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)10.15.192.0/18
network10.15.192.0/18
broadcast10.15.255.255
first host10.15.192.1
last host10.15.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.15.192.0/18
address00001010.00001111.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00001111.11000000.00000000
broadcast00001010.00001111.11111111.11111111
green = network part, grey = host part
hex0x0a0fc000
decimal168804352
reverse dns0.192.15.10.in-addr.arpa
ipv4-mapped::ffff:a0f:c000
/18 split into /24 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.15.192.0/24 | 10.15.192.1 – 10.15.192.254 | 10.15.192.255 |
| 2 | 10.15.193.0/24 | 10.15.193.1 – 10.15.193.254 | 10.15.193.255 |
| 3 | 10.15.194.0/24 | 10.15.194.1 – 10.15.194.254 | 10.15.194.255 |
| 4 | 10.15.195.0/24 | 10.15.195.1 – 10.15.195.254 | 10.15.195.255 |
| 5 | 10.15.196.0/24 | 10.15.196.1 – 10.15.196.254 | 10.15.196.255 |
| 6 | 10.15.197.0/24 | 10.15.197.1 – 10.15.197.254 | 10.15.197.255 |
| 7 | 10.15.198.0/24 | 10.15.198.1 – 10.15.198.254 | 10.15.198.255 |
| 8 | 10.15.199.0/24 | 10.15.199.1 – 10.15.199.254 | 10.15.199.255 |
| 9 | 10.15.200.0/24 | 10.15.200.1 – 10.15.200.254 | 10.15.200.255 |
| 10 | 10.15.201.0/24 | 10.15.201.1 – 10.15.201.254 | 10.15.201.255 |
| 11 | 10.15.202.0/24 | 10.15.202.1 – 10.15.202.254 | 10.15.202.255 |
| 12 | 10.15.203.0/24 | 10.15.203.1 – 10.15.203.254 | 10.15.203.255 |
| 13 | 10.15.204.0/24 | 10.15.204.1 – 10.15.204.254 | 10.15.204.255 |
| 14 | 10.15.205.0/24 | 10.15.205.1 – 10.15.205.254 | 10.15.205.255 |
| 15 | 10.15.206.0/24 | 10.15.206.1 – 10.15.206.254 | 10.15.206.255 |
| 16 | 10.15.207.0/24 | 10.15.207.1 – 10.15.207.254 | 10.15.207.255 |
| 17 | 10.15.208.0/24 | 10.15.208.1 – 10.15.208.254 | 10.15.208.255 |
| 18 | 10.15.209.0/24 | 10.15.209.1 – 10.15.209.254 | 10.15.209.255 |
| 19 | 10.15.210.0/24 | 10.15.210.1 – 10.15.210.254 | 10.15.210.255 |
| 20 | 10.15.211.0/24 | 10.15.211.1 – 10.15.211.254 | 10.15.211.255 |
| 21 | 10.15.212.0/24 | 10.15.212.1 – 10.15.212.254 | 10.15.212.255 |
| 22 | 10.15.213.0/24 | 10.15.213.1 – 10.15.213.254 | 10.15.213.255 |
| 23 | 10.15.214.0/24 | 10.15.214.1 – 10.15.214.254 | 10.15.214.255 |
| 24 | 10.15.215.0/24 | 10.15.215.1 – 10.15.215.254 | 10.15.215.255 |
| 25 | 10.15.216.0/24 | 10.15.216.1 – 10.15.216.254 | 10.15.216.255 |
| 26 | 10.15.217.0/24 | 10.15.217.1 – 10.15.217.254 | 10.15.217.255 |
| 27 | 10.15.218.0/24 | 10.15.218.1 – 10.15.218.254 | 10.15.218.255 |
| 28 | 10.15.219.0/24 | 10.15.219.1 – 10.15.219.254 | 10.15.219.255 |
| 29 | 10.15.220.0/24 | 10.15.220.1 – 10.15.220.254 | 10.15.220.255 |
| 30 | 10.15.221.0/24 | 10.15.221.1 – 10.15.221.254 | 10.15.221.255 |
| 31 | 10.15.222.0/24 | 10.15.222.1 – 10.15.222.254 | 10.15.222.255 |
| 32 | 10.15.223.0/24 | 10.15.223.1 – 10.15.223.254 | 10.15.223.255 |
| 33 | 10.15.224.0/24 | 10.15.224.1 – 10.15.224.254 | 10.15.224.255 |
| 34 | 10.15.225.0/24 | 10.15.225.1 – 10.15.225.254 | 10.15.225.255 |
| 35 | 10.15.226.0/24 | 10.15.226.1 – 10.15.226.254 | 10.15.226.255 |
| 36 | 10.15.227.0/24 | 10.15.227.1 – 10.15.227.254 | 10.15.227.255 |
| 37 | 10.15.228.0/24 | 10.15.228.1 – 10.15.228.254 | 10.15.228.255 |
| 38 | 10.15.229.0/24 | 10.15.229.1 – 10.15.229.254 | 10.15.229.255 |
| 39 | 10.15.230.0/24 | 10.15.230.1 – 10.15.230.254 | 10.15.230.255 |
| 40 | 10.15.231.0/24 | 10.15.231.1 – 10.15.231.254 | 10.15.231.255 |
| 41 | 10.15.232.0/24 | 10.15.232.1 – 10.15.232.254 | 10.15.232.255 |
| 42 | 10.15.233.0/24 | 10.15.233.1 – 10.15.233.254 | 10.15.233.255 |
| 43 | 10.15.234.0/24 | 10.15.234.1 – 10.15.234.254 | 10.15.234.255 |
| 44 | 10.15.235.0/24 | 10.15.235.1 – 10.15.235.254 | 10.15.235.255 |
| 45 | 10.15.236.0/24 | 10.15.236.1 – 10.15.236.254 | 10.15.236.255 |
| 46 | 10.15.237.0/24 | 10.15.237.1 – 10.15.237.254 | 10.15.237.255 |
| 47 | 10.15.238.0/24 | 10.15.238.1 – 10.15.238.254 | 10.15.238.255 |
| 48 | 10.15.239.0/24 | 10.15.239.1 – 10.15.239.254 | 10.15.239.255 |
| 49 | 10.15.240.0/24 | 10.15.240.1 – 10.15.240.254 | 10.15.240.255 |
| 50 | 10.15.241.0/24 | 10.15.241.1 – 10.15.241.254 | 10.15.241.255 |
| 51 | 10.15.242.0/24 | 10.15.242.1 – 10.15.242.254 | 10.15.242.255 |
| 52 | 10.15.243.0/24 | 10.15.243.1 – 10.15.243.254 | 10.15.243.255 |
| 53 | 10.15.244.0/24 | 10.15.244.1 – 10.15.244.254 | 10.15.244.255 |
| 54 | 10.15.245.0/24 | 10.15.245.1 – 10.15.245.254 | 10.15.245.255 |
| 55 | 10.15.246.0/24 | 10.15.246.1 – 10.15.246.254 | 10.15.246.255 |
| 56 | 10.15.247.0/24 | 10.15.247.1 – 10.15.247.254 | 10.15.247.255 |
| 57 | 10.15.248.0/24 | 10.15.248.1 – 10.15.248.254 | 10.15.248.255 |
| 58 | 10.15.249.0/24 | 10.15.249.1 – 10.15.249.254 | 10.15.249.255 |
| 59 | 10.15.250.0/24 | 10.15.250.1 – 10.15.250.254 | 10.15.250.255 |
| 60 | 10.15.251.0/24 | 10.15.251.1 – 10.15.251.254 | 10.15.251.255 |
| 61 | 10.15.252.0/24 | 10.15.252.1 – 10.15.252.254 | 10.15.252.255 |
| 62 | 10.15.253.0/24 | 10.15.253.1 – 10.15.253.254 | 10.15.253.255 |
| 63 | 10.15.254.0/24 | 10.15.254.1 – 10.15.254.254 | 10.15.254.255 |
| 64 | 10.15.255.0/24 | 10.15.255.1 – 10.15.255.254 | 10.15.255.255 |
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 /18 |
|---|---|---|---|---|
| /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 | 1 |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 2 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 4 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 8 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 16 split → |
| /23 | 255.255.254.0 | 512 | 510 | 32 split → |
| /24 | 255.255.255.0 | 256 | 254 | 64 split → |
| /25 | 255.255.255.128 | 128 | 126 | 128 split → |
| /26 | 255.255.255.192 | 64 | 62 | 256 split → |
| /27 | 255.255.255.224 | 32 | 30 | 512 split → |
| /28 | 255.255.255.240 | 16 | 14 | 1,024 split → |
| /29 | 255.255.255.248 | 8 | 6 | 2,048 split → |
| /30 | 255.255.255.252 | 4 | 2 | 4,096 split → |
| /31 | 255.255.255.254 | 2 | 2 | 8,192 split → |
| /32 | 255.255.255.255 | 1 | 1 | 16,384 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.