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)10.128.0.0/13
network10.128.0.0/13
broadcast10.135.255.255
first host10.128.0.1
last host10.135.255.254
subnet mask255.248.0.0
wildcard0.7.255.255
addresses524,288
usable hosts524,286
classA
ipcalc 10.128.0.0/13
address00001010.10000000.00000000.00000000
subnet mask11111111.11111000.00000000.00000000
network00001010.10000000.00000000.00000000
broadcast00001010.10000111.11111111.11111111
green = network part, grey = host part
hex0x0a800000
decimal176160768
reverse dns0.0.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:0
/13 split into /20 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.128.0.0/20 | 10.128.0.1 – 10.128.15.254 | 10.128.15.255 |
| 2 | 10.128.16.0/20 | 10.128.16.1 – 10.128.31.254 | 10.128.31.255 |
| 3 | 10.128.32.0/20 | 10.128.32.1 – 10.128.47.254 | 10.128.47.255 |
| 4 | 10.128.48.0/20 | 10.128.48.1 – 10.128.63.254 | 10.128.63.255 |
| 5 | 10.128.64.0/20 | 10.128.64.1 – 10.128.79.254 | 10.128.79.255 |
| 6 | 10.128.80.0/20 | 10.128.80.1 – 10.128.95.254 | 10.128.95.255 |
| 7 | 10.128.96.0/20 | 10.128.96.1 – 10.128.111.254 | 10.128.111.255 |
| 8 | 10.128.112.0/20 | 10.128.112.1 – 10.128.127.254 | 10.128.127.255 |
| 9 | 10.128.128.0/20 | 10.128.128.1 – 10.128.143.254 | 10.128.143.255 |
| 10 | 10.128.144.0/20 | 10.128.144.1 – 10.128.159.254 | 10.128.159.255 |
| 11 | 10.128.160.0/20 | 10.128.160.1 – 10.128.175.254 | 10.128.175.255 |
| 12 | 10.128.176.0/20 | 10.128.176.1 – 10.128.191.254 | 10.128.191.255 |
| 13 | 10.128.192.0/20 | 10.128.192.1 – 10.128.207.254 | 10.128.207.255 |
| 14 | 10.128.208.0/20 | 10.128.208.1 – 10.128.223.254 | 10.128.223.255 |
| 15 | 10.128.224.0/20 | 10.128.224.1 – 10.128.239.254 | 10.128.239.255 |
| 16 | 10.128.240.0/20 | 10.128.240.1 – 10.128.255.254 | 10.128.255.255 |
| 17 | 10.129.0.0/20 | 10.129.0.1 – 10.129.15.254 | 10.129.15.255 |
| 18 | 10.129.16.0/20 | 10.129.16.1 – 10.129.31.254 | 10.129.31.255 |
| 19 | 10.129.32.0/20 | 10.129.32.1 – 10.129.47.254 | 10.129.47.255 |
| 20 | 10.129.48.0/20 | 10.129.48.1 – 10.129.63.254 | 10.129.63.255 |
| 21 | 10.129.64.0/20 | 10.129.64.1 – 10.129.79.254 | 10.129.79.255 |
| 22 | 10.129.80.0/20 | 10.129.80.1 – 10.129.95.254 | 10.129.95.255 |
| 23 | 10.129.96.0/20 | 10.129.96.1 – 10.129.111.254 | 10.129.111.255 |
| 24 | 10.129.112.0/20 | 10.129.112.1 – 10.129.127.254 | 10.129.127.255 |
| 25 | 10.129.128.0/20 | 10.129.128.1 – 10.129.143.254 | 10.129.143.255 |
| 26 | 10.129.144.0/20 | 10.129.144.1 – 10.129.159.254 | 10.129.159.255 |
| 27 | 10.129.160.0/20 | 10.129.160.1 – 10.129.175.254 | 10.129.175.255 |
| 28 | 10.129.176.0/20 | 10.129.176.1 – 10.129.191.254 | 10.129.191.255 |
| 29 | 10.129.192.0/20 | 10.129.192.1 – 10.129.207.254 | 10.129.207.255 |
| 30 | 10.129.208.0/20 | 10.129.208.1 – 10.129.223.254 | 10.129.223.255 |
| 31 | 10.129.224.0/20 | 10.129.224.1 – 10.129.239.254 | 10.129.239.255 |
| 32 | 10.129.240.0/20 | 10.129.240.1 – 10.129.255.254 | 10.129.255.255 |
| 33 | 10.130.0.0/20 | 10.130.0.1 – 10.130.15.254 | 10.130.15.255 |
| 34 | 10.130.16.0/20 | 10.130.16.1 – 10.130.31.254 | 10.130.31.255 |
| 35 | 10.130.32.0/20 | 10.130.32.1 – 10.130.47.254 | 10.130.47.255 |
| 36 | 10.130.48.0/20 | 10.130.48.1 – 10.130.63.254 | 10.130.63.255 |
| 37 | 10.130.64.0/20 | 10.130.64.1 – 10.130.79.254 | 10.130.79.255 |
| 38 | 10.130.80.0/20 | 10.130.80.1 – 10.130.95.254 | 10.130.95.255 |
| 39 | 10.130.96.0/20 | 10.130.96.1 – 10.130.111.254 | 10.130.111.255 |
| 40 | 10.130.112.0/20 | 10.130.112.1 – 10.130.127.254 | 10.130.127.255 |
| 41 | 10.130.128.0/20 | 10.130.128.1 – 10.130.143.254 | 10.130.143.255 |
| 42 | 10.130.144.0/20 | 10.130.144.1 – 10.130.159.254 | 10.130.159.255 |
| 43 | 10.130.160.0/20 | 10.130.160.1 – 10.130.175.254 | 10.130.175.255 |
| 44 | 10.130.176.0/20 | 10.130.176.1 – 10.130.191.254 | 10.130.191.255 |
| 45 | 10.130.192.0/20 | 10.130.192.1 – 10.130.207.254 | 10.130.207.255 |
| 46 | 10.130.208.0/20 | 10.130.208.1 – 10.130.223.254 | 10.130.223.255 |
| 47 | 10.130.224.0/20 | 10.130.224.1 – 10.130.239.254 | 10.130.239.255 |
| 48 | 10.130.240.0/20 | 10.130.240.1 – 10.130.255.254 | 10.130.255.255 |
| 49 | 10.131.0.0/20 | 10.131.0.1 – 10.131.15.254 | 10.131.15.255 |
| 50 | 10.131.16.0/20 | 10.131.16.1 – 10.131.31.254 | 10.131.31.255 |
| 51 | 10.131.32.0/20 | 10.131.32.1 – 10.131.47.254 | 10.131.47.255 |
| 52 | 10.131.48.0/20 | 10.131.48.1 – 10.131.63.254 | 10.131.63.255 |
| 53 | 10.131.64.0/20 | 10.131.64.1 – 10.131.79.254 | 10.131.79.255 |
| 54 | 10.131.80.0/20 | 10.131.80.1 – 10.131.95.254 | 10.131.95.255 |
| 55 | 10.131.96.0/20 | 10.131.96.1 – 10.131.111.254 | 10.131.111.255 |
| 56 | 10.131.112.0/20 | 10.131.112.1 – 10.131.127.254 | 10.131.127.255 |
| 57 | 10.131.128.0/20 | 10.131.128.1 – 10.131.143.254 | 10.131.143.255 |
| 58 | 10.131.144.0/20 | 10.131.144.1 – 10.131.159.254 | 10.131.159.255 |
| 59 | 10.131.160.0/20 | 10.131.160.1 – 10.131.175.254 | 10.131.175.255 |
| 60 | 10.131.176.0/20 | 10.131.176.1 – 10.131.191.254 | 10.131.191.255 |
| 61 | 10.131.192.0/20 | 10.131.192.1 – 10.131.207.254 | 10.131.207.255 |
| 62 | 10.131.208.0/20 | 10.131.208.1 – 10.131.223.254 | 10.131.223.255 |
| 63 | 10.131.224.0/20 | 10.131.224.1 – 10.131.239.254 | 10.131.239.255 |
| 64 | 10.131.240.0/20 | 10.131.240.1 – 10.131.255.254 | 10.131.255.255 |
| 65 | 10.132.0.0/20 | 10.132.0.1 – 10.132.15.254 | 10.132.15.255 |
| 66 | 10.132.16.0/20 | 10.132.16.1 – 10.132.31.254 | 10.132.31.255 |
| 67 | 10.132.32.0/20 | 10.132.32.1 – 10.132.47.254 | 10.132.47.255 |
| 68 | 10.132.48.0/20 | 10.132.48.1 – 10.132.63.254 | 10.132.63.255 |
| 69 | 10.132.64.0/20 | 10.132.64.1 – 10.132.79.254 | 10.132.79.255 |
| 70 | 10.132.80.0/20 | 10.132.80.1 – 10.132.95.254 | 10.132.95.255 |
| 71 | 10.132.96.0/20 | 10.132.96.1 – 10.132.111.254 | 10.132.111.255 |
| 72 | 10.132.112.0/20 | 10.132.112.1 – 10.132.127.254 | 10.132.127.255 |
| 73 | 10.132.128.0/20 | 10.132.128.1 – 10.132.143.254 | 10.132.143.255 |
| 74 | 10.132.144.0/20 | 10.132.144.1 – 10.132.159.254 | 10.132.159.255 |
| 75 | 10.132.160.0/20 | 10.132.160.1 – 10.132.175.254 | 10.132.175.255 |
| 76 | 10.132.176.0/20 | 10.132.176.1 – 10.132.191.254 | 10.132.191.255 |
| 77 | 10.132.192.0/20 | 10.132.192.1 – 10.132.207.254 | 10.132.207.255 |
| 78 | 10.132.208.0/20 | 10.132.208.1 – 10.132.223.254 | 10.132.223.255 |
| 79 | 10.132.224.0/20 | 10.132.224.1 – 10.132.239.254 | 10.132.239.255 |
| 80 | 10.132.240.0/20 | 10.132.240.1 – 10.132.255.254 | 10.132.255.255 |
| 81 | 10.133.0.0/20 | 10.133.0.1 – 10.133.15.254 | 10.133.15.255 |
| 82 | 10.133.16.0/20 | 10.133.16.1 – 10.133.31.254 | 10.133.31.255 |
| 83 | 10.133.32.0/20 | 10.133.32.1 – 10.133.47.254 | 10.133.47.255 |
| 84 | 10.133.48.0/20 | 10.133.48.1 – 10.133.63.254 | 10.133.63.255 |
| 85 | 10.133.64.0/20 | 10.133.64.1 – 10.133.79.254 | 10.133.79.255 |
| 86 | 10.133.80.0/20 | 10.133.80.1 – 10.133.95.254 | 10.133.95.255 |
| 87 | 10.133.96.0/20 | 10.133.96.1 – 10.133.111.254 | 10.133.111.255 |
| 88 | 10.133.112.0/20 | 10.133.112.1 – 10.133.127.254 | 10.133.127.255 |
| 89 | 10.133.128.0/20 | 10.133.128.1 – 10.133.143.254 | 10.133.143.255 |
| 90 | 10.133.144.0/20 | 10.133.144.1 – 10.133.159.254 | 10.133.159.255 |
| 91 | 10.133.160.0/20 | 10.133.160.1 – 10.133.175.254 | 10.133.175.255 |
| 92 | 10.133.176.0/20 | 10.133.176.1 – 10.133.191.254 | 10.133.191.255 |
| 93 | 10.133.192.0/20 | 10.133.192.1 – 10.133.207.254 | 10.133.207.255 |
| 94 | 10.133.208.0/20 | 10.133.208.1 – 10.133.223.254 | 10.133.223.255 |
| 95 | 10.133.224.0/20 | 10.133.224.1 – 10.133.239.254 | 10.133.239.255 |
| 96 | 10.133.240.0/20 | 10.133.240.1 – 10.133.255.254 | 10.133.255.255 |
| 97 | 10.134.0.0/20 | 10.134.0.1 – 10.134.15.254 | 10.134.15.255 |
| 98 | 10.134.16.0/20 | 10.134.16.1 – 10.134.31.254 | 10.134.31.255 |
| 99 | 10.134.32.0/20 | 10.134.32.1 – 10.134.47.254 | 10.134.47.255 |
| 100 | 10.134.48.0/20 | 10.134.48.1 – 10.134.63.254 | 10.134.63.255 |
| 101 | 10.134.64.0/20 | 10.134.64.1 – 10.134.79.254 | 10.134.79.255 |
| 102 | 10.134.80.0/20 | 10.134.80.1 – 10.134.95.254 | 10.134.95.255 |
| 103 | 10.134.96.0/20 | 10.134.96.1 – 10.134.111.254 | 10.134.111.255 |
| 104 | 10.134.112.0/20 | 10.134.112.1 – 10.134.127.254 | 10.134.127.255 |
| 105 | 10.134.128.0/20 | 10.134.128.1 – 10.134.143.254 | 10.134.143.255 |
| 106 | 10.134.144.0/20 | 10.134.144.1 – 10.134.159.254 | 10.134.159.255 |
| 107 | 10.134.160.0/20 | 10.134.160.1 – 10.134.175.254 | 10.134.175.255 |
| 108 | 10.134.176.0/20 | 10.134.176.1 – 10.134.191.254 | 10.134.191.255 |
| 109 | 10.134.192.0/20 | 10.134.192.1 – 10.134.207.254 | 10.134.207.255 |
| 110 | 10.134.208.0/20 | 10.134.208.1 – 10.134.223.254 | 10.134.223.255 |
| 111 | 10.134.224.0/20 | 10.134.224.1 – 10.134.239.254 | 10.134.239.255 |
| 112 | 10.134.240.0/20 | 10.134.240.1 – 10.134.255.254 | 10.134.255.255 |
| 113 | 10.135.0.0/20 | 10.135.0.1 – 10.135.15.254 | 10.135.15.255 |
| 114 | 10.135.16.0/20 | 10.135.16.1 – 10.135.31.254 | 10.135.31.255 |
| 115 | 10.135.32.0/20 | 10.135.32.1 – 10.135.47.254 | 10.135.47.255 |
| 116 | 10.135.48.0/20 | 10.135.48.1 – 10.135.63.254 | 10.135.63.255 |
| 117 | 10.135.64.0/20 | 10.135.64.1 – 10.135.79.254 | 10.135.79.255 |
| 118 | 10.135.80.0/20 | 10.135.80.1 – 10.135.95.254 | 10.135.95.255 |
| 119 | 10.135.96.0/20 | 10.135.96.1 – 10.135.111.254 | 10.135.111.255 |
| 120 | 10.135.112.0/20 | 10.135.112.1 – 10.135.127.254 | 10.135.127.255 |
| 121 | 10.135.128.0/20 | 10.135.128.1 – 10.135.143.254 | 10.135.143.255 |
| 122 | 10.135.144.0/20 | 10.135.144.1 – 10.135.159.254 | 10.135.159.255 |
| 123 | 10.135.160.0/20 | 10.135.160.1 – 10.135.175.254 | 10.135.175.255 |
| 124 | 10.135.176.0/20 | 10.135.176.1 – 10.135.191.254 | 10.135.191.255 |
| 125 | 10.135.192.0/20 | 10.135.192.1 – 10.135.207.254 | 10.135.207.255 |
| 126 | 10.135.208.0/20 | 10.135.208.1 – 10.135.223.254 | 10.135.223.255 |
| 127 | 10.135.224.0/20 | 10.135.224.1 – 10.135.239.254 | 10.135.239.255 |
| 128 | 10.135.240.0/20 | 10.135.240.1 – 10.135.255.254 | 10.135.255.255 |
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.