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)10.239.32.0/20
network10.239.32.0/20
broadcast10.239.47.255
first host10.239.32.1
last host10.239.47.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.239.32.0/20
address00001010.11101111.00100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.11101111.00100000.00000000
broadcast00001010.11101111.00101111.11111111
green = network part, grey = host part
hex0x0aef2000
decimal183443456
reverse dns0.32.239.10.in-addr.arpa
ipv4-mapped::ffff:aef:2000
/20 split into /27 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.239.32.0/27 | 10.239.32.1 – 10.239.32.30 | 10.239.32.31 |
| 2 | 10.239.32.32/27 | 10.239.32.33 – 10.239.32.62 | 10.239.32.63 |
| 3 | 10.239.32.64/27 | 10.239.32.65 – 10.239.32.94 | 10.239.32.95 |
| 4 | 10.239.32.96/27 | 10.239.32.97 – 10.239.32.126 | 10.239.32.127 |
| 5 | 10.239.32.128/27 | 10.239.32.129 – 10.239.32.158 | 10.239.32.159 |
| 6 | 10.239.32.160/27 | 10.239.32.161 – 10.239.32.190 | 10.239.32.191 |
| 7 | 10.239.32.192/27 | 10.239.32.193 – 10.239.32.222 | 10.239.32.223 |
| 8 | 10.239.32.224/27 | 10.239.32.225 – 10.239.32.254 | 10.239.32.255 |
| 9 | 10.239.33.0/27 | 10.239.33.1 – 10.239.33.30 | 10.239.33.31 |
| 10 | 10.239.33.32/27 | 10.239.33.33 – 10.239.33.62 | 10.239.33.63 |
| 11 | 10.239.33.64/27 | 10.239.33.65 – 10.239.33.94 | 10.239.33.95 |
| 12 | 10.239.33.96/27 | 10.239.33.97 – 10.239.33.126 | 10.239.33.127 |
| 13 | 10.239.33.128/27 | 10.239.33.129 – 10.239.33.158 | 10.239.33.159 |
| 14 | 10.239.33.160/27 | 10.239.33.161 – 10.239.33.190 | 10.239.33.191 |
| 15 | 10.239.33.192/27 | 10.239.33.193 – 10.239.33.222 | 10.239.33.223 |
| 16 | 10.239.33.224/27 | 10.239.33.225 – 10.239.33.254 | 10.239.33.255 |
| 17 | 10.239.34.0/27 | 10.239.34.1 – 10.239.34.30 | 10.239.34.31 |
| 18 | 10.239.34.32/27 | 10.239.34.33 – 10.239.34.62 | 10.239.34.63 |
| 19 | 10.239.34.64/27 | 10.239.34.65 – 10.239.34.94 | 10.239.34.95 |
| 20 | 10.239.34.96/27 | 10.239.34.97 – 10.239.34.126 | 10.239.34.127 |
| 21 | 10.239.34.128/27 | 10.239.34.129 – 10.239.34.158 | 10.239.34.159 |
| 22 | 10.239.34.160/27 | 10.239.34.161 – 10.239.34.190 | 10.239.34.191 |
| 23 | 10.239.34.192/27 | 10.239.34.193 – 10.239.34.222 | 10.239.34.223 |
| 24 | 10.239.34.224/27 | 10.239.34.225 – 10.239.34.254 | 10.239.34.255 |
| 25 | 10.239.35.0/27 | 10.239.35.1 – 10.239.35.30 | 10.239.35.31 |
| 26 | 10.239.35.32/27 | 10.239.35.33 – 10.239.35.62 | 10.239.35.63 |
| 27 | 10.239.35.64/27 | 10.239.35.65 – 10.239.35.94 | 10.239.35.95 |
| 28 | 10.239.35.96/27 | 10.239.35.97 – 10.239.35.126 | 10.239.35.127 |
| 29 | 10.239.35.128/27 | 10.239.35.129 – 10.239.35.158 | 10.239.35.159 |
| 30 | 10.239.35.160/27 | 10.239.35.161 – 10.239.35.190 | 10.239.35.191 |
| 31 | 10.239.35.192/27 | 10.239.35.193 – 10.239.35.222 | 10.239.35.223 |
| 32 | 10.239.35.224/27 | 10.239.35.225 – 10.239.35.254 | 10.239.35.255 |
| 33 | 10.239.36.0/27 | 10.239.36.1 – 10.239.36.30 | 10.239.36.31 |
| 34 | 10.239.36.32/27 | 10.239.36.33 – 10.239.36.62 | 10.239.36.63 |
| 35 | 10.239.36.64/27 | 10.239.36.65 – 10.239.36.94 | 10.239.36.95 |
| 36 | 10.239.36.96/27 | 10.239.36.97 – 10.239.36.126 | 10.239.36.127 |
| 37 | 10.239.36.128/27 | 10.239.36.129 – 10.239.36.158 | 10.239.36.159 |
| 38 | 10.239.36.160/27 | 10.239.36.161 – 10.239.36.190 | 10.239.36.191 |
| 39 | 10.239.36.192/27 | 10.239.36.193 – 10.239.36.222 | 10.239.36.223 |
| 40 | 10.239.36.224/27 | 10.239.36.225 – 10.239.36.254 | 10.239.36.255 |
| 41 | 10.239.37.0/27 | 10.239.37.1 – 10.239.37.30 | 10.239.37.31 |
| 42 | 10.239.37.32/27 | 10.239.37.33 – 10.239.37.62 | 10.239.37.63 |
| 43 | 10.239.37.64/27 | 10.239.37.65 – 10.239.37.94 | 10.239.37.95 |
| 44 | 10.239.37.96/27 | 10.239.37.97 – 10.239.37.126 | 10.239.37.127 |
| 45 | 10.239.37.128/27 | 10.239.37.129 – 10.239.37.158 | 10.239.37.159 |
| 46 | 10.239.37.160/27 | 10.239.37.161 – 10.239.37.190 | 10.239.37.191 |
| 47 | 10.239.37.192/27 | 10.239.37.193 – 10.239.37.222 | 10.239.37.223 |
| 48 | 10.239.37.224/27 | 10.239.37.225 – 10.239.37.254 | 10.239.37.255 |
| 49 | 10.239.38.0/27 | 10.239.38.1 – 10.239.38.30 | 10.239.38.31 |
| 50 | 10.239.38.32/27 | 10.239.38.33 – 10.239.38.62 | 10.239.38.63 |
| 51 | 10.239.38.64/27 | 10.239.38.65 – 10.239.38.94 | 10.239.38.95 |
| 52 | 10.239.38.96/27 | 10.239.38.97 – 10.239.38.126 | 10.239.38.127 |
| 53 | 10.239.38.128/27 | 10.239.38.129 – 10.239.38.158 | 10.239.38.159 |
| 54 | 10.239.38.160/27 | 10.239.38.161 – 10.239.38.190 | 10.239.38.191 |
| 55 | 10.239.38.192/27 | 10.239.38.193 – 10.239.38.222 | 10.239.38.223 |
| 56 | 10.239.38.224/27 | 10.239.38.225 – 10.239.38.254 | 10.239.38.255 |
| 57 | 10.239.39.0/27 | 10.239.39.1 – 10.239.39.30 | 10.239.39.31 |
| 58 | 10.239.39.32/27 | 10.239.39.33 – 10.239.39.62 | 10.239.39.63 |
| 59 | 10.239.39.64/27 | 10.239.39.65 – 10.239.39.94 | 10.239.39.95 |
| 60 | 10.239.39.96/27 | 10.239.39.97 – 10.239.39.126 | 10.239.39.127 |
| 61 | 10.239.39.128/27 | 10.239.39.129 – 10.239.39.158 | 10.239.39.159 |
| 62 | 10.239.39.160/27 | 10.239.39.161 – 10.239.39.190 | 10.239.39.191 |
| 63 | 10.239.39.192/27 | 10.239.39.193 – 10.239.39.222 | 10.239.39.223 |
| 64 | 10.239.39.224/27 | 10.239.39.225 – 10.239.39.254 | 10.239.39.255 |
| 65 | 10.239.40.0/27 | 10.239.40.1 – 10.239.40.30 | 10.239.40.31 |
| 66 | 10.239.40.32/27 | 10.239.40.33 – 10.239.40.62 | 10.239.40.63 |
| 67 | 10.239.40.64/27 | 10.239.40.65 – 10.239.40.94 | 10.239.40.95 |
| 68 | 10.239.40.96/27 | 10.239.40.97 – 10.239.40.126 | 10.239.40.127 |
| 69 | 10.239.40.128/27 | 10.239.40.129 – 10.239.40.158 | 10.239.40.159 |
| 70 | 10.239.40.160/27 | 10.239.40.161 – 10.239.40.190 | 10.239.40.191 |
| 71 | 10.239.40.192/27 | 10.239.40.193 – 10.239.40.222 | 10.239.40.223 |
| 72 | 10.239.40.224/27 | 10.239.40.225 – 10.239.40.254 | 10.239.40.255 |
| 73 | 10.239.41.0/27 | 10.239.41.1 – 10.239.41.30 | 10.239.41.31 |
| 74 | 10.239.41.32/27 | 10.239.41.33 – 10.239.41.62 | 10.239.41.63 |
| 75 | 10.239.41.64/27 | 10.239.41.65 – 10.239.41.94 | 10.239.41.95 |
| 76 | 10.239.41.96/27 | 10.239.41.97 – 10.239.41.126 | 10.239.41.127 |
| 77 | 10.239.41.128/27 | 10.239.41.129 – 10.239.41.158 | 10.239.41.159 |
| 78 | 10.239.41.160/27 | 10.239.41.161 – 10.239.41.190 | 10.239.41.191 |
| 79 | 10.239.41.192/27 | 10.239.41.193 – 10.239.41.222 | 10.239.41.223 |
| 80 | 10.239.41.224/27 | 10.239.41.225 – 10.239.41.254 | 10.239.41.255 |
| 81 | 10.239.42.0/27 | 10.239.42.1 – 10.239.42.30 | 10.239.42.31 |
| 82 | 10.239.42.32/27 | 10.239.42.33 – 10.239.42.62 | 10.239.42.63 |
| 83 | 10.239.42.64/27 | 10.239.42.65 – 10.239.42.94 | 10.239.42.95 |
| 84 | 10.239.42.96/27 | 10.239.42.97 – 10.239.42.126 | 10.239.42.127 |
| 85 | 10.239.42.128/27 | 10.239.42.129 – 10.239.42.158 | 10.239.42.159 |
| 86 | 10.239.42.160/27 | 10.239.42.161 – 10.239.42.190 | 10.239.42.191 |
| 87 | 10.239.42.192/27 | 10.239.42.193 – 10.239.42.222 | 10.239.42.223 |
| 88 | 10.239.42.224/27 | 10.239.42.225 – 10.239.42.254 | 10.239.42.255 |
| 89 | 10.239.43.0/27 | 10.239.43.1 – 10.239.43.30 | 10.239.43.31 |
| 90 | 10.239.43.32/27 | 10.239.43.33 – 10.239.43.62 | 10.239.43.63 |
| 91 | 10.239.43.64/27 | 10.239.43.65 – 10.239.43.94 | 10.239.43.95 |
| 92 | 10.239.43.96/27 | 10.239.43.97 – 10.239.43.126 | 10.239.43.127 |
| 93 | 10.239.43.128/27 | 10.239.43.129 – 10.239.43.158 | 10.239.43.159 |
| 94 | 10.239.43.160/27 | 10.239.43.161 – 10.239.43.190 | 10.239.43.191 |
| 95 | 10.239.43.192/27 | 10.239.43.193 – 10.239.43.222 | 10.239.43.223 |
| 96 | 10.239.43.224/27 | 10.239.43.225 – 10.239.43.254 | 10.239.43.255 |
| 97 | 10.239.44.0/27 | 10.239.44.1 – 10.239.44.30 | 10.239.44.31 |
| 98 | 10.239.44.32/27 | 10.239.44.33 – 10.239.44.62 | 10.239.44.63 |
| 99 | 10.239.44.64/27 | 10.239.44.65 – 10.239.44.94 | 10.239.44.95 |
| 100 | 10.239.44.96/27 | 10.239.44.97 – 10.239.44.126 | 10.239.44.127 |
| 101 | 10.239.44.128/27 | 10.239.44.129 – 10.239.44.158 | 10.239.44.159 |
| 102 | 10.239.44.160/27 | 10.239.44.161 – 10.239.44.190 | 10.239.44.191 |
| 103 | 10.239.44.192/27 | 10.239.44.193 – 10.239.44.222 | 10.239.44.223 |
| 104 | 10.239.44.224/27 | 10.239.44.225 – 10.239.44.254 | 10.239.44.255 |
| 105 | 10.239.45.0/27 | 10.239.45.1 – 10.239.45.30 | 10.239.45.31 |
| 106 | 10.239.45.32/27 | 10.239.45.33 – 10.239.45.62 | 10.239.45.63 |
| 107 | 10.239.45.64/27 | 10.239.45.65 – 10.239.45.94 | 10.239.45.95 |
| 108 | 10.239.45.96/27 | 10.239.45.97 – 10.239.45.126 | 10.239.45.127 |
| 109 | 10.239.45.128/27 | 10.239.45.129 – 10.239.45.158 | 10.239.45.159 |
| 110 | 10.239.45.160/27 | 10.239.45.161 – 10.239.45.190 | 10.239.45.191 |
| 111 | 10.239.45.192/27 | 10.239.45.193 – 10.239.45.222 | 10.239.45.223 |
| 112 | 10.239.45.224/27 | 10.239.45.225 – 10.239.45.254 | 10.239.45.255 |
| 113 | 10.239.46.0/27 | 10.239.46.1 – 10.239.46.30 | 10.239.46.31 |
| 114 | 10.239.46.32/27 | 10.239.46.33 – 10.239.46.62 | 10.239.46.63 |
| 115 | 10.239.46.64/27 | 10.239.46.65 – 10.239.46.94 | 10.239.46.95 |
| 116 | 10.239.46.96/27 | 10.239.46.97 – 10.239.46.126 | 10.239.46.127 |
| 117 | 10.239.46.128/27 | 10.239.46.129 – 10.239.46.158 | 10.239.46.159 |
| 118 | 10.239.46.160/27 | 10.239.46.161 – 10.239.46.190 | 10.239.46.191 |
| 119 | 10.239.46.192/27 | 10.239.46.193 – 10.239.46.222 | 10.239.46.223 |
| 120 | 10.239.46.224/27 | 10.239.46.225 – 10.239.46.254 | 10.239.46.255 |
| 121 | 10.239.47.0/27 | 10.239.47.1 – 10.239.47.30 | 10.239.47.31 |
| 122 | 10.239.47.32/27 | 10.239.47.33 – 10.239.47.62 | 10.239.47.63 |
| 123 | 10.239.47.64/27 | 10.239.47.65 – 10.239.47.94 | 10.239.47.95 |
| 124 | 10.239.47.96/27 | 10.239.47.97 – 10.239.47.126 | 10.239.47.127 |
| 125 | 10.239.47.128/27 | 10.239.47.129 – 10.239.47.158 | 10.239.47.159 |
| 126 | 10.239.47.160/27 | 10.239.47.161 – 10.239.47.190 | 10.239.47.191 |
| 127 | 10.239.47.192/27 | 10.239.47.193 – 10.239.47.222 | 10.239.47.223 |
| 128 | 10.239.47.224/27 | 10.239.47.225 – 10.239.47.254 | 10.239.47.255 |
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 /20 |
|---|---|---|---|---|
| /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 | - |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 1 |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 2 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 4 split → |
| /23 | 255.255.254.0 | 512 | 510 | 8 split → |
| /24 | 255.255.255.0 | 256 | 254 | 16 split → |
| /25 | 255.255.255.128 | 128 | 126 | 32 split → |
| /26 | 255.255.255.192 | 64 | 62 | 64 split → |
| /27 | 255.255.255.224 | 32 | 30 | 128 split → |
| /28 | 255.255.255.240 | 16 | 14 | 256 split → |
| /29 | 255.255.255.248 | 8 | 6 | 512 split → |
| /30 | 255.255.255.252 | 4 | 2 | 1,024 split → |
| /31 | 255.255.255.254 | 2 | 2 | 2,048 split → |
| /32 | 255.255.255.255 | 1 | 1 | 4,096 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.