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)10.166.32.0/19
network10.166.32.0/19
broadcast10.166.63.255
first host10.166.32.1
last host10.166.63.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.166.32.0/19
address00001010.10100110.00100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.10100110.00100000.00000000
broadcast00001010.10100110.00111111.11111111
green = network part, grey = host part
hex0x0aa62000
decimal178659328
reverse dns0.32.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:2000
/19 split into /26 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.166.32.0/26 | 10.166.32.1 – 10.166.32.62 | 10.166.32.63 |
| 2 | 10.166.32.64/26 | 10.166.32.65 – 10.166.32.126 | 10.166.32.127 |
| 3 | 10.166.32.128/26 | 10.166.32.129 – 10.166.32.190 | 10.166.32.191 |
| 4 | 10.166.32.192/26 | 10.166.32.193 – 10.166.32.254 | 10.166.32.255 |
| 5 | 10.166.33.0/26 | 10.166.33.1 – 10.166.33.62 | 10.166.33.63 |
| 6 | 10.166.33.64/26 | 10.166.33.65 – 10.166.33.126 | 10.166.33.127 |
| 7 | 10.166.33.128/26 | 10.166.33.129 – 10.166.33.190 | 10.166.33.191 |
| 8 | 10.166.33.192/26 | 10.166.33.193 – 10.166.33.254 | 10.166.33.255 |
| 9 | 10.166.34.0/26 | 10.166.34.1 – 10.166.34.62 | 10.166.34.63 |
| 10 | 10.166.34.64/26 | 10.166.34.65 – 10.166.34.126 | 10.166.34.127 |
| 11 | 10.166.34.128/26 | 10.166.34.129 – 10.166.34.190 | 10.166.34.191 |
| 12 | 10.166.34.192/26 | 10.166.34.193 – 10.166.34.254 | 10.166.34.255 |
| 13 | 10.166.35.0/26 | 10.166.35.1 – 10.166.35.62 | 10.166.35.63 |
| 14 | 10.166.35.64/26 | 10.166.35.65 – 10.166.35.126 | 10.166.35.127 |
| 15 | 10.166.35.128/26 | 10.166.35.129 – 10.166.35.190 | 10.166.35.191 |
| 16 | 10.166.35.192/26 | 10.166.35.193 – 10.166.35.254 | 10.166.35.255 |
| 17 | 10.166.36.0/26 | 10.166.36.1 – 10.166.36.62 | 10.166.36.63 |
| 18 | 10.166.36.64/26 | 10.166.36.65 – 10.166.36.126 | 10.166.36.127 |
| 19 | 10.166.36.128/26 | 10.166.36.129 – 10.166.36.190 | 10.166.36.191 |
| 20 | 10.166.36.192/26 | 10.166.36.193 – 10.166.36.254 | 10.166.36.255 |
| 21 | 10.166.37.0/26 | 10.166.37.1 – 10.166.37.62 | 10.166.37.63 |
| 22 | 10.166.37.64/26 | 10.166.37.65 – 10.166.37.126 | 10.166.37.127 |
| 23 | 10.166.37.128/26 | 10.166.37.129 – 10.166.37.190 | 10.166.37.191 |
| 24 | 10.166.37.192/26 | 10.166.37.193 – 10.166.37.254 | 10.166.37.255 |
| 25 | 10.166.38.0/26 | 10.166.38.1 – 10.166.38.62 | 10.166.38.63 |
| 26 | 10.166.38.64/26 | 10.166.38.65 – 10.166.38.126 | 10.166.38.127 |
| 27 | 10.166.38.128/26 | 10.166.38.129 – 10.166.38.190 | 10.166.38.191 |
| 28 | 10.166.38.192/26 | 10.166.38.193 – 10.166.38.254 | 10.166.38.255 |
| 29 | 10.166.39.0/26 | 10.166.39.1 – 10.166.39.62 | 10.166.39.63 |
| 30 | 10.166.39.64/26 | 10.166.39.65 – 10.166.39.126 | 10.166.39.127 |
| 31 | 10.166.39.128/26 | 10.166.39.129 – 10.166.39.190 | 10.166.39.191 |
| 32 | 10.166.39.192/26 | 10.166.39.193 – 10.166.39.254 | 10.166.39.255 |
| 33 | 10.166.40.0/26 | 10.166.40.1 – 10.166.40.62 | 10.166.40.63 |
| 34 | 10.166.40.64/26 | 10.166.40.65 – 10.166.40.126 | 10.166.40.127 |
| 35 | 10.166.40.128/26 | 10.166.40.129 – 10.166.40.190 | 10.166.40.191 |
| 36 | 10.166.40.192/26 | 10.166.40.193 – 10.166.40.254 | 10.166.40.255 |
| 37 | 10.166.41.0/26 | 10.166.41.1 – 10.166.41.62 | 10.166.41.63 |
| 38 | 10.166.41.64/26 | 10.166.41.65 – 10.166.41.126 | 10.166.41.127 |
| 39 | 10.166.41.128/26 | 10.166.41.129 – 10.166.41.190 | 10.166.41.191 |
| 40 | 10.166.41.192/26 | 10.166.41.193 – 10.166.41.254 | 10.166.41.255 |
| 41 | 10.166.42.0/26 | 10.166.42.1 – 10.166.42.62 | 10.166.42.63 |
| 42 | 10.166.42.64/26 | 10.166.42.65 – 10.166.42.126 | 10.166.42.127 |
| 43 | 10.166.42.128/26 | 10.166.42.129 – 10.166.42.190 | 10.166.42.191 |
| 44 | 10.166.42.192/26 | 10.166.42.193 – 10.166.42.254 | 10.166.42.255 |
| 45 | 10.166.43.0/26 | 10.166.43.1 – 10.166.43.62 | 10.166.43.63 |
| 46 | 10.166.43.64/26 | 10.166.43.65 – 10.166.43.126 | 10.166.43.127 |
| 47 | 10.166.43.128/26 | 10.166.43.129 – 10.166.43.190 | 10.166.43.191 |
| 48 | 10.166.43.192/26 | 10.166.43.193 – 10.166.43.254 | 10.166.43.255 |
| 49 | 10.166.44.0/26 | 10.166.44.1 – 10.166.44.62 | 10.166.44.63 |
| 50 | 10.166.44.64/26 | 10.166.44.65 – 10.166.44.126 | 10.166.44.127 |
| 51 | 10.166.44.128/26 | 10.166.44.129 – 10.166.44.190 | 10.166.44.191 |
| 52 | 10.166.44.192/26 | 10.166.44.193 – 10.166.44.254 | 10.166.44.255 |
| 53 | 10.166.45.0/26 | 10.166.45.1 – 10.166.45.62 | 10.166.45.63 |
| 54 | 10.166.45.64/26 | 10.166.45.65 – 10.166.45.126 | 10.166.45.127 |
| 55 | 10.166.45.128/26 | 10.166.45.129 – 10.166.45.190 | 10.166.45.191 |
| 56 | 10.166.45.192/26 | 10.166.45.193 – 10.166.45.254 | 10.166.45.255 |
| 57 | 10.166.46.0/26 | 10.166.46.1 – 10.166.46.62 | 10.166.46.63 |
| 58 | 10.166.46.64/26 | 10.166.46.65 – 10.166.46.126 | 10.166.46.127 |
| 59 | 10.166.46.128/26 | 10.166.46.129 – 10.166.46.190 | 10.166.46.191 |
| 60 | 10.166.46.192/26 | 10.166.46.193 – 10.166.46.254 | 10.166.46.255 |
| 61 | 10.166.47.0/26 | 10.166.47.1 – 10.166.47.62 | 10.166.47.63 |
| 62 | 10.166.47.64/26 | 10.166.47.65 – 10.166.47.126 | 10.166.47.127 |
| 63 | 10.166.47.128/26 | 10.166.47.129 – 10.166.47.190 | 10.166.47.191 |
| 64 | 10.166.47.192/26 | 10.166.47.193 – 10.166.47.254 | 10.166.47.255 |
| 65 | 10.166.48.0/26 | 10.166.48.1 – 10.166.48.62 | 10.166.48.63 |
| 66 | 10.166.48.64/26 | 10.166.48.65 – 10.166.48.126 | 10.166.48.127 |
| 67 | 10.166.48.128/26 | 10.166.48.129 – 10.166.48.190 | 10.166.48.191 |
| 68 | 10.166.48.192/26 | 10.166.48.193 – 10.166.48.254 | 10.166.48.255 |
| 69 | 10.166.49.0/26 | 10.166.49.1 – 10.166.49.62 | 10.166.49.63 |
| 70 | 10.166.49.64/26 | 10.166.49.65 – 10.166.49.126 | 10.166.49.127 |
| 71 | 10.166.49.128/26 | 10.166.49.129 – 10.166.49.190 | 10.166.49.191 |
| 72 | 10.166.49.192/26 | 10.166.49.193 – 10.166.49.254 | 10.166.49.255 |
| 73 | 10.166.50.0/26 | 10.166.50.1 – 10.166.50.62 | 10.166.50.63 |
| 74 | 10.166.50.64/26 | 10.166.50.65 – 10.166.50.126 | 10.166.50.127 |
| 75 | 10.166.50.128/26 | 10.166.50.129 – 10.166.50.190 | 10.166.50.191 |
| 76 | 10.166.50.192/26 | 10.166.50.193 – 10.166.50.254 | 10.166.50.255 |
| 77 | 10.166.51.0/26 | 10.166.51.1 – 10.166.51.62 | 10.166.51.63 |
| 78 | 10.166.51.64/26 | 10.166.51.65 – 10.166.51.126 | 10.166.51.127 |
| 79 | 10.166.51.128/26 | 10.166.51.129 – 10.166.51.190 | 10.166.51.191 |
| 80 | 10.166.51.192/26 | 10.166.51.193 – 10.166.51.254 | 10.166.51.255 |
| 81 | 10.166.52.0/26 | 10.166.52.1 – 10.166.52.62 | 10.166.52.63 |
| 82 | 10.166.52.64/26 | 10.166.52.65 – 10.166.52.126 | 10.166.52.127 |
| 83 | 10.166.52.128/26 | 10.166.52.129 – 10.166.52.190 | 10.166.52.191 |
| 84 | 10.166.52.192/26 | 10.166.52.193 – 10.166.52.254 | 10.166.52.255 |
| 85 | 10.166.53.0/26 | 10.166.53.1 – 10.166.53.62 | 10.166.53.63 |
| 86 | 10.166.53.64/26 | 10.166.53.65 – 10.166.53.126 | 10.166.53.127 |
| 87 | 10.166.53.128/26 | 10.166.53.129 – 10.166.53.190 | 10.166.53.191 |
| 88 | 10.166.53.192/26 | 10.166.53.193 – 10.166.53.254 | 10.166.53.255 |
| 89 | 10.166.54.0/26 | 10.166.54.1 – 10.166.54.62 | 10.166.54.63 |
| 90 | 10.166.54.64/26 | 10.166.54.65 – 10.166.54.126 | 10.166.54.127 |
| 91 | 10.166.54.128/26 | 10.166.54.129 – 10.166.54.190 | 10.166.54.191 |
| 92 | 10.166.54.192/26 | 10.166.54.193 – 10.166.54.254 | 10.166.54.255 |
| 93 | 10.166.55.0/26 | 10.166.55.1 – 10.166.55.62 | 10.166.55.63 |
| 94 | 10.166.55.64/26 | 10.166.55.65 – 10.166.55.126 | 10.166.55.127 |
| 95 | 10.166.55.128/26 | 10.166.55.129 – 10.166.55.190 | 10.166.55.191 |
| 96 | 10.166.55.192/26 | 10.166.55.193 – 10.166.55.254 | 10.166.55.255 |
| 97 | 10.166.56.0/26 | 10.166.56.1 – 10.166.56.62 | 10.166.56.63 |
| 98 | 10.166.56.64/26 | 10.166.56.65 – 10.166.56.126 | 10.166.56.127 |
| 99 | 10.166.56.128/26 | 10.166.56.129 – 10.166.56.190 | 10.166.56.191 |
| 100 | 10.166.56.192/26 | 10.166.56.193 – 10.166.56.254 | 10.166.56.255 |
| 101 | 10.166.57.0/26 | 10.166.57.1 – 10.166.57.62 | 10.166.57.63 |
| 102 | 10.166.57.64/26 | 10.166.57.65 – 10.166.57.126 | 10.166.57.127 |
| 103 | 10.166.57.128/26 | 10.166.57.129 – 10.166.57.190 | 10.166.57.191 |
| 104 | 10.166.57.192/26 | 10.166.57.193 – 10.166.57.254 | 10.166.57.255 |
| 105 | 10.166.58.0/26 | 10.166.58.1 – 10.166.58.62 | 10.166.58.63 |
| 106 | 10.166.58.64/26 | 10.166.58.65 – 10.166.58.126 | 10.166.58.127 |
| 107 | 10.166.58.128/26 | 10.166.58.129 – 10.166.58.190 | 10.166.58.191 |
| 108 | 10.166.58.192/26 | 10.166.58.193 – 10.166.58.254 | 10.166.58.255 |
| 109 | 10.166.59.0/26 | 10.166.59.1 – 10.166.59.62 | 10.166.59.63 |
| 110 | 10.166.59.64/26 | 10.166.59.65 – 10.166.59.126 | 10.166.59.127 |
| 111 | 10.166.59.128/26 | 10.166.59.129 – 10.166.59.190 | 10.166.59.191 |
| 112 | 10.166.59.192/26 | 10.166.59.193 – 10.166.59.254 | 10.166.59.255 |
| 113 | 10.166.60.0/26 | 10.166.60.1 – 10.166.60.62 | 10.166.60.63 |
| 114 | 10.166.60.64/26 | 10.166.60.65 – 10.166.60.126 | 10.166.60.127 |
| 115 | 10.166.60.128/26 | 10.166.60.129 – 10.166.60.190 | 10.166.60.191 |
| 116 | 10.166.60.192/26 | 10.166.60.193 – 10.166.60.254 | 10.166.60.255 |
| 117 | 10.166.61.0/26 | 10.166.61.1 – 10.166.61.62 | 10.166.61.63 |
| 118 | 10.166.61.64/26 | 10.166.61.65 – 10.166.61.126 | 10.166.61.127 |
| 119 | 10.166.61.128/26 | 10.166.61.129 – 10.166.61.190 | 10.166.61.191 |
| 120 | 10.166.61.192/26 | 10.166.61.193 – 10.166.61.254 | 10.166.61.255 |
| 121 | 10.166.62.0/26 | 10.166.62.1 – 10.166.62.62 | 10.166.62.63 |
| 122 | 10.166.62.64/26 | 10.166.62.65 – 10.166.62.126 | 10.166.62.127 |
| 123 | 10.166.62.128/26 | 10.166.62.129 – 10.166.62.190 | 10.166.62.191 |
| 124 | 10.166.62.192/26 | 10.166.62.193 – 10.166.62.254 | 10.166.62.255 |
| 125 | 10.166.63.0/26 | 10.166.63.1 – 10.166.63.62 | 10.166.63.63 |
| 126 | 10.166.63.64/26 | 10.166.63.65 – 10.166.63.126 | 10.166.63.127 |
| 127 | 10.166.63.128/26 | 10.166.63.129 – 10.166.63.190 | 10.166.63.191 |
| 128 | 10.166.63.192/26 | 10.166.63.193 – 10.166.63.254 | 10.166.63.255 |
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 /19 |
|---|---|---|---|---|
| /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 | - |
| /16 | 255.255.0.0 | 65,536 | 65,534 | - |
| /17 | 255.255.128.0 | 32,768 | 32,766 | - |
| /18 | 255.255.192.0 | 16,384 | 16,382 | - |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 1 |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 2 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 4 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 8 split → |
| /23 | 255.255.254.0 | 512 | 510 | 16 split → |
| /24 | 255.255.255.0 | 256 | 254 | 32 split → |
| /25 | 255.255.255.128 | 128 | 126 | 64 split → |
| /26 | 255.255.255.192 | 64 | 62 | 128 split → |
| /27 | 255.255.255.224 | 32 | 30 | 256 split → |
| /28 | 255.255.255.240 | 16 | 14 | 512 split → |
| /29 | 255.255.255.248 | 8 | 6 | 1,024 split → |
| /30 | 255.255.255.252 | 4 | 2 | 2,048 split → |
| /31 | 255.255.255.254 | 2 | 2 | 4,096 split → |
| /32 | 255.255.255.255 | 1 | 1 | 8,192 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.