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)10.201.0.0/20
network10.201.0.0/20
broadcast10.201.15.255
first host10.201.0.1
last host10.201.15.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.201.0.0/20
address00001010.11001001.00000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.11001001.00000000.00000000
broadcast00001010.11001001.00001111.11111111
green = network part, grey = host part
hex0x0ac90000
decimal180944896
reverse dns0.0.201.10.in-addr.arpa
ipv4-mapped::ffff:ac9:0
/20 split into /26 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.201.0.0/26 | 10.201.0.1 – 10.201.0.62 | 10.201.0.63 |
| 2 | 10.201.0.64/26 | 10.201.0.65 – 10.201.0.126 | 10.201.0.127 |
| 3 | 10.201.0.128/26 | 10.201.0.129 – 10.201.0.190 | 10.201.0.191 |
| 4 | 10.201.0.192/26 | 10.201.0.193 – 10.201.0.254 | 10.201.0.255 |
| 5 | 10.201.1.0/26 | 10.201.1.1 – 10.201.1.62 | 10.201.1.63 |
| 6 | 10.201.1.64/26 | 10.201.1.65 – 10.201.1.126 | 10.201.1.127 |
| 7 | 10.201.1.128/26 | 10.201.1.129 – 10.201.1.190 | 10.201.1.191 |
| 8 | 10.201.1.192/26 | 10.201.1.193 – 10.201.1.254 | 10.201.1.255 |
| 9 | 10.201.2.0/26 | 10.201.2.1 – 10.201.2.62 | 10.201.2.63 |
| 10 | 10.201.2.64/26 | 10.201.2.65 – 10.201.2.126 | 10.201.2.127 |
| 11 | 10.201.2.128/26 | 10.201.2.129 – 10.201.2.190 | 10.201.2.191 |
| 12 | 10.201.2.192/26 | 10.201.2.193 – 10.201.2.254 | 10.201.2.255 |
| 13 | 10.201.3.0/26 | 10.201.3.1 – 10.201.3.62 | 10.201.3.63 |
| 14 | 10.201.3.64/26 | 10.201.3.65 – 10.201.3.126 | 10.201.3.127 |
| 15 | 10.201.3.128/26 | 10.201.3.129 – 10.201.3.190 | 10.201.3.191 |
| 16 | 10.201.3.192/26 | 10.201.3.193 – 10.201.3.254 | 10.201.3.255 |
| 17 | 10.201.4.0/26 | 10.201.4.1 – 10.201.4.62 | 10.201.4.63 |
| 18 | 10.201.4.64/26 | 10.201.4.65 – 10.201.4.126 | 10.201.4.127 |
| 19 | 10.201.4.128/26 | 10.201.4.129 – 10.201.4.190 | 10.201.4.191 |
| 20 | 10.201.4.192/26 | 10.201.4.193 – 10.201.4.254 | 10.201.4.255 |
| 21 | 10.201.5.0/26 | 10.201.5.1 – 10.201.5.62 | 10.201.5.63 |
| 22 | 10.201.5.64/26 | 10.201.5.65 – 10.201.5.126 | 10.201.5.127 |
| 23 | 10.201.5.128/26 | 10.201.5.129 – 10.201.5.190 | 10.201.5.191 |
| 24 | 10.201.5.192/26 | 10.201.5.193 – 10.201.5.254 | 10.201.5.255 |
| 25 | 10.201.6.0/26 | 10.201.6.1 – 10.201.6.62 | 10.201.6.63 |
| 26 | 10.201.6.64/26 | 10.201.6.65 – 10.201.6.126 | 10.201.6.127 |
| 27 | 10.201.6.128/26 | 10.201.6.129 – 10.201.6.190 | 10.201.6.191 |
| 28 | 10.201.6.192/26 | 10.201.6.193 – 10.201.6.254 | 10.201.6.255 |
| 29 | 10.201.7.0/26 | 10.201.7.1 – 10.201.7.62 | 10.201.7.63 |
| 30 | 10.201.7.64/26 | 10.201.7.65 – 10.201.7.126 | 10.201.7.127 |
| 31 | 10.201.7.128/26 | 10.201.7.129 – 10.201.7.190 | 10.201.7.191 |
| 32 | 10.201.7.192/26 | 10.201.7.193 – 10.201.7.254 | 10.201.7.255 |
| 33 | 10.201.8.0/26 | 10.201.8.1 – 10.201.8.62 | 10.201.8.63 |
| 34 | 10.201.8.64/26 | 10.201.8.65 – 10.201.8.126 | 10.201.8.127 |
| 35 | 10.201.8.128/26 | 10.201.8.129 – 10.201.8.190 | 10.201.8.191 |
| 36 | 10.201.8.192/26 | 10.201.8.193 – 10.201.8.254 | 10.201.8.255 |
| 37 | 10.201.9.0/26 | 10.201.9.1 – 10.201.9.62 | 10.201.9.63 |
| 38 | 10.201.9.64/26 | 10.201.9.65 – 10.201.9.126 | 10.201.9.127 |
| 39 | 10.201.9.128/26 | 10.201.9.129 – 10.201.9.190 | 10.201.9.191 |
| 40 | 10.201.9.192/26 | 10.201.9.193 – 10.201.9.254 | 10.201.9.255 |
| 41 | 10.201.10.0/26 | 10.201.10.1 – 10.201.10.62 | 10.201.10.63 |
| 42 | 10.201.10.64/26 | 10.201.10.65 – 10.201.10.126 | 10.201.10.127 |
| 43 | 10.201.10.128/26 | 10.201.10.129 – 10.201.10.190 | 10.201.10.191 |
| 44 | 10.201.10.192/26 | 10.201.10.193 – 10.201.10.254 | 10.201.10.255 |
| 45 | 10.201.11.0/26 | 10.201.11.1 – 10.201.11.62 | 10.201.11.63 |
| 46 | 10.201.11.64/26 | 10.201.11.65 – 10.201.11.126 | 10.201.11.127 |
| 47 | 10.201.11.128/26 | 10.201.11.129 – 10.201.11.190 | 10.201.11.191 |
| 48 | 10.201.11.192/26 | 10.201.11.193 – 10.201.11.254 | 10.201.11.255 |
| 49 | 10.201.12.0/26 | 10.201.12.1 – 10.201.12.62 | 10.201.12.63 |
| 50 | 10.201.12.64/26 | 10.201.12.65 – 10.201.12.126 | 10.201.12.127 |
| 51 | 10.201.12.128/26 | 10.201.12.129 – 10.201.12.190 | 10.201.12.191 |
| 52 | 10.201.12.192/26 | 10.201.12.193 – 10.201.12.254 | 10.201.12.255 |
| 53 | 10.201.13.0/26 | 10.201.13.1 – 10.201.13.62 | 10.201.13.63 |
| 54 | 10.201.13.64/26 | 10.201.13.65 – 10.201.13.126 | 10.201.13.127 |
| 55 | 10.201.13.128/26 | 10.201.13.129 – 10.201.13.190 | 10.201.13.191 |
| 56 | 10.201.13.192/26 | 10.201.13.193 – 10.201.13.254 | 10.201.13.255 |
| 57 | 10.201.14.0/26 | 10.201.14.1 – 10.201.14.62 | 10.201.14.63 |
| 58 | 10.201.14.64/26 | 10.201.14.65 – 10.201.14.126 | 10.201.14.127 |
| 59 | 10.201.14.128/26 | 10.201.14.129 – 10.201.14.190 | 10.201.14.191 |
| 60 | 10.201.14.192/26 | 10.201.14.193 – 10.201.14.254 | 10.201.14.255 |
| 61 | 10.201.15.0/26 | 10.201.15.1 – 10.201.15.62 | 10.201.15.63 |
| 62 | 10.201.15.64/26 | 10.201.15.65 – 10.201.15.126 | 10.201.15.127 |
| 63 | 10.201.15.128/26 | 10.201.15.129 – 10.201.15.190 | 10.201.15.191 |
| 64 | 10.201.15.192/26 | 10.201.15.193 – 10.201.15.254 | 10.201.15.255 |
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.