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)10.120.0.0/13
network10.120.0.0/13
broadcast10.127.255.255
first host10.120.0.1
last host10.127.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.120.0.0/13
address00001010.01111000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.01111000.00000000.00000000
broadcast00001010.01111111.11111111.11111111
green = network part, grey = host part
hex0x0a780000
decimal175636480
reverse dns0.0.120.10.in-addr.arpa
ipv4-mapped::ffff:a78:0
/13 split into /20 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.120.0.0/20 | 10.120.0.1 – 10.120.15.254 | 10.120.15.255 |
| 2 | 10.120.16.0/20 | 10.120.16.1 – 10.120.31.254 | 10.120.31.255 |
| 3 | 10.120.32.0/20 | 10.120.32.1 – 10.120.47.254 | 10.120.47.255 |
| 4 | 10.120.48.0/20 | 10.120.48.1 – 10.120.63.254 | 10.120.63.255 |
| 5 | 10.120.64.0/20 | 10.120.64.1 – 10.120.79.254 | 10.120.79.255 |
| 6 | 10.120.80.0/20 | 10.120.80.1 – 10.120.95.254 | 10.120.95.255 |
| 7 | 10.120.96.0/20 | 10.120.96.1 – 10.120.111.254 | 10.120.111.255 |
| 8 | 10.120.112.0/20 | 10.120.112.1 – 10.120.127.254 | 10.120.127.255 |
| 9 | 10.120.128.0/20 | 10.120.128.1 – 10.120.143.254 | 10.120.143.255 |
| 10 | 10.120.144.0/20 | 10.120.144.1 – 10.120.159.254 | 10.120.159.255 |
| 11 | 10.120.160.0/20 | 10.120.160.1 – 10.120.175.254 | 10.120.175.255 |
| 12 | 10.120.176.0/20 | 10.120.176.1 – 10.120.191.254 | 10.120.191.255 |
| 13 | 10.120.192.0/20 | 10.120.192.1 – 10.120.207.254 | 10.120.207.255 |
| 14 | 10.120.208.0/20 | 10.120.208.1 – 10.120.223.254 | 10.120.223.255 |
| 15 | 10.120.224.0/20 | 10.120.224.1 – 10.120.239.254 | 10.120.239.255 |
| 16 | 10.120.240.0/20 | 10.120.240.1 – 10.120.255.254 | 10.120.255.255 |
| 17 | 10.121.0.0/20 | 10.121.0.1 – 10.121.15.254 | 10.121.15.255 |
| 18 | 10.121.16.0/20 | 10.121.16.1 – 10.121.31.254 | 10.121.31.255 |
| 19 | 10.121.32.0/20 | 10.121.32.1 – 10.121.47.254 | 10.121.47.255 |
| 20 | 10.121.48.0/20 | 10.121.48.1 – 10.121.63.254 | 10.121.63.255 |
| 21 | 10.121.64.0/20 | 10.121.64.1 – 10.121.79.254 | 10.121.79.255 |
| 22 | 10.121.80.0/20 | 10.121.80.1 – 10.121.95.254 | 10.121.95.255 |
| 23 | 10.121.96.0/20 | 10.121.96.1 – 10.121.111.254 | 10.121.111.255 |
| 24 | 10.121.112.0/20 | 10.121.112.1 – 10.121.127.254 | 10.121.127.255 |
| 25 | 10.121.128.0/20 | 10.121.128.1 – 10.121.143.254 | 10.121.143.255 |
| 26 | 10.121.144.0/20 | 10.121.144.1 – 10.121.159.254 | 10.121.159.255 |
| 27 | 10.121.160.0/20 | 10.121.160.1 – 10.121.175.254 | 10.121.175.255 |
| 28 | 10.121.176.0/20 | 10.121.176.1 – 10.121.191.254 | 10.121.191.255 |
| 29 | 10.121.192.0/20 | 10.121.192.1 – 10.121.207.254 | 10.121.207.255 |
| 30 | 10.121.208.0/20 | 10.121.208.1 – 10.121.223.254 | 10.121.223.255 |
| 31 | 10.121.224.0/20 | 10.121.224.1 – 10.121.239.254 | 10.121.239.255 |
| 32 | 10.121.240.0/20 | 10.121.240.1 – 10.121.255.254 | 10.121.255.255 |
| 33 | 10.122.0.0/20 | 10.122.0.1 – 10.122.15.254 | 10.122.15.255 |
| 34 | 10.122.16.0/20 | 10.122.16.1 – 10.122.31.254 | 10.122.31.255 |
| 35 | 10.122.32.0/20 | 10.122.32.1 – 10.122.47.254 | 10.122.47.255 |
| 36 | 10.122.48.0/20 | 10.122.48.1 – 10.122.63.254 | 10.122.63.255 |
| 37 | 10.122.64.0/20 | 10.122.64.1 – 10.122.79.254 | 10.122.79.255 |
| 38 | 10.122.80.0/20 | 10.122.80.1 – 10.122.95.254 | 10.122.95.255 |
| 39 | 10.122.96.0/20 | 10.122.96.1 – 10.122.111.254 | 10.122.111.255 |
| 40 | 10.122.112.0/20 | 10.122.112.1 – 10.122.127.254 | 10.122.127.255 |
| 41 | 10.122.128.0/20 | 10.122.128.1 – 10.122.143.254 | 10.122.143.255 |
| 42 | 10.122.144.0/20 | 10.122.144.1 – 10.122.159.254 | 10.122.159.255 |
| 43 | 10.122.160.0/20 | 10.122.160.1 – 10.122.175.254 | 10.122.175.255 |
| 44 | 10.122.176.0/20 | 10.122.176.1 – 10.122.191.254 | 10.122.191.255 |
| 45 | 10.122.192.0/20 | 10.122.192.1 – 10.122.207.254 | 10.122.207.255 |
| 46 | 10.122.208.0/20 | 10.122.208.1 – 10.122.223.254 | 10.122.223.255 |
| 47 | 10.122.224.0/20 | 10.122.224.1 – 10.122.239.254 | 10.122.239.255 |
| 48 | 10.122.240.0/20 | 10.122.240.1 – 10.122.255.254 | 10.122.255.255 |
| 49 | 10.123.0.0/20 | 10.123.0.1 – 10.123.15.254 | 10.123.15.255 |
| 50 | 10.123.16.0/20 | 10.123.16.1 – 10.123.31.254 | 10.123.31.255 |
| 51 | 10.123.32.0/20 | 10.123.32.1 – 10.123.47.254 | 10.123.47.255 |
| 52 | 10.123.48.0/20 | 10.123.48.1 – 10.123.63.254 | 10.123.63.255 |
| 53 | 10.123.64.0/20 | 10.123.64.1 – 10.123.79.254 | 10.123.79.255 |
| 54 | 10.123.80.0/20 | 10.123.80.1 – 10.123.95.254 | 10.123.95.255 |
| 55 | 10.123.96.0/20 | 10.123.96.1 – 10.123.111.254 | 10.123.111.255 |
| 56 | 10.123.112.0/20 | 10.123.112.1 – 10.123.127.254 | 10.123.127.255 |
| 57 | 10.123.128.0/20 | 10.123.128.1 – 10.123.143.254 | 10.123.143.255 |
| 58 | 10.123.144.0/20 | 10.123.144.1 – 10.123.159.254 | 10.123.159.255 |
| 59 | 10.123.160.0/20 | 10.123.160.1 – 10.123.175.254 | 10.123.175.255 |
| 60 | 10.123.176.0/20 | 10.123.176.1 – 10.123.191.254 | 10.123.191.255 |
| 61 | 10.123.192.0/20 | 10.123.192.1 – 10.123.207.254 | 10.123.207.255 |
| 62 | 10.123.208.0/20 | 10.123.208.1 – 10.123.223.254 | 10.123.223.255 |
| 63 | 10.123.224.0/20 | 10.123.224.1 – 10.123.239.254 | 10.123.239.255 |
| 64 | 10.123.240.0/20 | 10.123.240.1 – 10.123.255.254 | 10.123.255.255 |
| 65 | 10.124.0.0/20 | 10.124.0.1 – 10.124.15.254 | 10.124.15.255 |
| 66 | 10.124.16.0/20 | 10.124.16.1 – 10.124.31.254 | 10.124.31.255 |
| 67 | 10.124.32.0/20 | 10.124.32.1 – 10.124.47.254 | 10.124.47.255 |
| 68 | 10.124.48.0/20 | 10.124.48.1 – 10.124.63.254 | 10.124.63.255 |
| 69 | 10.124.64.0/20 | 10.124.64.1 – 10.124.79.254 | 10.124.79.255 |
| 70 | 10.124.80.0/20 | 10.124.80.1 – 10.124.95.254 | 10.124.95.255 |
| 71 | 10.124.96.0/20 | 10.124.96.1 – 10.124.111.254 | 10.124.111.255 |
| 72 | 10.124.112.0/20 | 10.124.112.1 – 10.124.127.254 | 10.124.127.255 |
| 73 | 10.124.128.0/20 | 10.124.128.1 – 10.124.143.254 | 10.124.143.255 |
| 74 | 10.124.144.0/20 | 10.124.144.1 – 10.124.159.254 | 10.124.159.255 |
| 75 | 10.124.160.0/20 | 10.124.160.1 – 10.124.175.254 | 10.124.175.255 |
| 76 | 10.124.176.0/20 | 10.124.176.1 – 10.124.191.254 | 10.124.191.255 |
| 77 | 10.124.192.0/20 | 10.124.192.1 – 10.124.207.254 | 10.124.207.255 |
| 78 | 10.124.208.0/20 | 10.124.208.1 – 10.124.223.254 | 10.124.223.255 |
| 79 | 10.124.224.0/20 | 10.124.224.1 – 10.124.239.254 | 10.124.239.255 |
| 80 | 10.124.240.0/20 | 10.124.240.1 – 10.124.255.254 | 10.124.255.255 |
| 81 | 10.125.0.0/20 | 10.125.0.1 – 10.125.15.254 | 10.125.15.255 |
| 82 | 10.125.16.0/20 | 10.125.16.1 – 10.125.31.254 | 10.125.31.255 |
| 83 | 10.125.32.0/20 | 10.125.32.1 – 10.125.47.254 | 10.125.47.255 |
| 84 | 10.125.48.0/20 | 10.125.48.1 – 10.125.63.254 | 10.125.63.255 |
| 85 | 10.125.64.0/20 | 10.125.64.1 – 10.125.79.254 | 10.125.79.255 |
| 86 | 10.125.80.0/20 | 10.125.80.1 – 10.125.95.254 | 10.125.95.255 |
| 87 | 10.125.96.0/20 | 10.125.96.1 – 10.125.111.254 | 10.125.111.255 |
| 88 | 10.125.112.0/20 | 10.125.112.1 – 10.125.127.254 | 10.125.127.255 |
| 89 | 10.125.128.0/20 | 10.125.128.1 – 10.125.143.254 | 10.125.143.255 |
| 90 | 10.125.144.0/20 | 10.125.144.1 – 10.125.159.254 | 10.125.159.255 |
| 91 | 10.125.160.0/20 | 10.125.160.1 – 10.125.175.254 | 10.125.175.255 |
| 92 | 10.125.176.0/20 | 10.125.176.1 – 10.125.191.254 | 10.125.191.255 |
| 93 | 10.125.192.0/20 | 10.125.192.1 – 10.125.207.254 | 10.125.207.255 |
| 94 | 10.125.208.0/20 | 10.125.208.1 – 10.125.223.254 | 10.125.223.255 |
| 95 | 10.125.224.0/20 | 10.125.224.1 – 10.125.239.254 | 10.125.239.255 |
| 96 | 10.125.240.0/20 | 10.125.240.1 – 10.125.255.254 | 10.125.255.255 |
| 97 | 10.126.0.0/20 | 10.126.0.1 – 10.126.15.254 | 10.126.15.255 |
| 98 | 10.126.16.0/20 | 10.126.16.1 – 10.126.31.254 | 10.126.31.255 |
| 99 | 10.126.32.0/20 | 10.126.32.1 – 10.126.47.254 | 10.126.47.255 |
| 100 | 10.126.48.0/20 | 10.126.48.1 – 10.126.63.254 | 10.126.63.255 |
| 101 | 10.126.64.0/20 | 10.126.64.1 – 10.126.79.254 | 10.126.79.255 |
| 102 | 10.126.80.0/20 | 10.126.80.1 – 10.126.95.254 | 10.126.95.255 |
| 103 | 10.126.96.0/20 | 10.126.96.1 – 10.126.111.254 | 10.126.111.255 |
| 104 | 10.126.112.0/20 | 10.126.112.1 – 10.126.127.254 | 10.126.127.255 |
| 105 | 10.126.128.0/20 | 10.126.128.1 – 10.126.143.254 | 10.126.143.255 |
| 106 | 10.126.144.0/20 | 10.126.144.1 – 10.126.159.254 | 10.126.159.255 |
| 107 | 10.126.160.0/20 | 10.126.160.1 – 10.126.175.254 | 10.126.175.255 |
| 108 | 10.126.176.0/20 | 10.126.176.1 – 10.126.191.254 | 10.126.191.255 |
| 109 | 10.126.192.0/20 | 10.126.192.1 – 10.126.207.254 | 10.126.207.255 |
| 110 | 10.126.208.0/20 | 10.126.208.1 – 10.126.223.254 | 10.126.223.255 |
| 111 | 10.126.224.0/20 | 10.126.224.1 – 10.126.239.254 | 10.126.239.255 |
| 112 | 10.126.240.0/20 | 10.126.240.1 – 10.126.255.254 | 10.126.255.255 |
| 113 | 10.127.0.0/20 | 10.127.0.1 – 10.127.15.254 | 10.127.15.255 |
| 114 | 10.127.16.0/20 | 10.127.16.1 – 10.127.31.254 | 10.127.31.255 |
| 115 | 10.127.32.0/20 | 10.127.32.1 – 10.127.47.254 | 10.127.47.255 |
| 116 | 10.127.48.0/20 | 10.127.48.1 – 10.127.63.254 | 10.127.63.255 |
| 117 | 10.127.64.0/20 | 10.127.64.1 – 10.127.79.254 | 10.127.79.255 |
| 118 | 10.127.80.0/20 | 10.127.80.1 – 10.127.95.254 | 10.127.95.255 |
| 119 | 10.127.96.0/20 | 10.127.96.1 – 10.127.111.254 | 10.127.111.255 |
| 120 | 10.127.112.0/20 | 10.127.112.1 – 10.127.127.254 | 10.127.127.255 |
| 121 | 10.127.128.0/20 | 10.127.128.1 – 10.127.143.254 | 10.127.143.255 |
| 122 | 10.127.144.0/20 | 10.127.144.1 – 10.127.159.254 | 10.127.159.255 |
| 123 | 10.127.160.0/20 | 10.127.160.1 – 10.127.175.254 | 10.127.175.255 |
| 124 | 10.127.176.0/20 | 10.127.176.1 – 10.127.191.254 | 10.127.191.255 |
| 125 | 10.127.192.0/20 | 10.127.192.1 – 10.127.207.254 | 10.127.207.255 |
| 126 | 10.127.208.0/20 | 10.127.208.1 – 10.127.223.254 | 10.127.223.255 |
| 127 | 10.127.224.0/20 | 10.127.224.1 – 10.127.239.254 | 10.127.239.255 |
| 128 | 10.127.240.0/20 | 10.127.240.1 – 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 /13 |
|---|---|---|---|---|
| /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 | 1 |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 2 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 4 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 8 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 16 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 32 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 64 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 128 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 256 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 512 split → |
| /23 | 255.255.254.0 | 512 | 510 | 1,024 split → |
| /24 | 255.255.255.0 | 256 | 254 | 2,048 split → |
| /25 | 255.255.255.128 | 128 | 126 | 4,096 split → |
| /26 | 255.255.255.192 | 64 | 62 | 8,192 split → |
| /27 | 255.255.255.224 | 32 | 30 | 16,384 split → |
| /28 | 255.255.255.240 | 16 | 14 | 32,768 split → |
| /29 | 255.255.255.248 | 8 | 6 | 65,536 split → |
| /30 | 255.255.255.252 | 4 | 2 | 131,072 split → |
| /31 | 255.255.255.254 | 2 | 2 | 262,144 split → |
| /32 | 255.255.255.255 | 1 | 1 | 524,288 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.