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)10.239.2.0/23
network10.239.2.0/23
broadcast10.239.3.255
first host10.239.2.1
last host10.239.3.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.239.2.0/23
address00001010.11101111.00000010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11101111.00000010.00000000
broadcast00001010.11101111.00000011.11111111
green = network part, grey = host part
hex0x0aef0200
decimal183435776
reverse dns0.2.239.10.in-addr.arpa
ipv4-mapped::ffff:aef:200
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.239.2.0/30 | 10.239.2.1 – 10.239.2.2 | 10.239.2.3 |
| 2 | 10.239.2.4/30 | 10.239.2.5 – 10.239.2.6 | 10.239.2.7 |
| 3 | 10.239.2.8/30 | 10.239.2.9 – 10.239.2.10 | 10.239.2.11 |
| 4 | 10.239.2.12/30 | 10.239.2.13 – 10.239.2.14 | 10.239.2.15 |
| 5 | 10.239.2.16/30 | 10.239.2.17 – 10.239.2.18 | 10.239.2.19 |
| 6 | 10.239.2.20/30 | 10.239.2.21 – 10.239.2.22 | 10.239.2.23 |
| 7 | 10.239.2.24/30 | 10.239.2.25 – 10.239.2.26 | 10.239.2.27 |
| 8 | 10.239.2.28/30 | 10.239.2.29 – 10.239.2.30 | 10.239.2.31 |
| 9 | 10.239.2.32/30 | 10.239.2.33 – 10.239.2.34 | 10.239.2.35 |
| 10 | 10.239.2.36/30 | 10.239.2.37 – 10.239.2.38 | 10.239.2.39 |
| 11 | 10.239.2.40/30 | 10.239.2.41 – 10.239.2.42 | 10.239.2.43 |
| 12 | 10.239.2.44/30 | 10.239.2.45 – 10.239.2.46 | 10.239.2.47 |
| 13 | 10.239.2.48/30 | 10.239.2.49 – 10.239.2.50 | 10.239.2.51 |
| 14 | 10.239.2.52/30 | 10.239.2.53 – 10.239.2.54 | 10.239.2.55 |
| 15 | 10.239.2.56/30 | 10.239.2.57 – 10.239.2.58 | 10.239.2.59 |
| 16 | 10.239.2.60/30 | 10.239.2.61 – 10.239.2.62 | 10.239.2.63 |
| 17 | 10.239.2.64/30 | 10.239.2.65 – 10.239.2.66 | 10.239.2.67 |
| 18 | 10.239.2.68/30 | 10.239.2.69 – 10.239.2.70 | 10.239.2.71 |
| 19 | 10.239.2.72/30 | 10.239.2.73 – 10.239.2.74 | 10.239.2.75 |
| 20 | 10.239.2.76/30 | 10.239.2.77 – 10.239.2.78 | 10.239.2.79 |
| 21 | 10.239.2.80/30 | 10.239.2.81 – 10.239.2.82 | 10.239.2.83 |
| 22 | 10.239.2.84/30 | 10.239.2.85 – 10.239.2.86 | 10.239.2.87 |
| 23 | 10.239.2.88/30 | 10.239.2.89 – 10.239.2.90 | 10.239.2.91 |
| 24 | 10.239.2.92/30 | 10.239.2.93 – 10.239.2.94 | 10.239.2.95 |
| 25 | 10.239.2.96/30 | 10.239.2.97 – 10.239.2.98 | 10.239.2.99 |
| 26 | 10.239.2.100/30 | 10.239.2.101 – 10.239.2.102 | 10.239.2.103 |
| 27 | 10.239.2.104/30 | 10.239.2.105 – 10.239.2.106 | 10.239.2.107 |
| 28 | 10.239.2.108/30 | 10.239.2.109 – 10.239.2.110 | 10.239.2.111 |
| 29 | 10.239.2.112/30 | 10.239.2.113 – 10.239.2.114 | 10.239.2.115 |
| 30 | 10.239.2.116/30 | 10.239.2.117 – 10.239.2.118 | 10.239.2.119 |
| 31 | 10.239.2.120/30 | 10.239.2.121 – 10.239.2.122 | 10.239.2.123 |
| 32 | 10.239.2.124/30 | 10.239.2.125 – 10.239.2.126 | 10.239.2.127 |
| 33 | 10.239.2.128/30 | 10.239.2.129 – 10.239.2.130 | 10.239.2.131 |
| 34 | 10.239.2.132/30 | 10.239.2.133 – 10.239.2.134 | 10.239.2.135 |
| 35 | 10.239.2.136/30 | 10.239.2.137 – 10.239.2.138 | 10.239.2.139 |
| 36 | 10.239.2.140/30 | 10.239.2.141 – 10.239.2.142 | 10.239.2.143 |
| 37 | 10.239.2.144/30 | 10.239.2.145 – 10.239.2.146 | 10.239.2.147 |
| 38 | 10.239.2.148/30 | 10.239.2.149 – 10.239.2.150 | 10.239.2.151 |
| 39 | 10.239.2.152/30 | 10.239.2.153 – 10.239.2.154 | 10.239.2.155 |
| 40 | 10.239.2.156/30 | 10.239.2.157 – 10.239.2.158 | 10.239.2.159 |
| 41 | 10.239.2.160/30 | 10.239.2.161 – 10.239.2.162 | 10.239.2.163 |
| 42 | 10.239.2.164/30 | 10.239.2.165 – 10.239.2.166 | 10.239.2.167 |
| 43 | 10.239.2.168/30 | 10.239.2.169 – 10.239.2.170 | 10.239.2.171 |
| 44 | 10.239.2.172/30 | 10.239.2.173 – 10.239.2.174 | 10.239.2.175 |
| 45 | 10.239.2.176/30 | 10.239.2.177 – 10.239.2.178 | 10.239.2.179 |
| 46 | 10.239.2.180/30 | 10.239.2.181 – 10.239.2.182 | 10.239.2.183 |
| 47 | 10.239.2.184/30 | 10.239.2.185 – 10.239.2.186 | 10.239.2.187 |
| 48 | 10.239.2.188/30 | 10.239.2.189 – 10.239.2.190 | 10.239.2.191 |
| 49 | 10.239.2.192/30 | 10.239.2.193 – 10.239.2.194 | 10.239.2.195 |
| 50 | 10.239.2.196/30 | 10.239.2.197 – 10.239.2.198 | 10.239.2.199 |
| 51 | 10.239.2.200/30 | 10.239.2.201 – 10.239.2.202 | 10.239.2.203 |
| 52 | 10.239.2.204/30 | 10.239.2.205 – 10.239.2.206 | 10.239.2.207 |
| 53 | 10.239.2.208/30 | 10.239.2.209 – 10.239.2.210 | 10.239.2.211 |
| 54 | 10.239.2.212/30 | 10.239.2.213 – 10.239.2.214 | 10.239.2.215 |
| 55 | 10.239.2.216/30 | 10.239.2.217 – 10.239.2.218 | 10.239.2.219 |
| 56 | 10.239.2.220/30 | 10.239.2.221 – 10.239.2.222 | 10.239.2.223 |
| 57 | 10.239.2.224/30 | 10.239.2.225 – 10.239.2.226 | 10.239.2.227 |
| 58 | 10.239.2.228/30 | 10.239.2.229 – 10.239.2.230 | 10.239.2.231 |
| 59 | 10.239.2.232/30 | 10.239.2.233 – 10.239.2.234 | 10.239.2.235 |
| 60 | 10.239.2.236/30 | 10.239.2.237 – 10.239.2.238 | 10.239.2.239 |
| 61 | 10.239.2.240/30 | 10.239.2.241 – 10.239.2.242 | 10.239.2.243 |
| 62 | 10.239.2.244/30 | 10.239.2.245 – 10.239.2.246 | 10.239.2.247 |
| 63 | 10.239.2.248/30 | 10.239.2.249 – 10.239.2.250 | 10.239.2.251 |
| 64 | 10.239.2.252/30 | 10.239.2.253 – 10.239.2.254 | 10.239.2.255 |
| 65 | 10.239.3.0/30 | 10.239.3.1 – 10.239.3.2 | 10.239.3.3 |
| 66 | 10.239.3.4/30 | 10.239.3.5 – 10.239.3.6 | 10.239.3.7 |
| 67 | 10.239.3.8/30 | 10.239.3.9 – 10.239.3.10 | 10.239.3.11 |
| 68 | 10.239.3.12/30 | 10.239.3.13 – 10.239.3.14 | 10.239.3.15 |
| 69 | 10.239.3.16/30 | 10.239.3.17 – 10.239.3.18 | 10.239.3.19 |
| 70 | 10.239.3.20/30 | 10.239.3.21 – 10.239.3.22 | 10.239.3.23 |
| 71 | 10.239.3.24/30 | 10.239.3.25 – 10.239.3.26 | 10.239.3.27 |
| 72 | 10.239.3.28/30 | 10.239.3.29 – 10.239.3.30 | 10.239.3.31 |
| 73 | 10.239.3.32/30 | 10.239.3.33 – 10.239.3.34 | 10.239.3.35 |
| 74 | 10.239.3.36/30 | 10.239.3.37 – 10.239.3.38 | 10.239.3.39 |
| 75 | 10.239.3.40/30 | 10.239.3.41 – 10.239.3.42 | 10.239.3.43 |
| 76 | 10.239.3.44/30 | 10.239.3.45 – 10.239.3.46 | 10.239.3.47 |
| 77 | 10.239.3.48/30 | 10.239.3.49 – 10.239.3.50 | 10.239.3.51 |
| 78 | 10.239.3.52/30 | 10.239.3.53 – 10.239.3.54 | 10.239.3.55 |
| 79 | 10.239.3.56/30 | 10.239.3.57 – 10.239.3.58 | 10.239.3.59 |
| 80 | 10.239.3.60/30 | 10.239.3.61 – 10.239.3.62 | 10.239.3.63 |
| 81 | 10.239.3.64/30 | 10.239.3.65 – 10.239.3.66 | 10.239.3.67 |
| 82 | 10.239.3.68/30 | 10.239.3.69 – 10.239.3.70 | 10.239.3.71 |
| 83 | 10.239.3.72/30 | 10.239.3.73 – 10.239.3.74 | 10.239.3.75 |
| 84 | 10.239.3.76/30 | 10.239.3.77 – 10.239.3.78 | 10.239.3.79 |
| 85 | 10.239.3.80/30 | 10.239.3.81 – 10.239.3.82 | 10.239.3.83 |
| 86 | 10.239.3.84/30 | 10.239.3.85 – 10.239.3.86 | 10.239.3.87 |
| 87 | 10.239.3.88/30 | 10.239.3.89 – 10.239.3.90 | 10.239.3.91 |
| 88 | 10.239.3.92/30 | 10.239.3.93 – 10.239.3.94 | 10.239.3.95 |
| 89 | 10.239.3.96/30 | 10.239.3.97 – 10.239.3.98 | 10.239.3.99 |
| 90 | 10.239.3.100/30 | 10.239.3.101 – 10.239.3.102 | 10.239.3.103 |
| 91 | 10.239.3.104/30 | 10.239.3.105 – 10.239.3.106 | 10.239.3.107 |
| 92 | 10.239.3.108/30 | 10.239.3.109 – 10.239.3.110 | 10.239.3.111 |
| 93 | 10.239.3.112/30 | 10.239.3.113 – 10.239.3.114 | 10.239.3.115 |
| 94 | 10.239.3.116/30 | 10.239.3.117 – 10.239.3.118 | 10.239.3.119 |
| 95 | 10.239.3.120/30 | 10.239.3.121 – 10.239.3.122 | 10.239.3.123 |
| 96 | 10.239.3.124/30 | 10.239.3.125 – 10.239.3.126 | 10.239.3.127 |
| 97 | 10.239.3.128/30 | 10.239.3.129 – 10.239.3.130 | 10.239.3.131 |
| 98 | 10.239.3.132/30 | 10.239.3.133 – 10.239.3.134 | 10.239.3.135 |
| 99 | 10.239.3.136/30 | 10.239.3.137 – 10.239.3.138 | 10.239.3.139 |
| 100 | 10.239.3.140/30 | 10.239.3.141 – 10.239.3.142 | 10.239.3.143 |
| 101 | 10.239.3.144/30 | 10.239.3.145 – 10.239.3.146 | 10.239.3.147 |
| 102 | 10.239.3.148/30 | 10.239.3.149 – 10.239.3.150 | 10.239.3.151 |
| 103 | 10.239.3.152/30 | 10.239.3.153 – 10.239.3.154 | 10.239.3.155 |
| 104 | 10.239.3.156/30 | 10.239.3.157 – 10.239.3.158 | 10.239.3.159 |
| 105 | 10.239.3.160/30 | 10.239.3.161 – 10.239.3.162 | 10.239.3.163 |
| 106 | 10.239.3.164/30 | 10.239.3.165 – 10.239.3.166 | 10.239.3.167 |
| 107 | 10.239.3.168/30 | 10.239.3.169 – 10.239.3.170 | 10.239.3.171 |
| 108 | 10.239.3.172/30 | 10.239.3.173 – 10.239.3.174 | 10.239.3.175 |
| 109 | 10.239.3.176/30 | 10.239.3.177 – 10.239.3.178 | 10.239.3.179 |
| 110 | 10.239.3.180/30 | 10.239.3.181 – 10.239.3.182 | 10.239.3.183 |
| 111 | 10.239.3.184/30 | 10.239.3.185 – 10.239.3.186 | 10.239.3.187 |
| 112 | 10.239.3.188/30 | 10.239.3.189 – 10.239.3.190 | 10.239.3.191 |
| 113 | 10.239.3.192/30 | 10.239.3.193 – 10.239.3.194 | 10.239.3.195 |
| 114 | 10.239.3.196/30 | 10.239.3.197 – 10.239.3.198 | 10.239.3.199 |
| 115 | 10.239.3.200/30 | 10.239.3.201 – 10.239.3.202 | 10.239.3.203 |
| 116 | 10.239.3.204/30 | 10.239.3.205 – 10.239.3.206 | 10.239.3.207 |
| 117 | 10.239.3.208/30 | 10.239.3.209 – 10.239.3.210 | 10.239.3.211 |
| 118 | 10.239.3.212/30 | 10.239.3.213 – 10.239.3.214 | 10.239.3.215 |
| 119 | 10.239.3.216/30 | 10.239.3.217 – 10.239.3.218 | 10.239.3.219 |
| 120 | 10.239.3.220/30 | 10.239.3.221 – 10.239.3.222 | 10.239.3.223 |
| 121 | 10.239.3.224/30 | 10.239.3.225 – 10.239.3.226 | 10.239.3.227 |
| 122 | 10.239.3.228/30 | 10.239.3.229 – 10.239.3.230 | 10.239.3.231 |
| 123 | 10.239.3.232/30 | 10.239.3.233 – 10.239.3.234 | 10.239.3.235 |
| 124 | 10.239.3.236/30 | 10.239.3.237 – 10.239.3.238 | 10.239.3.239 |
| 125 | 10.239.3.240/30 | 10.239.3.241 – 10.239.3.242 | 10.239.3.243 |
| 126 | 10.239.3.244/30 | 10.239.3.245 – 10.239.3.246 | 10.239.3.247 |
| 127 | 10.239.3.248/30 | 10.239.3.249 – 10.239.3.250 | 10.239.3.251 |
| 128 | 10.239.3.252/30 | 10.239.3.253 – 10.239.3.254 | 10.239.3.255 |
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.