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)10.9.239.0/25
network10.9.239.0/25
broadcast10.9.239.127
first host10.9.239.1
last host10.9.239.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.9.239.0/25
address00001010.00001001.11101111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00001001.11101111.00000000
broadcast00001010.00001001.11101111.01111111
green = network part, grey = host part
hex0x0a09ef00
decimal168423168
reverse dns0.239.9.10.in-addr.arpa
ipv4-mapped::ffff:a09:ef00
/25 split into /30 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.9.239.0/30 | 10.9.239.1 – 10.9.239.2 | 10.9.239.3 |
| 2 | 10.9.239.4/30 | 10.9.239.5 – 10.9.239.6 | 10.9.239.7 |
| 3 | 10.9.239.8/30 | 10.9.239.9 – 10.9.239.10 | 10.9.239.11 |
| 4 | 10.9.239.12/30 | 10.9.239.13 – 10.9.239.14 | 10.9.239.15 |
| 5 | 10.9.239.16/30 | 10.9.239.17 – 10.9.239.18 | 10.9.239.19 |
| 6 | 10.9.239.20/30 | 10.9.239.21 – 10.9.239.22 | 10.9.239.23 |
| 7 | 10.9.239.24/30 | 10.9.239.25 – 10.9.239.26 | 10.9.239.27 |
| 8 | 10.9.239.28/30 | 10.9.239.29 – 10.9.239.30 | 10.9.239.31 |
| 9 | 10.9.239.32/30 | 10.9.239.33 – 10.9.239.34 | 10.9.239.35 |
| 10 | 10.9.239.36/30 | 10.9.239.37 – 10.9.239.38 | 10.9.239.39 |
| 11 | 10.9.239.40/30 | 10.9.239.41 – 10.9.239.42 | 10.9.239.43 |
| 12 | 10.9.239.44/30 | 10.9.239.45 – 10.9.239.46 | 10.9.239.47 |
| 13 | 10.9.239.48/30 | 10.9.239.49 – 10.9.239.50 | 10.9.239.51 |
| 14 | 10.9.239.52/30 | 10.9.239.53 – 10.9.239.54 | 10.9.239.55 |
| 15 | 10.9.239.56/30 | 10.9.239.57 – 10.9.239.58 | 10.9.239.59 |
| 16 | 10.9.239.60/30 | 10.9.239.61 – 10.9.239.62 | 10.9.239.63 |
| 17 | 10.9.239.64/30 | 10.9.239.65 – 10.9.239.66 | 10.9.239.67 |
| 18 | 10.9.239.68/30 | 10.9.239.69 – 10.9.239.70 | 10.9.239.71 |
| 19 | 10.9.239.72/30 | 10.9.239.73 – 10.9.239.74 | 10.9.239.75 |
| 20 | 10.9.239.76/30 | 10.9.239.77 – 10.9.239.78 | 10.9.239.79 |
| 21 | 10.9.239.80/30 | 10.9.239.81 – 10.9.239.82 | 10.9.239.83 |
| 22 | 10.9.239.84/30 | 10.9.239.85 – 10.9.239.86 | 10.9.239.87 |
| 23 | 10.9.239.88/30 | 10.9.239.89 – 10.9.239.90 | 10.9.239.91 |
| 24 | 10.9.239.92/30 | 10.9.239.93 – 10.9.239.94 | 10.9.239.95 |
| 25 | 10.9.239.96/30 | 10.9.239.97 – 10.9.239.98 | 10.9.239.99 |
| 26 | 10.9.239.100/30 | 10.9.239.101 – 10.9.239.102 | 10.9.239.103 |
| 27 | 10.9.239.104/30 | 10.9.239.105 – 10.9.239.106 | 10.9.239.107 |
| 28 | 10.9.239.108/30 | 10.9.239.109 – 10.9.239.110 | 10.9.239.111 |
| 29 | 10.9.239.112/30 | 10.9.239.113 – 10.9.239.114 | 10.9.239.115 |
| 30 | 10.9.239.116/30 | 10.9.239.117 – 10.9.239.118 | 10.9.239.119 |
| 31 | 10.9.239.120/30 | 10.9.239.121 – 10.9.239.122 | 10.9.239.123 |
| 32 | 10.9.239.124/30 | 10.9.239.125 – 10.9.239.126 | 10.9.239.127 |
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 /25 |
|---|---|---|---|---|
| /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 | - |
| /21 | 255.255.248.0 | 2,048 | 2,046 | - |
| /22 | 255.255.252.0 | 1,024 | 1,022 | - |
| /23 | 255.255.254.0 | 512 | 510 | - |
| /24 | 255.255.255.0 | 256 | 254 | - |
| /25 | 255.255.255.128 | 128 | 126 | 1 |
| /26 | 255.255.255.192 | 64 | 62 | 2 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32 split → |
| /31 | 255.255.255.254 | 2 | 2 | 64 split → |
| /32 | 255.255.255.255 | 1 | 1 | 128 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.