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)10.11.240.0/20
network10.11.240.0/20
broadcast10.11.255.255
first host10.11.240.1
last host10.11.255.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.11.240.0/20
address00001010.00001011.11110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001011.11110000.00000000
broadcast00001010.00001011.11111111.11111111
green = network part, grey = host part
hex0x0a0bf000
decimal168554496
reverse dns0.240.11.10.in-addr.arpa
ipv4-mapped::ffff:a0b:f000
/20 split into /27 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.11.240.0/27 | 10.11.240.1 – 10.11.240.30 | 10.11.240.31 |
| 2 | 10.11.240.32/27 | 10.11.240.33 – 10.11.240.62 | 10.11.240.63 |
| 3 | 10.11.240.64/27 | 10.11.240.65 – 10.11.240.94 | 10.11.240.95 |
| 4 | 10.11.240.96/27 | 10.11.240.97 – 10.11.240.126 | 10.11.240.127 |
| 5 | 10.11.240.128/27 | 10.11.240.129 – 10.11.240.158 | 10.11.240.159 |
| 6 | 10.11.240.160/27 | 10.11.240.161 – 10.11.240.190 | 10.11.240.191 |
| 7 | 10.11.240.192/27 | 10.11.240.193 – 10.11.240.222 | 10.11.240.223 |
| 8 | 10.11.240.224/27 | 10.11.240.225 – 10.11.240.254 | 10.11.240.255 |
| 9 | 10.11.241.0/27 | 10.11.241.1 – 10.11.241.30 | 10.11.241.31 |
| 10 | 10.11.241.32/27 | 10.11.241.33 – 10.11.241.62 | 10.11.241.63 |
| 11 | 10.11.241.64/27 | 10.11.241.65 – 10.11.241.94 | 10.11.241.95 |
| 12 | 10.11.241.96/27 | 10.11.241.97 – 10.11.241.126 | 10.11.241.127 |
| 13 | 10.11.241.128/27 | 10.11.241.129 – 10.11.241.158 | 10.11.241.159 |
| 14 | 10.11.241.160/27 | 10.11.241.161 – 10.11.241.190 | 10.11.241.191 |
| 15 | 10.11.241.192/27 | 10.11.241.193 – 10.11.241.222 | 10.11.241.223 |
| 16 | 10.11.241.224/27 | 10.11.241.225 – 10.11.241.254 | 10.11.241.255 |
| 17 | 10.11.242.0/27 | 10.11.242.1 – 10.11.242.30 | 10.11.242.31 |
| 18 | 10.11.242.32/27 | 10.11.242.33 – 10.11.242.62 | 10.11.242.63 |
| 19 | 10.11.242.64/27 | 10.11.242.65 – 10.11.242.94 | 10.11.242.95 |
| 20 | 10.11.242.96/27 | 10.11.242.97 – 10.11.242.126 | 10.11.242.127 |
| 21 | 10.11.242.128/27 | 10.11.242.129 – 10.11.242.158 | 10.11.242.159 |
| 22 | 10.11.242.160/27 | 10.11.242.161 – 10.11.242.190 | 10.11.242.191 |
| 23 | 10.11.242.192/27 | 10.11.242.193 – 10.11.242.222 | 10.11.242.223 |
| 24 | 10.11.242.224/27 | 10.11.242.225 – 10.11.242.254 | 10.11.242.255 |
| 25 | 10.11.243.0/27 | 10.11.243.1 – 10.11.243.30 | 10.11.243.31 |
| 26 | 10.11.243.32/27 | 10.11.243.33 – 10.11.243.62 | 10.11.243.63 |
| 27 | 10.11.243.64/27 | 10.11.243.65 – 10.11.243.94 | 10.11.243.95 |
| 28 | 10.11.243.96/27 | 10.11.243.97 – 10.11.243.126 | 10.11.243.127 |
| 29 | 10.11.243.128/27 | 10.11.243.129 – 10.11.243.158 | 10.11.243.159 |
| 30 | 10.11.243.160/27 | 10.11.243.161 – 10.11.243.190 | 10.11.243.191 |
| 31 | 10.11.243.192/27 | 10.11.243.193 – 10.11.243.222 | 10.11.243.223 |
| 32 | 10.11.243.224/27 | 10.11.243.225 – 10.11.243.254 | 10.11.243.255 |
| 33 | 10.11.244.0/27 | 10.11.244.1 – 10.11.244.30 | 10.11.244.31 |
| 34 | 10.11.244.32/27 | 10.11.244.33 – 10.11.244.62 | 10.11.244.63 |
| 35 | 10.11.244.64/27 | 10.11.244.65 – 10.11.244.94 | 10.11.244.95 |
| 36 | 10.11.244.96/27 | 10.11.244.97 – 10.11.244.126 | 10.11.244.127 |
| 37 | 10.11.244.128/27 | 10.11.244.129 – 10.11.244.158 | 10.11.244.159 |
| 38 | 10.11.244.160/27 | 10.11.244.161 – 10.11.244.190 | 10.11.244.191 |
| 39 | 10.11.244.192/27 | 10.11.244.193 – 10.11.244.222 | 10.11.244.223 |
| 40 | 10.11.244.224/27 | 10.11.244.225 – 10.11.244.254 | 10.11.244.255 |
| 41 | 10.11.245.0/27 | 10.11.245.1 – 10.11.245.30 | 10.11.245.31 |
| 42 | 10.11.245.32/27 | 10.11.245.33 – 10.11.245.62 | 10.11.245.63 |
| 43 | 10.11.245.64/27 | 10.11.245.65 – 10.11.245.94 | 10.11.245.95 |
| 44 | 10.11.245.96/27 | 10.11.245.97 – 10.11.245.126 | 10.11.245.127 |
| 45 | 10.11.245.128/27 | 10.11.245.129 – 10.11.245.158 | 10.11.245.159 |
| 46 | 10.11.245.160/27 | 10.11.245.161 – 10.11.245.190 | 10.11.245.191 |
| 47 | 10.11.245.192/27 | 10.11.245.193 – 10.11.245.222 | 10.11.245.223 |
| 48 | 10.11.245.224/27 | 10.11.245.225 – 10.11.245.254 | 10.11.245.255 |
| 49 | 10.11.246.0/27 | 10.11.246.1 – 10.11.246.30 | 10.11.246.31 |
| 50 | 10.11.246.32/27 | 10.11.246.33 – 10.11.246.62 | 10.11.246.63 |
| 51 | 10.11.246.64/27 | 10.11.246.65 – 10.11.246.94 | 10.11.246.95 |
| 52 | 10.11.246.96/27 | 10.11.246.97 – 10.11.246.126 | 10.11.246.127 |
| 53 | 10.11.246.128/27 | 10.11.246.129 – 10.11.246.158 | 10.11.246.159 |
| 54 | 10.11.246.160/27 | 10.11.246.161 – 10.11.246.190 | 10.11.246.191 |
| 55 | 10.11.246.192/27 | 10.11.246.193 – 10.11.246.222 | 10.11.246.223 |
| 56 | 10.11.246.224/27 | 10.11.246.225 – 10.11.246.254 | 10.11.246.255 |
| 57 | 10.11.247.0/27 | 10.11.247.1 – 10.11.247.30 | 10.11.247.31 |
| 58 | 10.11.247.32/27 | 10.11.247.33 – 10.11.247.62 | 10.11.247.63 |
| 59 | 10.11.247.64/27 | 10.11.247.65 – 10.11.247.94 | 10.11.247.95 |
| 60 | 10.11.247.96/27 | 10.11.247.97 – 10.11.247.126 | 10.11.247.127 |
| 61 | 10.11.247.128/27 | 10.11.247.129 – 10.11.247.158 | 10.11.247.159 |
| 62 | 10.11.247.160/27 | 10.11.247.161 – 10.11.247.190 | 10.11.247.191 |
| 63 | 10.11.247.192/27 | 10.11.247.193 – 10.11.247.222 | 10.11.247.223 |
| 64 | 10.11.247.224/27 | 10.11.247.225 – 10.11.247.254 | 10.11.247.255 |
| 65 | 10.11.248.0/27 | 10.11.248.1 – 10.11.248.30 | 10.11.248.31 |
| 66 | 10.11.248.32/27 | 10.11.248.33 – 10.11.248.62 | 10.11.248.63 |
| 67 | 10.11.248.64/27 | 10.11.248.65 – 10.11.248.94 | 10.11.248.95 |
| 68 | 10.11.248.96/27 | 10.11.248.97 – 10.11.248.126 | 10.11.248.127 |
| 69 | 10.11.248.128/27 | 10.11.248.129 – 10.11.248.158 | 10.11.248.159 |
| 70 | 10.11.248.160/27 | 10.11.248.161 – 10.11.248.190 | 10.11.248.191 |
| 71 | 10.11.248.192/27 | 10.11.248.193 – 10.11.248.222 | 10.11.248.223 |
| 72 | 10.11.248.224/27 | 10.11.248.225 – 10.11.248.254 | 10.11.248.255 |
| 73 | 10.11.249.0/27 | 10.11.249.1 – 10.11.249.30 | 10.11.249.31 |
| 74 | 10.11.249.32/27 | 10.11.249.33 – 10.11.249.62 | 10.11.249.63 |
| 75 | 10.11.249.64/27 | 10.11.249.65 – 10.11.249.94 | 10.11.249.95 |
| 76 | 10.11.249.96/27 | 10.11.249.97 – 10.11.249.126 | 10.11.249.127 |
| 77 | 10.11.249.128/27 | 10.11.249.129 – 10.11.249.158 | 10.11.249.159 |
| 78 | 10.11.249.160/27 | 10.11.249.161 – 10.11.249.190 | 10.11.249.191 |
| 79 | 10.11.249.192/27 | 10.11.249.193 – 10.11.249.222 | 10.11.249.223 |
| 80 | 10.11.249.224/27 | 10.11.249.225 – 10.11.249.254 | 10.11.249.255 |
| 81 | 10.11.250.0/27 | 10.11.250.1 – 10.11.250.30 | 10.11.250.31 |
| 82 | 10.11.250.32/27 | 10.11.250.33 – 10.11.250.62 | 10.11.250.63 |
| 83 | 10.11.250.64/27 | 10.11.250.65 – 10.11.250.94 | 10.11.250.95 |
| 84 | 10.11.250.96/27 | 10.11.250.97 – 10.11.250.126 | 10.11.250.127 |
| 85 | 10.11.250.128/27 | 10.11.250.129 – 10.11.250.158 | 10.11.250.159 |
| 86 | 10.11.250.160/27 | 10.11.250.161 – 10.11.250.190 | 10.11.250.191 |
| 87 | 10.11.250.192/27 | 10.11.250.193 – 10.11.250.222 | 10.11.250.223 |
| 88 | 10.11.250.224/27 | 10.11.250.225 – 10.11.250.254 | 10.11.250.255 |
| 89 | 10.11.251.0/27 | 10.11.251.1 – 10.11.251.30 | 10.11.251.31 |
| 90 | 10.11.251.32/27 | 10.11.251.33 – 10.11.251.62 | 10.11.251.63 |
| 91 | 10.11.251.64/27 | 10.11.251.65 – 10.11.251.94 | 10.11.251.95 |
| 92 | 10.11.251.96/27 | 10.11.251.97 – 10.11.251.126 | 10.11.251.127 |
| 93 | 10.11.251.128/27 | 10.11.251.129 – 10.11.251.158 | 10.11.251.159 |
| 94 | 10.11.251.160/27 | 10.11.251.161 – 10.11.251.190 | 10.11.251.191 |
| 95 | 10.11.251.192/27 | 10.11.251.193 – 10.11.251.222 | 10.11.251.223 |
| 96 | 10.11.251.224/27 | 10.11.251.225 – 10.11.251.254 | 10.11.251.255 |
| 97 | 10.11.252.0/27 | 10.11.252.1 – 10.11.252.30 | 10.11.252.31 |
| 98 | 10.11.252.32/27 | 10.11.252.33 – 10.11.252.62 | 10.11.252.63 |
| 99 | 10.11.252.64/27 | 10.11.252.65 – 10.11.252.94 | 10.11.252.95 |
| 100 | 10.11.252.96/27 | 10.11.252.97 – 10.11.252.126 | 10.11.252.127 |
| 101 | 10.11.252.128/27 | 10.11.252.129 – 10.11.252.158 | 10.11.252.159 |
| 102 | 10.11.252.160/27 | 10.11.252.161 – 10.11.252.190 | 10.11.252.191 |
| 103 | 10.11.252.192/27 | 10.11.252.193 – 10.11.252.222 | 10.11.252.223 |
| 104 | 10.11.252.224/27 | 10.11.252.225 – 10.11.252.254 | 10.11.252.255 |
| 105 | 10.11.253.0/27 | 10.11.253.1 – 10.11.253.30 | 10.11.253.31 |
| 106 | 10.11.253.32/27 | 10.11.253.33 – 10.11.253.62 | 10.11.253.63 |
| 107 | 10.11.253.64/27 | 10.11.253.65 – 10.11.253.94 | 10.11.253.95 |
| 108 | 10.11.253.96/27 | 10.11.253.97 – 10.11.253.126 | 10.11.253.127 |
| 109 | 10.11.253.128/27 | 10.11.253.129 – 10.11.253.158 | 10.11.253.159 |
| 110 | 10.11.253.160/27 | 10.11.253.161 – 10.11.253.190 | 10.11.253.191 |
| 111 | 10.11.253.192/27 | 10.11.253.193 – 10.11.253.222 | 10.11.253.223 |
| 112 | 10.11.253.224/27 | 10.11.253.225 – 10.11.253.254 | 10.11.253.255 |
| 113 | 10.11.254.0/27 | 10.11.254.1 – 10.11.254.30 | 10.11.254.31 |
| 114 | 10.11.254.32/27 | 10.11.254.33 – 10.11.254.62 | 10.11.254.63 |
| 115 | 10.11.254.64/27 | 10.11.254.65 – 10.11.254.94 | 10.11.254.95 |
| 116 | 10.11.254.96/27 | 10.11.254.97 – 10.11.254.126 | 10.11.254.127 |
| 117 | 10.11.254.128/27 | 10.11.254.129 – 10.11.254.158 | 10.11.254.159 |
| 118 | 10.11.254.160/27 | 10.11.254.161 – 10.11.254.190 | 10.11.254.191 |
| 119 | 10.11.254.192/27 | 10.11.254.193 – 10.11.254.222 | 10.11.254.223 |
| 120 | 10.11.254.224/27 | 10.11.254.225 – 10.11.254.254 | 10.11.254.255 |
| 121 | 10.11.255.0/27 | 10.11.255.1 – 10.11.255.30 | 10.11.255.31 |
| 122 | 10.11.255.32/27 | 10.11.255.33 – 10.11.255.62 | 10.11.255.63 |
| 123 | 10.11.255.64/27 | 10.11.255.65 – 10.11.255.94 | 10.11.255.95 |
| 124 | 10.11.255.96/27 | 10.11.255.97 – 10.11.255.126 | 10.11.255.127 |
| 125 | 10.11.255.128/27 | 10.11.255.129 – 10.11.255.158 | 10.11.255.159 |
| 126 | 10.11.255.160/27 | 10.11.255.161 – 10.11.255.190 | 10.11.255.191 |
| 127 | 10.11.255.192/27 | 10.11.255.193 – 10.11.255.222 | 10.11.255.223 |
| 128 | 10.11.255.224/27 | 10.11.255.225 – 10.11.255.254 | 10.11.255.255 |
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 /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.