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)10.0.0.0/8
network10.0.0.0/8
broadcast10.255.255.255
first host10.0.0.1
last host10.255.255.254
subnet mask255.0.0.0
wildcard0.255.255.255
addresses16,777,216
usable hosts16,777,214
classA
ipcalc 10.0.0.0/8
address00001010.00000000.00000000.00000000
subnet mask11111111.00000000.00000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.11111111.11111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0
/8 split into /13 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.0.0/13 | 10.0.0.1 – 10.7.255.254 | 10.7.255.255 |
| 2 | 10.8.0.0/13 | 10.8.0.1 – 10.15.255.254 | 10.15.255.255 |
| 3 | 10.16.0.0/13 | 10.16.0.1 – 10.23.255.254 | 10.23.255.255 |
| 4 | 10.24.0.0/13 | 10.24.0.1 – 10.31.255.254 | 10.31.255.255 |
| 5 | 10.32.0.0/13 | 10.32.0.1 – 10.39.255.254 | 10.39.255.255 |
| 6 | 10.40.0.0/13 | 10.40.0.1 – 10.47.255.254 | 10.47.255.255 |
| 7 | 10.48.0.0/13 | 10.48.0.1 – 10.55.255.254 | 10.55.255.255 |
| 8 | 10.56.0.0/13 | 10.56.0.1 – 10.63.255.254 | 10.63.255.255 |
| 9 | 10.64.0.0/13 | 10.64.0.1 – 10.71.255.254 | 10.71.255.255 |
| 10 | 10.72.0.0/13 | 10.72.0.1 – 10.79.255.254 | 10.79.255.255 |
| 11 | 10.80.0.0/13 | 10.80.0.1 – 10.87.255.254 | 10.87.255.255 |
| 12 | 10.88.0.0/13 | 10.88.0.1 – 10.95.255.254 | 10.95.255.255 |
| 13 | 10.96.0.0/13 | 10.96.0.1 – 10.103.255.254 | 10.103.255.255 |
| 14 | 10.104.0.0/13 | 10.104.0.1 – 10.111.255.254 | 10.111.255.255 |
| 15 | 10.112.0.0/13 | 10.112.0.1 – 10.119.255.254 | 10.119.255.255 |
| 16 | 10.120.0.0/13 | 10.120.0.1 – 10.127.255.254 | 10.127.255.255 |
| 17 | 10.128.0.0/13 | 10.128.0.1 – 10.135.255.254 | 10.135.255.255 |
| 18 | 10.136.0.0/13 | 10.136.0.1 – 10.143.255.254 | 10.143.255.255 |
| 19 | 10.144.0.0/13 | 10.144.0.1 – 10.151.255.254 | 10.151.255.255 |
| 20 | 10.152.0.0/13 | 10.152.0.1 – 10.159.255.254 | 10.159.255.255 |
| 21 | 10.160.0.0/13 | 10.160.0.1 – 10.167.255.254 | 10.167.255.255 |
| 22 | 10.168.0.0/13 | 10.168.0.1 – 10.175.255.254 | 10.175.255.255 |
| 23 | 10.176.0.0/13 | 10.176.0.1 – 10.183.255.254 | 10.183.255.255 |
| 24 | 10.184.0.0/13 | 10.184.0.1 – 10.191.255.254 | 10.191.255.255 |
| 25 | 10.192.0.0/13 | 10.192.0.1 – 10.199.255.254 | 10.199.255.255 |
| 26 | 10.200.0.0/13 | 10.200.0.1 – 10.207.255.254 | 10.207.255.255 |
| 27 | 10.208.0.0/13 | 10.208.0.1 – 10.215.255.254 | 10.215.255.255 |
| 28 | 10.216.0.0/13 | 10.216.0.1 – 10.223.255.254 | 10.223.255.255 |
| 29 | 10.224.0.0/13 | 10.224.0.1 – 10.231.255.254 | 10.231.255.255 |
| 30 | 10.232.0.0/13 | 10.232.0.1 – 10.239.255.254 | 10.239.255.255 |
| 31 | 10.240.0.0/13 | 10.240.0.1 – 10.247.255.254 | 10.247.255.255 |
| 32 | 10.248.0.0/13 | 10.248.0.1 – 10.255.255.254 | 10.255.255.255 |
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 /8 |
|---|---|---|---|---|
| /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 | 1 |
| /9 | 255.128.0.0 | 8,388,608 | 8,388,606 | 2 split → |
| /10 | 255.192.0.0 | 4,194,304 | 4,194,302 | 4 split → |
| /11 | 255.224.0.0 | 2,097,152 | 2,097,150 | 8 split → |
| /12 | 255.240.0.0 | 1,048,576 | 1,048,574 | 16 split → |
| /13 | 255.248.0.0 | 524,288 | 524,286 | 32 split → |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 64 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 128 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 256 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 512 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 1,024 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 2,048 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 4,096 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 8,192 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 16,384 split → |
| /23 | 255.255.254.0 | 512 | 510 | 32,768 split → |
| /24 | 255.255.255.0 | 256 | 254 | 65,536 split → |
| /25 | 255.255.255.128 | 128 | 126 | 131,072 split → |
| /26 | 255.255.255.192 | 64 | 62 | 262,144 split → |
| /27 | 255.255.255.224 | 32 | 30 | 524,288 split → |
| /28 | 255.255.255.240 | 16 | 14 | 1,048,576 split → |
| /29 | 255.255.255.248 | 8 | 6 | 2,097,152 split → |
| /30 | 255.255.255.252 | 4 | 2 | 4,194,304 split → |
| /31 | 255.255.255.254 | 2 | 2 | 8,388,608 split → |
| /32 | 255.255.255.255 | 1 | 1 | 16,777,216 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.