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)10.2.202.0/25
network10.2.202.0/25
broadcast10.2.202.127
first host10.2.202.1
last host10.2.202.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.202.0/25
address00001010.00000010.11001010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.11001010.00000000
broadcast00001010.00000010.11001010.01111111
green = network part, grey = host part
hex0x0a02ca00
decimal167954944
reverse dns0.202.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:ca00
/25 split into /31 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.2.202.0/31 | 10.2.202.0 – 10.2.202.1 | 10.2.202.1 |
| 2 | 10.2.202.2/31 | 10.2.202.2 – 10.2.202.3 | 10.2.202.3 |
| 3 | 10.2.202.4/31 | 10.2.202.4 – 10.2.202.5 | 10.2.202.5 |
| 4 | 10.2.202.6/31 | 10.2.202.6 – 10.2.202.7 | 10.2.202.7 |
| 5 | 10.2.202.8/31 | 10.2.202.8 – 10.2.202.9 | 10.2.202.9 |
| 6 | 10.2.202.10/31 | 10.2.202.10 – 10.2.202.11 | 10.2.202.11 |
| 7 | 10.2.202.12/31 | 10.2.202.12 – 10.2.202.13 | 10.2.202.13 |
| 8 | 10.2.202.14/31 | 10.2.202.14 – 10.2.202.15 | 10.2.202.15 |
| 9 | 10.2.202.16/31 | 10.2.202.16 – 10.2.202.17 | 10.2.202.17 |
| 10 | 10.2.202.18/31 | 10.2.202.18 – 10.2.202.19 | 10.2.202.19 |
| 11 | 10.2.202.20/31 | 10.2.202.20 – 10.2.202.21 | 10.2.202.21 |
| 12 | 10.2.202.22/31 | 10.2.202.22 – 10.2.202.23 | 10.2.202.23 |
| 13 | 10.2.202.24/31 | 10.2.202.24 – 10.2.202.25 | 10.2.202.25 |
| 14 | 10.2.202.26/31 | 10.2.202.26 – 10.2.202.27 | 10.2.202.27 |
| 15 | 10.2.202.28/31 | 10.2.202.28 – 10.2.202.29 | 10.2.202.29 |
| 16 | 10.2.202.30/31 | 10.2.202.30 – 10.2.202.31 | 10.2.202.31 |
| 17 | 10.2.202.32/31 | 10.2.202.32 – 10.2.202.33 | 10.2.202.33 |
| 18 | 10.2.202.34/31 | 10.2.202.34 – 10.2.202.35 | 10.2.202.35 |
| 19 | 10.2.202.36/31 | 10.2.202.36 – 10.2.202.37 | 10.2.202.37 |
| 20 | 10.2.202.38/31 | 10.2.202.38 – 10.2.202.39 | 10.2.202.39 |
| 21 | 10.2.202.40/31 | 10.2.202.40 – 10.2.202.41 | 10.2.202.41 |
| 22 | 10.2.202.42/31 | 10.2.202.42 – 10.2.202.43 | 10.2.202.43 |
| 23 | 10.2.202.44/31 | 10.2.202.44 – 10.2.202.45 | 10.2.202.45 |
| 24 | 10.2.202.46/31 | 10.2.202.46 – 10.2.202.47 | 10.2.202.47 |
| 25 | 10.2.202.48/31 | 10.2.202.48 – 10.2.202.49 | 10.2.202.49 |
| 26 | 10.2.202.50/31 | 10.2.202.50 – 10.2.202.51 | 10.2.202.51 |
| 27 | 10.2.202.52/31 | 10.2.202.52 – 10.2.202.53 | 10.2.202.53 |
| 28 | 10.2.202.54/31 | 10.2.202.54 – 10.2.202.55 | 10.2.202.55 |
| 29 | 10.2.202.56/31 | 10.2.202.56 – 10.2.202.57 | 10.2.202.57 |
| 30 | 10.2.202.58/31 | 10.2.202.58 – 10.2.202.59 | 10.2.202.59 |
| 31 | 10.2.202.60/31 | 10.2.202.60 – 10.2.202.61 | 10.2.202.61 |
| 32 | 10.2.202.62/31 | 10.2.202.62 – 10.2.202.63 | 10.2.202.63 |
| 33 | 10.2.202.64/31 | 10.2.202.64 – 10.2.202.65 | 10.2.202.65 |
| 34 | 10.2.202.66/31 | 10.2.202.66 – 10.2.202.67 | 10.2.202.67 |
| 35 | 10.2.202.68/31 | 10.2.202.68 – 10.2.202.69 | 10.2.202.69 |
| 36 | 10.2.202.70/31 | 10.2.202.70 – 10.2.202.71 | 10.2.202.71 |
| 37 | 10.2.202.72/31 | 10.2.202.72 – 10.2.202.73 | 10.2.202.73 |
| 38 | 10.2.202.74/31 | 10.2.202.74 – 10.2.202.75 | 10.2.202.75 |
| 39 | 10.2.202.76/31 | 10.2.202.76 – 10.2.202.77 | 10.2.202.77 |
| 40 | 10.2.202.78/31 | 10.2.202.78 – 10.2.202.79 | 10.2.202.79 |
| 41 | 10.2.202.80/31 | 10.2.202.80 – 10.2.202.81 | 10.2.202.81 |
| 42 | 10.2.202.82/31 | 10.2.202.82 – 10.2.202.83 | 10.2.202.83 |
| 43 | 10.2.202.84/31 | 10.2.202.84 – 10.2.202.85 | 10.2.202.85 |
| 44 | 10.2.202.86/31 | 10.2.202.86 – 10.2.202.87 | 10.2.202.87 |
| 45 | 10.2.202.88/31 | 10.2.202.88 – 10.2.202.89 | 10.2.202.89 |
| 46 | 10.2.202.90/31 | 10.2.202.90 – 10.2.202.91 | 10.2.202.91 |
| 47 | 10.2.202.92/31 | 10.2.202.92 – 10.2.202.93 | 10.2.202.93 |
| 48 | 10.2.202.94/31 | 10.2.202.94 – 10.2.202.95 | 10.2.202.95 |
| 49 | 10.2.202.96/31 | 10.2.202.96 – 10.2.202.97 | 10.2.202.97 |
| 50 | 10.2.202.98/31 | 10.2.202.98 – 10.2.202.99 | 10.2.202.99 |
| 51 | 10.2.202.100/31 | 10.2.202.100 – 10.2.202.101 | 10.2.202.101 |
| 52 | 10.2.202.102/31 | 10.2.202.102 – 10.2.202.103 | 10.2.202.103 |
| 53 | 10.2.202.104/31 | 10.2.202.104 – 10.2.202.105 | 10.2.202.105 |
| 54 | 10.2.202.106/31 | 10.2.202.106 – 10.2.202.107 | 10.2.202.107 |
| 55 | 10.2.202.108/31 | 10.2.202.108 – 10.2.202.109 | 10.2.202.109 |
| 56 | 10.2.202.110/31 | 10.2.202.110 – 10.2.202.111 | 10.2.202.111 |
| 57 | 10.2.202.112/31 | 10.2.202.112 – 10.2.202.113 | 10.2.202.113 |
| 58 | 10.2.202.114/31 | 10.2.202.114 – 10.2.202.115 | 10.2.202.115 |
| 59 | 10.2.202.116/31 | 10.2.202.116 – 10.2.202.117 | 10.2.202.117 |
| 60 | 10.2.202.118/31 | 10.2.202.118 – 10.2.202.119 | 10.2.202.119 |
| 61 | 10.2.202.120/31 | 10.2.202.120 – 10.2.202.121 | 10.2.202.121 |
| 62 | 10.2.202.122/31 | 10.2.202.122 – 10.2.202.123 | 10.2.202.123 |
| 63 | 10.2.202.124/31 | 10.2.202.124 – 10.2.202.125 | 10.2.202.125 |
| 64 | 10.2.202.126/31 | 10.2.202.126 – 10.2.202.127 | 10.2.202.127 |
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.