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)10.28.0.0/15
network10.28.0.0/15
broadcast10.29.255.255
first host10.28.0.1
last host10.29.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.28.0.0/15
address00001010.00011100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00011100.00000000.00000000
broadcast00001010.00011101.11111111.11111111
green = network part, grey = host part
hex0x0a1c0000
decimal169607168
reverse dns0.0.28.10.in-addr.arpa
ipv4-mapped::ffff:a1c:0
/15 split into /21 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.28.0.0/21 | 10.28.0.1 – 10.28.7.254 | 10.28.7.255 |
| 2 | 10.28.8.0/21 | 10.28.8.1 – 10.28.15.254 | 10.28.15.255 |
| 3 | 10.28.16.0/21 | 10.28.16.1 – 10.28.23.254 | 10.28.23.255 |
| 4 | 10.28.24.0/21 | 10.28.24.1 – 10.28.31.254 | 10.28.31.255 |
| 5 | 10.28.32.0/21 | 10.28.32.1 – 10.28.39.254 | 10.28.39.255 |
| 6 | 10.28.40.0/21 | 10.28.40.1 – 10.28.47.254 | 10.28.47.255 |
| 7 | 10.28.48.0/21 | 10.28.48.1 – 10.28.55.254 | 10.28.55.255 |
| 8 | 10.28.56.0/21 | 10.28.56.1 – 10.28.63.254 | 10.28.63.255 |
| 9 | 10.28.64.0/21 | 10.28.64.1 – 10.28.71.254 | 10.28.71.255 |
| 10 | 10.28.72.0/21 | 10.28.72.1 – 10.28.79.254 | 10.28.79.255 |
| 11 | 10.28.80.0/21 | 10.28.80.1 – 10.28.87.254 | 10.28.87.255 |
| 12 | 10.28.88.0/21 | 10.28.88.1 – 10.28.95.254 | 10.28.95.255 |
| 13 | 10.28.96.0/21 | 10.28.96.1 – 10.28.103.254 | 10.28.103.255 |
| 14 | 10.28.104.0/21 | 10.28.104.1 – 10.28.111.254 | 10.28.111.255 |
| 15 | 10.28.112.0/21 | 10.28.112.1 – 10.28.119.254 | 10.28.119.255 |
| 16 | 10.28.120.0/21 | 10.28.120.1 – 10.28.127.254 | 10.28.127.255 |
| 17 | 10.28.128.0/21 | 10.28.128.1 – 10.28.135.254 | 10.28.135.255 |
| 18 | 10.28.136.0/21 | 10.28.136.1 – 10.28.143.254 | 10.28.143.255 |
| 19 | 10.28.144.0/21 | 10.28.144.1 – 10.28.151.254 | 10.28.151.255 |
| 20 | 10.28.152.0/21 | 10.28.152.1 – 10.28.159.254 | 10.28.159.255 |
| 21 | 10.28.160.0/21 | 10.28.160.1 – 10.28.167.254 | 10.28.167.255 |
| 22 | 10.28.168.0/21 | 10.28.168.1 – 10.28.175.254 | 10.28.175.255 |
| 23 | 10.28.176.0/21 | 10.28.176.1 – 10.28.183.254 | 10.28.183.255 |
| 24 | 10.28.184.0/21 | 10.28.184.1 – 10.28.191.254 | 10.28.191.255 |
| 25 | 10.28.192.0/21 | 10.28.192.1 – 10.28.199.254 | 10.28.199.255 |
| 26 | 10.28.200.0/21 | 10.28.200.1 – 10.28.207.254 | 10.28.207.255 |
| 27 | 10.28.208.0/21 | 10.28.208.1 – 10.28.215.254 | 10.28.215.255 |
| 28 | 10.28.216.0/21 | 10.28.216.1 – 10.28.223.254 | 10.28.223.255 |
| 29 | 10.28.224.0/21 | 10.28.224.1 – 10.28.231.254 | 10.28.231.255 |
| 30 | 10.28.232.0/21 | 10.28.232.1 – 10.28.239.254 | 10.28.239.255 |
| 31 | 10.28.240.0/21 | 10.28.240.1 – 10.28.247.254 | 10.28.247.255 |
| 32 | 10.28.248.0/21 | 10.28.248.1 – 10.28.255.254 | 10.28.255.255 |
| 33 | 10.29.0.0/21 | 10.29.0.1 – 10.29.7.254 | 10.29.7.255 |
| 34 | 10.29.8.0/21 | 10.29.8.1 – 10.29.15.254 | 10.29.15.255 |
| 35 | 10.29.16.0/21 | 10.29.16.1 – 10.29.23.254 | 10.29.23.255 |
| 36 | 10.29.24.0/21 | 10.29.24.1 – 10.29.31.254 | 10.29.31.255 |
| 37 | 10.29.32.0/21 | 10.29.32.1 – 10.29.39.254 | 10.29.39.255 |
| 38 | 10.29.40.0/21 | 10.29.40.1 – 10.29.47.254 | 10.29.47.255 |
| 39 | 10.29.48.0/21 | 10.29.48.1 – 10.29.55.254 | 10.29.55.255 |
| 40 | 10.29.56.0/21 | 10.29.56.1 – 10.29.63.254 | 10.29.63.255 |
| 41 | 10.29.64.0/21 | 10.29.64.1 – 10.29.71.254 | 10.29.71.255 |
| 42 | 10.29.72.0/21 | 10.29.72.1 – 10.29.79.254 | 10.29.79.255 |
| 43 | 10.29.80.0/21 | 10.29.80.1 – 10.29.87.254 | 10.29.87.255 |
| 44 | 10.29.88.0/21 | 10.29.88.1 – 10.29.95.254 | 10.29.95.255 |
| 45 | 10.29.96.0/21 | 10.29.96.1 – 10.29.103.254 | 10.29.103.255 |
| 46 | 10.29.104.0/21 | 10.29.104.1 – 10.29.111.254 | 10.29.111.255 |
| 47 | 10.29.112.0/21 | 10.29.112.1 – 10.29.119.254 | 10.29.119.255 |
| 48 | 10.29.120.0/21 | 10.29.120.1 – 10.29.127.254 | 10.29.127.255 |
| 49 | 10.29.128.0/21 | 10.29.128.1 – 10.29.135.254 | 10.29.135.255 |
| 50 | 10.29.136.0/21 | 10.29.136.1 – 10.29.143.254 | 10.29.143.255 |
| 51 | 10.29.144.0/21 | 10.29.144.1 – 10.29.151.254 | 10.29.151.255 |
| 52 | 10.29.152.0/21 | 10.29.152.1 – 10.29.159.254 | 10.29.159.255 |
| 53 | 10.29.160.0/21 | 10.29.160.1 – 10.29.167.254 | 10.29.167.255 |
| 54 | 10.29.168.0/21 | 10.29.168.1 – 10.29.175.254 | 10.29.175.255 |
| 55 | 10.29.176.0/21 | 10.29.176.1 – 10.29.183.254 | 10.29.183.255 |
| 56 | 10.29.184.0/21 | 10.29.184.1 – 10.29.191.254 | 10.29.191.255 |
| 57 | 10.29.192.0/21 | 10.29.192.1 – 10.29.199.254 | 10.29.199.255 |
| 58 | 10.29.200.0/21 | 10.29.200.1 – 10.29.207.254 | 10.29.207.255 |
| 59 | 10.29.208.0/21 | 10.29.208.1 – 10.29.215.254 | 10.29.215.255 |
| 60 | 10.29.216.0/21 | 10.29.216.1 – 10.29.223.254 | 10.29.223.255 |
| 61 | 10.29.224.0/21 | 10.29.224.1 – 10.29.231.254 | 10.29.231.255 |
| 62 | 10.29.232.0/21 | 10.29.232.1 – 10.29.239.254 | 10.29.239.255 |
| 63 | 10.29.240.0/21 | 10.29.240.1 – 10.29.247.254 | 10.29.247.255 |
| 64 | 10.29.248.0/21 | 10.29.248.1 – 10.29.255.254 | 10.29.255.255 |
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 /15 |
|---|---|---|---|---|
| /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 | 1 |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 2 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 4 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 8 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 16 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 32 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 64 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 128 split → |
| /23 | 255.255.254.0 | 512 | 510 | 256 split → |
| /24 | 255.255.255.0 | 256 | 254 | 512 split → |
| /25 | 255.255.255.128 | 128 | 126 | 1,024 split → |
| /26 | 255.255.255.192 | 64 | 62 | 2,048 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4,096 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8,192 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16,384 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32,768 split → |
| /31 | 255.255.255.254 | 2 | 2 | 65,536 split → |
| /32 | 255.255.255.255 | 1 | 1 | 131,072 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.