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)10.122.142.0/23
network10.122.142.0/23
broadcast10.122.143.255
first host10.122.142.1
last host10.122.143.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.122.142.0/23
address00001010.01111010.10001110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01111010.10001110.00000000
broadcast00001010.01111010.10001111.11111111
green = network part, grey = host part
hex0x0a7a8e00
decimal175803904
reverse dns0.142.122.10.in-addr.arpa
ipv4-mapped::ffff:a7a:8e00
/23 split into /29 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.122.142.0/29 | 10.122.142.1 – 10.122.142.6 | 10.122.142.7 |
| 2 | 10.122.142.8/29 | 10.122.142.9 – 10.122.142.14 | 10.122.142.15 |
| 3 | 10.122.142.16/29 | 10.122.142.17 – 10.122.142.22 | 10.122.142.23 |
| 4 | 10.122.142.24/29 | 10.122.142.25 – 10.122.142.30 | 10.122.142.31 |
| 5 | 10.122.142.32/29 | 10.122.142.33 – 10.122.142.38 | 10.122.142.39 |
| 6 | 10.122.142.40/29 | 10.122.142.41 – 10.122.142.46 | 10.122.142.47 |
| 7 | 10.122.142.48/29 | 10.122.142.49 – 10.122.142.54 | 10.122.142.55 |
| 8 | 10.122.142.56/29 | 10.122.142.57 – 10.122.142.62 | 10.122.142.63 |
| 9 | 10.122.142.64/29 | 10.122.142.65 – 10.122.142.70 | 10.122.142.71 |
| 10 | 10.122.142.72/29 | 10.122.142.73 – 10.122.142.78 | 10.122.142.79 |
| 11 | 10.122.142.80/29 | 10.122.142.81 – 10.122.142.86 | 10.122.142.87 |
| 12 | 10.122.142.88/29 | 10.122.142.89 – 10.122.142.94 | 10.122.142.95 |
| 13 | 10.122.142.96/29 | 10.122.142.97 – 10.122.142.102 | 10.122.142.103 |
| 14 | 10.122.142.104/29 | 10.122.142.105 – 10.122.142.110 | 10.122.142.111 |
| 15 | 10.122.142.112/29 | 10.122.142.113 – 10.122.142.118 | 10.122.142.119 |
| 16 | 10.122.142.120/29 | 10.122.142.121 – 10.122.142.126 | 10.122.142.127 |
| 17 | 10.122.142.128/29 | 10.122.142.129 – 10.122.142.134 | 10.122.142.135 |
| 18 | 10.122.142.136/29 | 10.122.142.137 – 10.122.142.142 | 10.122.142.143 |
| 19 | 10.122.142.144/29 | 10.122.142.145 – 10.122.142.150 | 10.122.142.151 |
| 20 | 10.122.142.152/29 | 10.122.142.153 – 10.122.142.158 | 10.122.142.159 |
| 21 | 10.122.142.160/29 | 10.122.142.161 – 10.122.142.166 | 10.122.142.167 |
| 22 | 10.122.142.168/29 | 10.122.142.169 – 10.122.142.174 | 10.122.142.175 |
| 23 | 10.122.142.176/29 | 10.122.142.177 – 10.122.142.182 | 10.122.142.183 |
| 24 | 10.122.142.184/29 | 10.122.142.185 – 10.122.142.190 | 10.122.142.191 |
| 25 | 10.122.142.192/29 | 10.122.142.193 – 10.122.142.198 | 10.122.142.199 |
| 26 | 10.122.142.200/29 | 10.122.142.201 – 10.122.142.206 | 10.122.142.207 |
| 27 | 10.122.142.208/29 | 10.122.142.209 – 10.122.142.214 | 10.122.142.215 |
| 28 | 10.122.142.216/29 | 10.122.142.217 – 10.122.142.222 | 10.122.142.223 |
| 29 | 10.122.142.224/29 | 10.122.142.225 – 10.122.142.230 | 10.122.142.231 |
| 30 | 10.122.142.232/29 | 10.122.142.233 – 10.122.142.238 | 10.122.142.239 |
| 31 | 10.122.142.240/29 | 10.122.142.241 – 10.122.142.246 | 10.122.142.247 |
| 32 | 10.122.142.248/29 | 10.122.142.249 – 10.122.142.254 | 10.122.142.255 |
| 33 | 10.122.143.0/29 | 10.122.143.1 – 10.122.143.6 | 10.122.143.7 |
| 34 | 10.122.143.8/29 | 10.122.143.9 – 10.122.143.14 | 10.122.143.15 |
| 35 | 10.122.143.16/29 | 10.122.143.17 – 10.122.143.22 | 10.122.143.23 |
| 36 | 10.122.143.24/29 | 10.122.143.25 – 10.122.143.30 | 10.122.143.31 |
| 37 | 10.122.143.32/29 | 10.122.143.33 – 10.122.143.38 | 10.122.143.39 |
| 38 | 10.122.143.40/29 | 10.122.143.41 – 10.122.143.46 | 10.122.143.47 |
| 39 | 10.122.143.48/29 | 10.122.143.49 – 10.122.143.54 | 10.122.143.55 |
| 40 | 10.122.143.56/29 | 10.122.143.57 – 10.122.143.62 | 10.122.143.63 |
| 41 | 10.122.143.64/29 | 10.122.143.65 – 10.122.143.70 | 10.122.143.71 |
| 42 | 10.122.143.72/29 | 10.122.143.73 – 10.122.143.78 | 10.122.143.79 |
| 43 | 10.122.143.80/29 | 10.122.143.81 – 10.122.143.86 | 10.122.143.87 |
| 44 | 10.122.143.88/29 | 10.122.143.89 – 10.122.143.94 | 10.122.143.95 |
| 45 | 10.122.143.96/29 | 10.122.143.97 – 10.122.143.102 | 10.122.143.103 |
| 46 | 10.122.143.104/29 | 10.122.143.105 – 10.122.143.110 | 10.122.143.111 |
| 47 | 10.122.143.112/29 | 10.122.143.113 – 10.122.143.118 | 10.122.143.119 |
| 48 | 10.122.143.120/29 | 10.122.143.121 – 10.122.143.126 | 10.122.143.127 |
| 49 | 10.122.143.128/29 | 10.122.143.129 – 10.122.143.134 | 10.122.143.135 |
| 50 | 10.122.143.136/29 | 10.122.143.137 – 10.122.143.142 | 10.122.143.143 |
| 51 | 10.122.143.144/29 | 10.122.143.145 – 10.122.143.150 | 10.122.143.151 |
| 52 | 10.122.143.152/29 | 10.122.143.153 – 10.122.143.158 | 10.122.143.159 |
| 53 | 10.122.143.160/29 | 10.122.143.161 – 10.122.143.166 | 10.122.143.167 |
| 54 | 10.122.143.168/29 | 10.122.143.169 – 10.122.143.174 | 10.122.143.175 |
| 55 | 10.122.143.176/29 | 10.122.143.177 – 10.122.143.182 | 10.122.143.183 |
| 56 | 10.122.143.184/29 | 10.122.143.185 – 10.122.143.190 | 10.122.143.191 |
| 57 | 10.122.143.192/29 | 10.122.143.193 – 10.122.143.198 | 10.122.143.199 |
| 58 | 10.122.143.200/29 | 10.122.143.201 – 10.122.143.206 | 10.122.143.207 |
| 59 | 10.122.143.208/29 | 10.122.143.209 – 10.122.143.214 | 10.122.143.215 |
| 60 | 10.122.143.216/29 | 10.122.143.217 – 10.122.143.222 | 10.122.143.223 |
| 61 | 10.122.143.224/29 | 10.122.143.225 – 10.122.143.230 | 10.122.143.231 |
| 62 | 10.122.143.232/29 | 10.122.143.233 – 10.122.143.238 | 10.122.143.239 |
| 63 | 10.122.143.240/29 | 10.122.143.241 – 10.122.143.246 | 10.122.143.247 |
| 64 | 10.122.143.248/29 | 10.122.143.249 – 10.122.143.254 | 10.122.143.255 |
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 /23 |
|---|---|---|---|---|
| /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 | 1 |
| /24 | 255.255.255.0 | 256 | 254 | 2 split → |
| /25 | 255.255.255.128 | 128 | 126 | 4 split → |
| /26 | 255.255.255.192 | 64 | 62 | 8 split → |
| /27 | 255.255.255.224 | 32 | 30 | 16 split → |
| /28 | 255.255.255.240 | 16 | 14 | 32 split → |
| /29 | 255.255.255.248 | 8 | 6 | 64 split → |
| /30 | 255.255.255.252 | 4 | 2 | 128 split → |
| /31 | 255.255.255.254 | 2 | 2 | 256 split → |
| /32 | 255.255.255.255 | 1 | 1 | 512 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.