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)10.166.68.0/23
network10.166.68.0/23
broadcast10.166.69.255
first host10.166.68.1
last host10.166.69.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.166.68.0/23
address00001010.10100110.01000100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10100110.01000100.00000000
broadcast00001010.10100110.01000101.11111111
green = network part, grey = host part
hex0x0aa64400
decimal178668544
reverse dns0.68.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:4400
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.166.68.0/30 | 10.166.68.1 – 10.166.68.2 | 10.166.68.3 |
| 2 | 10.166.68.4/30 | 10.166.68.5 – 10.166.68.6 | 10.166.68.7 |
| 3 | 10.166.68.8/30 | 10.166.68.9 – 10.166.68.10 | 10.166.68.11 |
| 4 | 10.166.68.12/30 | 10.166.68.13 – 10.166.68.14 | 10.166.68.15 |
| 5 | 10.166.68.16/30 | 10.166.68.17 – 10.166.68.18 | 10.166.68.19 |
| 6 | 10.166.68.20/30 | 10.166.68.21 – 10.166.68.22 | 10.166.68.23 |
| 7 | 10.166.68.24/30 | 10.166.68.25 – 10.166.68.26 | 10.166.68.27 |
| 8 | 10.166.68.28/30 | 10.166.68.29 – 10.166.68.30 | 10.166.68.31 |
| 9 | 10.166.68.32/30 | 10.166.68.33 – 10.166.68.34 | 10.166.68.35 |
| 10 | 10.166.68.36/30 | 10.166.68.37 – 10.166.68.38 | 10.166.68.39 |
| 11 | 10.166.68.40/30 | 10.166.68.41 – 10.166.68.42 | 10.166.68.43 |
| 12 | 10.166.68.44/30 | 10.166.68.45 – 10.166.68.46 | 10.166.68.47 |
| 13 | 10.166.68.48/30 | 10.166.68.49 – 10.166.68.50 | 10.166.68.51 |
| 14 | 10.166.68.52/30 | 10.166.68.53 – 10.166.68.54 | 10.166.68.55 |
| 15 | 10.166.68.56/30 | 10.166.68.57 – 10.166.68.58 | 10.166.68.59 |
| 16 | 10.166.68.60/30 | 10.166.68.61 – 10.166.68.62 | 10.166.68.63 |
| 17 | 10.166.68.64/30 | 10.166.68.65 – 10.166.68.66 | 10.166.68.67 |
| 18 | 10.166.68.68/30 | 10.166.68.69 – 10.166.68.70 | 10.166.68.71 |
| 19 | 10.166.68.72/30 | 10.166.68.73 – 10.166.68.74 | 10.166.68.75 |
| 20 | 10.166.68.76/30 | 10.166.68.77 – 10.166.68.78 | 10.166.68.79 |
| 21 | 10.166.68.80/30 | 10.166.68.81 – 10.166.68.82 | 10.166.68.83 |
| 22 | 10.166.68.84/30 | 10.166.68.85 – 10.166.68.86 | 10.166.68.87 |
| 23 | 10.166.68.88/30 | 10.166.68.89 – 10.166.68.90 | 10.166.68.91 |
| 24 | 10.166.68.92/30 | 10.166.68.93 – 10.166.68.94 | 10.166.68.95 |
| 25 | 10.166.68.96/30 | 10.166.68.97 – 10.166.68.98 | 10.166.68.99 |
| 26 | 10.166.68.100/30 | 10.166.68.101 – 10.166.68.102 | 10.166.68.103 |
| 27 | 10.166.68.104/30 | 10.166.68.105 – 10.166.68.106 | 10.166.68.107 |
| 28 | 10.166.68.108/30 | 10.166.68.109 – 10.166.68.110 | 10.166.68.111 |
| 29 | 10.166.68.112/30 | 10.166.68.113 – 10.166.68.114 | 10.166.68.115 |
| 30 | 10.166.68.116/30 | 10.166.68.117 – 10.166.68.118 | 10.166.68.119 |
| 31 | 10.166.68.120/30 | 10.166.68.121 – 10.166.68.122 | 10.166.68.123 |
| 32 | 10.166.68.124/30 | 10.166.68.125 – 10.166.68.126 | 10.166.68.127 |
| 33 | 10.166.68.128/30 | 10.166.68.129 – 10.166.68.130 | 10.166.68.131 |
| 34 | 10.166.68.132/30 | 10.166.68.133 – 10.166.68.134 | 10.166.68.135 |
| 35 | 10.166.68.136/30 | 10.166.68.137 – 10.166.68.138 | 10.166.68.139 |
| 36 | 10.166.68.140/30 | 10.166.68.141 – 10.166.68.142 | 10.166.68.143 |
| 37 | 10.166.68.144/30 | 10.166.68.145 – 10.166.68.146 | 10.166.68.147 |
| 38 | 10.166.68.148/30 | 10.166.68.149 – 10.166.68.150 | 10.166.68.151 |
| 39 | 10.166.68.152/30 | 10.166.68.153 – 10.166.68.154 | 10.166.68.155 |
| 40 | 10.166.68.156/30 | 10.166.68.157 – 10.166.68.158 | 10.166.68.159 |
| 41 | 10.166.68.160/30 | 10.166.68.161 – 10.166.68.162 | 10.166.68.163 |
| 42 | 10.166.68.164/30 | 10.166.68.165 – 10.166.68.166 | 10.166.68.167 |
| 43 | 10.166.68.168/30 | 10.166.68.169 – 10.166.68.170 | 10.166.68.171 |
| 44 | 10.166.68.172/30 | 10.166.68.173 – 10.166.68.174 | 10.166.68.175 |
| 45 | 10.166.68.176/30 | 10.166.68.177 – 10.166.68.178 | 10.166.68.179 |
| 46 | 10.166.68.180/30 | 10.166.68.181 – 10.166.68.182 | 10.166.68.183 |
| 47 | 10.166.68.184/30 | 10.166.68.185 – 10.166.68.186 | 10.166.68.187 |
| 48 | 10.166.68.188/30 | 10.166.68.189 – 10.166.68.190 | 10.166.68.191 |
| 49 | 10.166.68.192/30 | 10.166.68.193 – 10.166.68.194 | 10.166.68.195 |
| 50 | 10.166.68.196/30 | 10.166.68.197 – 10.166.68.198 | 10.166.68.199 |
| 51 | 10.166.68.200/30 | 10.166.68.201 – 10.166.68.202 | 10.166.68.203 |
| 52 | 10.166.68.204/30 | 10.166.68.205 – 10.166.68.206 | 10.166.68.207 |
| 53 | 10.166.68.208/30 | 10.166.68.209 – 10.166.68.210 | 10.166.68.211 |
| 54 | 10.166.68.212/30 | 10.166.68.213 – 10.166.68.214 | 10.166.68.215 |
| 55 | 10.166.68.216/30 | 10.166.68.217 – 10.166.68.218 | 10.166.68.219 |
| 56 | 10.166.68.220/30 | 10.166.68.221 – 10.166.68.222 | 10.166.68.223 |
| 57 | 10.166.68.224/30 | 10.166.68.225 – 10.166.68.226 | 10.166.68.227 |
| 58 | 10.166.68.228/30 | 10.166.68.229 – 10.166.68.230 | 10.166.68.231 |
| 59 | 10.166.68.232/30 | 10.166.68.233 – 10.166.68.234 | 10.166.68.235 |
| 60 | 10.166.68.236/30 | 10.166.68.237 – 10.166.68.238 | 10.166.68.239 |
| 61 | 10.166.68.240/30 | 10.166.68.241 – 10.166.68.242 | 10.166.68.243 |
| 62 | 10.166.68.244/30 | 10.166.68.245 – 10.166.68.246 | 10.166.68.247 |
| 63 | 10.166.68.248/30 | 10.166.68.249 – 10.166.68.250 | 10.166.68.251 |
| 64 | 10.166.68.252/30 | 10.166.68.253 – 10.166.68.254 | 10.166.68.255 |
| 65 | 10.166.69.0/30 | 10.166.69.1 – 10.166.69.2 | 10.166.69.3 |
| 66 | 10.166.69.4/30 | 10.166.69.5 – 10.166.69.6 | 10.166.69.7 |
| 67 | 10.166.69.8/30 | 10.166.69.9 – 10.166.69.10 | 10.166.69.11 |
| 68 | 10.166.69.12/30 | 10.166.69.13 – 10.166.69.14 | 10.166.69.15 |
| 69 | 10.166.69.16/30 | 10.166.69.17 – 10.166.69.18 | 10.166.69.19 |
| 70 | 10.166.69.20/30 | 10.166.69.21 – 10.166.69.22 | 10.166.69.23 |
| 71 | 10.166.69.24/30 | 10.166.69.25 – 10.166.69.26 | 10.166.69.27 |
| 72 | 10.166.69.28/30 | 10.166.69.29 – 10.166.69.30 | 10.166.69.31 |
| 73 | 10.166.69.32/30 | 10.166.69.33 – 10.166.69.34 | 10.166.69.35 |
| 74 | 10.166.69.36/30 | 10.166.69.37 – 10.166.69.38 | 10.166.69.39 |
| 75 | 10.166.69.40/30 | 10.166.69.41 – 10.166.69.42 | 10.166.69.43 |
| 76 | 10.166.69.44/30 | 10.166.69.45 – 10.166.69.46 | 10.166.69.47 |
| 77 | 10.166.69.48/30 | 10.166.69.49 – 10.166.69.50 | 10.166.69.51 |
| 78 | 10.166.69.52/30 | 10.166.69.53 – 10.166.69.54 | 10.166.69.55 |
| 79 | 10.166.69.56/30 | 10.166.69.57 – 10.166.69.58 | 10.166.69.59 |
| 80 | 10.166.69.60/30 | 10.166.69.61 – 10.166.69.62 | 10.166.69.63 |
| 81 | 10.166.69.64/30 | 10.166.69.65 – 10.166.69.66 | 10.166.69.67 |
| 82 | 10.166.69.68/30 | 10.166.69.69 – 10.166.69.70 | 10.166.69.71 |
| 83 | 10.166.69.72/30 | 10.166.69.73 – 10.166.69.74 | 10.166.69.75 |
| 84 | 10.166.69.76/30 | 10.166.69.77 – 10.166.69.78 | 10.166.69.79 |
| 85 | 10.166.69.80/30 | 10.166.69.81 – 10.166.69.82 | 10.166.69.83 |
| 86 | 10.166.69.84/30 | 10.166.69.85 – 10.166.69.86 | 10.166.69.87 |
| 87 | 10.166.69.88/30 | 10.166.69.89 – 10.166.69.90 | 10.166.69.91 |
| 88 | 10.166.69.92/30 | 10.166.69.93 – 10.166.69.94 | 10.166.69.95 |
| 89 | 10.166.69.96/30 | 10.166.69.97 – 10.166.69.98 | 10.166.69.99 |
| 90 | 10.166.69.100/30 | 10.166.69.101 – 10.166.69.102 | 10.166.69.103 |
| 91 | 10.166.69.104/30 | 10.166.69.105 – 10.166.69.106 | 10.166.69.107 |
| 92 | 10.166.69.108/30 | 10.166.69.109 – 10.166.69.110 | 10.166.69.111 |
| 93 | 10.166.69.112/30 | 10.166.69.113 – 10.166.69.114 | 10.166.69.115 |
| 94 | 10.166.69.116/30 | 10.166.69.117 – 10.166.69.118 | 10.166.69.119 |
| 95 | 10.166.69.120/30 | 10.166.69.121 – 10.166.69.122 | 10.166.69.123 |
| 96 | 10.166.69.124/30 | 10.166.69.125 – 10.166.69.126 | 10.166.69.127 |
| 97 | 10.166.69.128/30 | 10.166.69.129 – 10.166.69.130 | 10.166.69.131 |
| 98 | 10.166.69.132/30 | 10.166.69.133 – 10.166.69.134 | 10.166.69.135 |
| 99 | 10.166.69.136/30 | 10.166.69.137 – 10.166.69.138 | 10.166.69.139 |
| 100 | 10.166.69.140/30 | 10.166.69.141 – 10.166.69.142 | 10.166.69.143 |
| 101 | 10.166.69.144/30 | 10.166.69.145 – 10.166.69.146 | 10.166.69.147 |
| 102 | 10.166.69.148/30 | 10.166.69.149 – 10.166.69.150 | 10.166.69.151 |
| 103 | 10.166.69.152/30 | 10.166.69.153 – 10.166.69.154 | 10.166.69.155 |
| 104 | 10.166.69.156/30 | 10.166.69.157 – 10.166.69.158 | 10.166.69.159 |
| 105 | 10.166.69.160/30 | 10.166.69.161 – 10.166.69.162 | 10.166.69.163 |
| 106 | 10.166.69.164/30 | 10.166.69.165 – 10.166.69.166 | 10.166.69.167 |
| 107 | 10.166.69.168/30 | 10.166.69.169 – 10.166.69.170 | 10.166.69.171 |
| 108 | 10.166.69.172/30 | 10.166.69.173 – 10.166.69.174 | 10.166.69.175 |
| 109 | 10.166.69.176/30 | 10.166.69.177 – 10.166.69.178 | 10.166.69.179 |
| 110 | 10.166.69.180/30 | 10.166.69.181 – 10.166.69.182 | 10.166.69.183 |
| 111 | 10.166.69.184/30 | 10.166.69.185 – 10.166.69.186 | 10.166.69.187 |
| 112 | 10.166.69.188/30 | 10.166.69.189 – 10.166.69.190 | 10.166.69.191 |
| 113 | 10.166.69.192/30 | 10.166.69.193 – 10.166.69.194 | 10.166.69.195 |
| 114 | 10.166.69.196/30 | 10.166.69.197 – 10.166.69.198 | 10.166.69.199 |
| 115 | 10.166.69.200/30 | 10.166.69.201 – 10.166.69.202 | 10.166.69.203 |
| 116 | 10.166.69.204/30 | 10.166.69.205 – 10.166.69.206 | 10.166.69.207 |
| 117 | 10.166.69.208/30 | 10.166.69.209 – 10.166.69.210 | 10.166.69.211 |
| 118 | 10.166.69.212/30 | 10.166.69.213 – 10.166.69.214 | 10.166.69.215 |
| 119 | 10.166.69.216/30 | 10.166.69.217 – 10.166.69.218 | 10.166.69.219 |
| 120 | 10.166.69.220/30 | 10.166.69.221 – 10.166.69.222 | 10.166.69.223 |
| 121 | 10.166.69.224/30 | 10.166.69.225 – 10.166.69.226 | 10.166.69.227 |
| 122 | 10.166.69.228/30 | 10.166.69.229 – 10.166.69.230 | 10.166.69.231 |
| 123 | 10.166.69.232/30 | 10.166.69.233 – 10.166.69.234 | 10.166.69.235 |
| 124 | 10.166.69.236/30 | 10.166.69.237 – 10.166.69.238 | 10.166.69.239 |
| 125 | 10.166.69.240/30 | 10.166.69.241 – 10.166.69.242 | 10.166.69.243 |
| 126 | 10.166.69.244/30 | 10.166.69.245 – 10.166.69.246 | 10.166.69.247 |
| 127 | 10.166.69.248/30 | 10.166.69.249 – 10.166.69.250 | 10.166.69.251 |
| 128 | 10.166.69.252/30 | 10.166.69.253 – 10.166.69.254 | 10.166.69.255 |
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.