.224.1 – 10.242.227.254 | 10.242.227.255 |
| 58 | 10.242.228.0/22 | 10.242.228.1 – 10.242.231.254 | 10.242.231.255 |
| 59 | 10.242.232.0/22 | 10.242.232.1 – 10.242.235.254 | 10.242.235.255 |
| 60 | 10.242.236.0/22 | 10.242.236.1 – 10.242.239.254 | 10.242.239.255 |
| 61 | 10.242.240.0/22 | 10.242.240.1 – 10.242.243.254 | 10.242.243.255 |
| 62 | 10.242.244.0/22 | 10.242.244.1 – 10.242.247.254 | 10.242.247.255 |
| 63 | 10.242.248.0/22 | 10.242.248.1 – 10.242.251.254 | 10.242.251.255 |
| 64 | 10.242.252.0/22 | 10.242.252.1 – 10.242.255.254 | 10.242.255.255 |
| 65 | 10.243.0.0/22 | 10.243.0.1 – 10.243.3.254 | 10.243.3.255 |
| 66 | 10.243.4.0/22 | 10.243.4.1 – 10.243.7.254 | 10.243.7.255 |
| 67 | 10.243.8.0/22 | 10.243.8.1 – 10.243.11.254 | 10.243.11.255 |
| 68 | 10.243.12.0/22 | 10.243.12.1 – 10.243.15.254 | 10.243.15.255 |
| 69 | 10.243.16.0/22 | 10.243.16.1 – 10.243.19.254 | 10.243.19.255 |
| 70 | 10.243.20.0/22 | 10.243.20.1 – 10.243.23.254 | 10.243.23.255 |
| 71 | 10.243.24.0/22 | 10.243.24.1 – 10.243.27.254 | 10.243.27.255 |
| 72 | 10.243.28.0/22 | 10.243.28.1 – 10.243.31.254 | 10.243.31.255 |
| 73 | 10.243.32.0/22 | 10.243.32.1 – 10.243.35.254 | 10.243.35.255 |
| 74 | 10.243.36.0/22 | 10.243.36.1 – 10.243.39.254 | 10.243.39.255 |
| 75 | 10.243.40.0/22 | 10.243.40.1 – 10.243.43.254 | 10.243.43.255 |
| 76 | 10.243.44.0/22 | 10.243.44.1 – 10.243.47.254 | 10.243.47.255 |
| 77 | 10.243.48.0/22 | 10.243.48.1 – 10.243.51.254 | 10.243.51.255 |
| 78 | 10.243.52.0/22 | 10.243.52.1 – 10.243.55.254 | 10.243.55.255 |
| 79 | 10.243.56.0/22 | 10.243.56.1 – 10.243.59.254 | 10.243.59.255 |
| 80 | 10.243.60.0/22 | 10.243.60.1 – 10.243.63.254 | 10.243.63.255 |
| 81 | 10.243.64.0/22 | 10.243.64.1 – 10.243.67.254 | 10.243.67.255 |
| 82 | 10.243.68.0/22 | 10.243.68.1 – 10.243.71.254 | 10.243.71.255 |
| 83 | 10.243.72.0/22 | 10.243.72.1 – 10.243.75.254 | 10.243.75.255 |
| 84 | 10.243.76.0/22 | 10.243.76.1 – 10.243.79.254 | 10.243.79.255 |
| 85 | 10.243.80.0/22 | 10.243.80.1 – 10.243.83.254 | 10.243.83.255 |
| 86 | 10.243.84.0/22 | 10.243.84.1 – 10.243.87.254 | 10.243.87.255 |
| 87 | 10.243.88.0/22 | 10.243.88.1 – 10.243.91.254 | 10.243.91.255 |
| 88 | 10.243.92.0/22 | 10.243.92.1 – 10.243.95.254 | 10.243.95.255 |
| 89 | 10.243.96.0/22 | 10.243.96.1 – 10.243.99.254 | 10.243.99.255 |
| 90 | 10.243.100.0/22 | 10.243.100.1 – 10.243.103.254 | 10.243.103.255 |
| 91 | 10.243.104.0/22 | 10.243.104.1 – 10.243.107.254 | 10.243.107.255 |
| 92 | 10.243.108.0/22 | 10.243.108.1 – 10.243.111.254 | 10.243.111.255 |
| 93 | 10.243.112.0/22 | 10.243.112.1 – 10.243.115.254 | 10.243.115.255 |
| 94 | 10.243.116.0/22 | 10.243.116.1 – 10.243.119.254 | 10.243.119.255 |
| 95 | 10.243.120.0/22 | 10.243.120.1 – 10.243.123.254 | 10.243.123.255 |
| 96 | 10.243.124.0/22 | 10.243.124.1 – 10.243.127.254 | 10.243.127.255 |
| 97 | 10.243.128.0/22 | 10.243.128.1 – 10.243.131.254 | 10.243.131.255 |
| 98 | 10.243.132.0/22 | 10.243.132.1 – 10.243.135.254 | 10.243.135.255 |
| 99 | 10.243.136.0/22 | 10.243.136.1 – 10.243.139.254 | 10.243.139.255 |
| 100 | 10.243.140.0/22 | 10.243.140.1 – 10.243.143.254 | 10.243.143.255 |
| 101 | 10.243.144.0/22 | 10.243.144.1 – 10.243.147.254 | 10.243.147.255 |
| 102 | 10.243.148.0/22 | 10.243.148.1 – 10.243.151.254 | 10.243.151.255 |
| 103 | 10.243.152.0/22 | 10.243.152.1 – 10.243.155.254 | 10.243.155.255 |
| 104 | 10.243.156.0/22 | 10.243.156.1 – 10.243.159.254 | 10.243.159.255 |
| 105 | 10.243.160.0/22 | 10.243.160.1 – 10.243.163.254 | 10.243.163.255 |
| 106 | 10.243.164.0/22 | 10.243.164.1 – 10.243.167.254 | 10.243.167.255 |
| 107 | 10.243.168.0/22 | 10.243.168.1 – 10.243.171.254 | 10.243.171.255 |
| 108 | 10.243.172.0/22 | 10.243.172.1 – 10.243.175.254 | 10.243.175.255 |
| 109 | 10.243.176.0/22 | 10.243.176.1 – 10.243.179.254 | 10.243.179.255 |
| 110 | 10.243.180.0/22 | 10.243.180.1 – 10.243.183.254 | 10.243.183.255 |
| 111 | 10.243.184.0/22 | 10.243.184.1 – 10.243.187.254 | 10.243.187.255 |
| 112 | 10.243.188.0/22 | 10.243.188.1 – 10.243.191.254 | 10.243.191.255 |
| 113 | 10.243.192.0/22 | 10.243.192.1 – 10.243.195.254 | 10.243.195.255 |
| 114 | 10.243.196.0/22 | 10.243.196.1 – 10.243.199.254 | 10.243.199.255 |
| 115 | 10.243.200.0/22 | 10.243.200.1 – 10.243.203.254 | 10.243.203.255 |
| 116 | 10.243.204.0/22 | 10.243.204.1 – 10.243.207.254 | 10.243.207.255 |
| 117 | 10.243.208.0/22 | 10.243.208.1 – 10.243.211.254 | 10.243.211.255 |
| 118 | 10.243.212.0/22 | 10.243.212.1 – 10.243.215.254 | 10.243.215.255 |
| 119 | 10.243.216.0/22 | 10.243.216.1 – 10.243.219.254 | 10.243.219.255 |
| 120 | 10.243.220.0/22 | 10.243.220.1 – 10.243.223.254 | 10.243.223.255 |
| 121 | 10.243.224.0/22 | 10.243.224.1 – 10.243.227.254 | 10.243.227.255 |
| 122 | 10.243.228.0/22 | 10.243.228.1 – 10.243.231.254 | 10.243.231.255 |
| 123 | 10.243.232.0/22 | 10.243.232.1 – 10.243.235.254 | 10.243.235.255 |
| 124 | 10.243.236.0/22 | 10.243.236.1 – 10.243.239.254 | 10.243.239.255 |
| 125 | 10.243.240.0/22 | 10.243.240.1 – 10.243.243.254 | 10.243.243.255 |
| 126 | 10.243.244.0/22 | 10.243.244.1 – 10.243.247.254 | 10.243.247.255 |
| 127 | 10.243.248.0/22 | 10.243.248.1 – 10.243.251.254 | 10.243.251.255 |
| 128 | 10.243.252.0/22 | 10.243.252.1 – 10.243.255.254 | 10.243.255.255 |
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.