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)10.23.0.0/18
network10.23.0.0/18
broadcast10.23.63.255
first host10.23.0.1
last host10.23.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.23.0.0/18
address00001010.00010111.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010111.00000000.00000000
broadcast00001010.00010111.00111111.11111111
green = network part, grey = host part
hex0x0a170000
decimal169279488
reverse dns0.0.23.10.in-addr.arpa
ipv4-mapped::ffff:a17:0
/18 split into /25 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.23.0.0/25 | 10.23.0.1 – 10.23.0.126 | 10.23.0.127 |
| 2 | 10.23.0.128/25 | 10.23.0.129 – 10.23.0.254 | 10.23.0.255 |
| 3 | 10.23.1.0/25 | 10.23.1.1 – 10.23.1.126 | 10.23.1.127 |
| 4 | 10.23.1.128/25 | 10.23.1.129 – 10.23.1.254 | 10.23.1.255 |
| 5 | 10.23.2.0/25 | 10.23.2.1 – 10.23.2.126 | 10.23.2.127 |
| 6 | 10.23.2.128/25 | 10.23.2.129 – 10.23.2.254 | 10.23.2.255 |
| 7 | 10.23.3.0/25 | 10.23.3.1 – 10.23.3.126 | 10.23.3.127 |
| 8 | 10.23.3.128/25 | 10.23.3.129 – 10.23.3.254 | 10.23.3.255 |
| 9 | 10.23.4.0/25 | 10.23.4.1 – 10.23.4.126 | 10.23.4.127 |
| 10 | 10.23.4.128/25 | 10.23.4.129 – 10.23.4.254 | 10.23.4.255 |
| 11 | 10.23.5.0/25 | 10.23.5.1 – 10.23.5.126 | 10.23.5.127 |
| 12 | 10.23.5.128/25 | 10.23.5.129 – 10.23.5.254 | 10.23.5.255 |
| 13 | 10.23.6.0/25 | 10.23.6.1 – 10.23.6.126 | 10.23.6.127 |
| 14 | 10.23.6.128/25 | 10.23.6.129 – 10.23.6.254 | 10.23.6.255 |
| 15 | 10.23.7.0/25 | 10.23.7.1 – 10.23.7.126 | 10.23.7.127 |
| 16 | 10.23.7.128/25 | 10.23.7.129 – 10.23.7.254 | 10.23.7.255 |
| 17 | 10.23.8.0/25 | 10.23.8.1 – 10.23.8.126 | 10.23.8.127 |
| 18 | 10.23.8.128/25 | 10.23.8.129 – 10.23.8.254 | 10.23.8.255 |
| 19 | 10.23.9.0/25 | 10.23.9.1 – 10.23.9.126 | 10.23.9.127 |
| 20 | 10.23.9.128/25 | 10.23.9.129 – 10.23.9.254 | 10.23.9.255 |
| 21 | 10.23.10.0/25 | 10.23.10.1 – 10.23.10.126 | 10.23.10.127 |
| 22 | 10.23.10.128/25 | 10.23.10.129 – 10.23.10.254 | 10.23.10.255 |
| 23 | 10.23.11.0/25 | 10.23.11.1 – 10.23.11.126 | 10.23.11.127 |
| 24 | 10.23.11.128/25 | 10.23.11.129 – 10.23.11.254 | 10.23.11.255 |
| 25 | 10.23.12.0/25 | 10.23.12.1 – 10.23.12.126 | 10.23.12.127 |
| 26 | 10.23.12.128/25 | 10.23.12.129 – 10.23.12.254 | 10.23.12.255 |
| 27 | 10.23.13.0/25 | 10.23.13.1 – 10.23.13.126 | 10.23.13.127 |
| 28 | 10.23.13.128/25 | 10.23.13.129 – 10.23.13.254 | 10.23.13.255 |
| 29 | 10.23.14.0/25 | 10.23.14.1 – 10.23.14.126 | 10.23.14.127 |
| 30 | 10.23.14.128/25 | 10.23.14.129 – 10.23.14.254 | 10.23.14.255 |
| 31 | 10.23.15.0/25 | 10.23.15.1 – 10.23.15.126 | 10.23.15.127 |
| 32 | 10.23.15.128/25 | 10.23.15.129 – 10.23.15.254 | 10.23.15.255 |
| 33 | 10.23.16.0/25 | 10.23.16.1 – 10.23.16.126 | 10.23.16.127 |
| 34 | 10.23.16.128/25 | 10.23.16.129 – 10.23.16.254 | 10.23.16.255 |
| 35 | 10.23.17.0/25 | 10.23.17.1 – 10.23.17.126 | 10.23.17.127 |
| 36 | 10.23.17.128/25 | 10.23.17.129 – 10.23.17.254 | 10.23.17.255 |
| 37 | 10.23.18.0/25 | 10.23.18.1 – 10.23.18.126 | 10.23.18.127 |
| 38 | 10.23.18.128/25 | 10.23.18.129 – 10.23.18.254 | 10.23.18.255 |
| 39 | 10.23.19.0/25 | 10.23.19.1 – 10.23.19.126 | 10.23.19.127 |
| 40 | 10.23.19.128/25 | 10.23.19.129 – 10.23.19.254 | 10.23.19.255 |
| 41 | 10.23.20.0/25 | 10.23.20.1 – 10.23.20.126 | 10.23.20.127 |
| 42 | 10.23.20.128/25 | 10.23.20.129 – 10.23.20.254 | 10.23.20.255 |
| 43 | 10.23.21.0/25 | 10.23.21.1 – 10.23.21.126 | 10.23.21.127 |
| 44 | 10.23.21.128/25 | 10.23.21.129 – 10.23.21.254 | 10.23.21.255 |
| 45 | 10.23.22.0/25 | 10.23.22.1 – 10.23.22.126 | 10.23.22.127 |
| 46 | 10.23.22.128/25 | 10.23.22.129 – 10.23.22.254 | 10.23.22.255 |
| 47 | 10.23.23.0/25 | 10.23.23.1 – 10.23.23.126 | 10.23.23.127 |
| 48 | 10.23.23.128/25 | 10.23.23.129 – 10.23.23.254 | 10.23.23.255 |
| 49 | 10.23.24.0/25 | 10.23.24.1 – 10.23.24.126 | 10.23.24.127 |
| 50 | 10.23.24.128/25 | 10.23.24.129 – 10.23.24.254 | 10.23.24.255 |
| 51 | 10.23.25.0/25 | 10.23.25.1 – 10.23.25.126 | 10.23.25.127 |
| 52 | 10.23.25.128/25 | 10.23.25.129 – 10.23.25.254 | 10.23.25.255 |
| 53 | 10.23.26.0/25 | 10.23.26.1 – 10.23.26.126 | 10.23.26.127 |
| 54 | 10.23.26.128/25 | 10.23.26.129 – 10.23.26.254 | 10.23.26.255 |
| 55 | 10.23.27.0/25 | 10.23.27.1 – 10.23.27.126 | 10.23.27.127 |
| 56 | 10.23.27.128/25 | 10.23.27.129 – 10.23.27.254 | 10.23.27.255 |
| 57 | 10.23.28.0/25 | 10.23.28.1 – 10.23.28.126 | 10.23.28.127 |
| 58 | 10.23.28.128/25 | 10.23.28.129 – 10.23.28.254 | 10.23.28.255 |
| 59 | 10.23.29.0/25 | 10.23.29.1 – 10.23.29.126 | 10.23.29.127 |
| 60 | 10.23.29.128/25 | 10.23.29.129 – 10.23.29.254 | 10.23.29.255 |
| 61 | 10.23.30.0/25 | 10.23.30.1 – 10.23.30.126 | 10.23.30.127 |
| 62 | 10.23.30.128/25 | 10.23.30.129 – 10.23.30.254 | 10.23.30.255 |
| 63 | 10.23.31.0/25 | 10.23.31.1 – 10.23.31.126 | 10.23.31.127 |
| 64 | 10.23.31.128/25 | 10.23.31.129 – 10.23.31.254 | 10.23.31.255 |
| 65 | 10.23.32.0/25 | 10.23.32.1 – 10.23.32.126 | 10.23.32.127 |
| 66 | 10.23.32.128/25 | 10.23.32.129 – 10.23.32.254 | 10.23.32.255 |
| 67 | 10.23.33.0/25 | 10.23.33.1 – 10.23.33.126 | 10.23.33.127 |
| 68 | 10.23.33.128/25 | 10.23.33.129 – 10.23.33.254 | 10.23.33.255 |
| 69 | 10.23.34.0/25 | 10.23.34.1 – 10.23.34.126 | 10.23.34.127 |
| 70 | 10.23.34.128/25 | 10.23.34.129 – 10.23.34.254 | 10.23.34.255 |
| 71 | 10.23.35.0/25 | 10.23.35.1 – 10.23.35.126 | 10.23.35.127 |
| 72 | 10.23.35.128/25 | 10.23.35.129 – 10.23.35.254 | 10.23.35.255 |
| 73 | 10.23.36.0/25 | 10.23.36.1 – 10.23.36.126 | 10.23.36.127 |
| 74 | 10.23.36.128/25 | 10.23.36.129 – 10.23.36.254 | 10.23.36.255 |
| 75 | 10.23.37.0/25 | 10.23.37.1 – 10.23.37.126 | 10.23.37.127 |
| 76 | 10.23.37.128/25 | 10.23.37.129 – 10.23.37.254 | 10.23.37.255 |
| 77 | 10.23.38.0/25 | 10.23.38.1 – 10.23.38.126 | 10.23.38.127 |
| 78 | 10.23.38.128/25 | 10.23.38.129 – 10.23.38.254 | 10.23.38.255 |
| 79 | 10.23.39.0/25 | 10.23.39.1 – 10.23.39.126 | 10.23.39.127 |
| 80 | 10.23.39.128/25 | 10.23.39.129 – 10.23.39.254 | 10.23.39.255 |
| 81 | 10.23.40.0/25 | 10.23.40.1 – 10.23.40.126 | 10.23.40.127 |
| 82 | 10.23.40.128/25 | 10.23.40.129 – 10.23.40.254 | 10.23.40.255 |
| 83 | 10.23.41.0/25 | 10.23.41.1 – 10.23.41.126 | 10.23.41.127 |
| 84 | 10.23.41.128/25 | 10.23.41.129 – 10.23.41.254 | 10.23.41.255 |
| 85 | 10.23.42.0/25 | 10.23.42.1 – 10.23.42.126 | 10.23.42.127 |
| 86 | 10.23.42.128/25 | 10.23.42.129 – 10.23.42.254 | 10.23.42.255 |
| 87 | 10.23.43.0/25 | 10.23.43.1 – 10.23.43.126 | 10.23.43.127 |
| 88 | 10.23.43.128/25 | 10.23.43.129 – 10.23.43.254 | 10.23.43.255 |
| 89 | 10.23.44.0/25 | 10.23.44.1 – 10.23.44.126 | 10.23.44.127 |
| 90 | 10.23.44.128/25 | 10.23.44.129 – 10.23.44.254 | 10.23.44.255 |
| 91 | 10.23.45.0/25 | 10.23.45.1 – 10.23.45.126 | 10.23.45.127 |
| 92 | 10.23.45.128/25 | 10.23.45.129 – 10.23.45.254 | 10.23.45.255 |
| 93 | 10.23.46.0/25 | 10.23.46.1 – 10.23.46.126 | 10.23.46.127 |
| 94 | 10.23.46.128/25 | 10.23.46.129 – 10.23.46.254 | 10.23.46.255 |
| 95 | 10.23.47.0/25 | 10.23.47.1 – 10.23.47.126 | 10.23.47.127 |
| 96 | 10.23.47.128/25 | 10.23.47.129 – 10.23.47.254 | 10.23.47.255 |
| 97 | 10.23.48.0/25 | 10.23.48.1 – 10.23.48.126 | 10.23.48.127 |
| 98 | 10.23.48.128/25 | 10.23.48.129 – 10.23.48.254 | 10.23.48.255 |
| 99 | 10.23.49.0/25 | 10.23.49.1 – 10.23.49.126 | 10.23.49.127 |
| 100 | 10.23.49.128/25 | 10.23.49.129 – 10.23.49.254 | 10.23.49.255 |
| 101 | 10.23.50.0/25 | 10.23.50.1 – 10.23.50.126 | 10.23.50.127 |
| 102 | 10.23.50.128/25 | 10.23.50.129 – 10.23.50.254 | 10.23.50.255 |
| 103 | 10.23.51.0/25 | 10.23.51.1 – 10.23.51.126 | 10.23.51.127 |
| 104 | 10.23.51.128/25 | 10.23.51.129 – 10.23.51.254 | 10.23.51.255 |
| 105 | 10.23.52.0/25 | 10.23.52.1 – 10.23.52.126 | 10.23.52.127 |
| 106 | 10.23.52.128/25 | 10.23.52.129 – 10.23.52.254 | 10.23.52.255 |
| 107 | 10.23.53.0/25 | 10.23.53.1 – 10.23.53.126 | 10.23.53.127 |
| 108 | 10.23.53.128/25 | 10.23.53.129 – 10.23.53.254 | 10.23.53.255 |
| 109 | 10.23.54.0/25 | 10.23.54.1 – 10.23.54.126 | 10.23.54.127 |
| 110 | 10.23.54.128/25 | 10.23.54.129 – 10.23.54.254 | 10.23.54.255 |
| 111 | 10.23.55.0/25 | 10.23.55.1 – 10.23.55.126 | 10.23.55.127 |
| 112 | 10.23.55.128/25 | 10.23.55.129 – 10.23.55.254 | 10.23.55.255 |
| 113 | 10.23.56.0/25 | 10.23.56.1 – 10.23.56.126 | 10.23.56.127 |
| 114 | 10.23.56.128/25 | 10.23.56.129 – 10.23.56.254 | 10.23.56.255 |
| 115 | 10.23.57.0/25 | 10.23.57.1 – 10.23.57.126 | 10.23.57.127 |
| 116 | 10.23.57.128/25 | 10.23.57.129 – 10.23.57.254 | 10.23.57.255 |
| 117 | 10.23.58.0/25 | 10.23.58.1 – 10.23.58.126 | 10.23.58.127 |
| 118 | 10.23.58.128/25 | 10.23.58.129 – 10.23.58.254 | 10.23.58.255 |
| 119 | 10.23.59.0/25 | 10.23.59.1 – 10.23.59.126 | 10.23.59.127 |
| 120 | 10.23.59.128/25 | 10.23.59.129 – 10.23.59.254 | 10.23.59.255 |
| 121 | 10.23.60.0/25 | 10.23.60.1 – 10.23.60.126 | 10.23.60.127 |
| 122 | 10.23.60.128/25 | 10.23.60.129 – 10.23.60.254 | 10.23.60.255 |
| 123 | 10.23.61.0/25 | 10.23.61.1 – 10.23.61.126 | 10.23.61.127 |
| 124 | 10.23.61.128/25 | 10.23.61.129 – 10.23.61.254 | 10.23.61.255 |
| 125 | 10.23.62.0/25 | 10.23.62.1 – 10.23.62.126 | 10.23.62.127 |
| 126 | 10.23.62.128/25 | 10.23.62.129 – 10.23.62.254 | 10.23.62.255 |
| 127 | 10.23.63.0/25 | 10.23.63.1 – 10.23.63.126 | 10.23.63.127 |
| 128 | 10.23.63.128/25 | 10.23.63.129 – 10.23.63.254 | 10.23.63.255 |
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 /18 |
|---|---|---|---|---|
| /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 | 1 |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 2 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 4 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 8 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 16 split → |
| /23 | 255.255.254.0 | 512 | 510 | 32 split → |
| /24 | 255.255.255.0 | 256 | 254 | 64 split → |
| /25 | 255.255.255.128 | 128 | 126 | 128 split → |
| /26 | 255.255.255.192 | 64 | 62 | 256 split → |
| /27 | 255.255.255.224 | 32 | 30 | 512 split → |
| /28 | 255.255.255.240 | 16 | 14 | 1,024 split → |
| /29 | 255.255.255.248 | 8 | 6 | 2,048 split → |
| /30 | 255.255.255.252 | 4 | 2 | 4,096 split → |
| /31 | 255.255.255.254 | 2 | 2 | 8,192 split → |
| /32 | 255.255.255.255 | 1 | 1 | 16,384 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.