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)10.167.66.0/24
network10.167.66.0/24
broadcast10.167.66.255
first host10.167.66.1
last host10.167.66.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.167.66.0/24
address00001010.10100111.01000010.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100111.01000010.00000000
broadcast00001010.10100111.01000010.11111111
green = network part, grey = host part
hex0x0aa74200
decimal178733568
reverse dns0.66.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:4200
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.167.66.0/31 | 10.167.66.0 – 10.167.66.1 | 10.167.66.1 |
| 2 | 10.167.66.2/31 | 10.167.66.2 – 10.167.66.3 | 10.167.66.3 |
| 3 | 10.167.66.4/31 | 10.167.66.4 – 10.167.66.5 | 10.167.66.5 |
| 4 | 10.167.66.6/31 | 10.167.66.6 – 10.167.66.7 | 10.167.66.7 |
| 5 | 10.167.66.8/31 | 10.167.66.8 – 10.167.66.9 | 10.167.66.9 |
| 6 | 10.167.66.10/31 | 10.167.66.10 – 10.167.66.11 | 10.167.66.11 |
| 7 | 10.167.66.12/31 | 10.167.66.12 – 10.167.66.13 | 10.167.66.13 |
| 8 | 10.167.66.14/31 | 10.167.66.14 – 10.167.66.15 | 10.167.66.15 |
| 9 | 10.167.66.16/31 | 10.167.66.16 – 10.167.66.17 | 10.167.66.17 |
| 10 | 10.167.66.18/31 | 10.167.66.18 – 10.167.66.19 | 10.167.66.19 |
| 11 | 10.167.66.20/31 | 10.167.66.20 – 10.167.66.21 | 10.167.66.21 |
| 12 | 10.167.66.22/31 | 10.167.66.22 – 10.167.66.23 | 10.167.66.23 |
| 13 | 10.167.66.24/31 | 10.167.66.24 – 10.167.66.25 | 10.167.66.25 |
| 14 | 10.167.66.26/31 | 10.167.66.26 – 10.167.66.27 | 10.167.66.27 |
| 15 | 10.167.66.28/31 | 10.167.66.28 – 10.167.66.29 | 10.167.66.29 |
| 16 | 10.167.66.30/31 | 10.167.66.30 – 10.167.66.31 | 10.167.66.31 |
| 17 | 10.167.66.32/31 | 10.167.66.32 – 10.167.66.33 | 10.167.66.33 |
| 18 | 10.167.66.34/31 | 10.167.66.34 – 10.167.66.35 | 10.167.66.35 |
| 19 | 10.167.66.36/31 | 10.167.66.36 – 10.167.66.37 | 10.167.66.37 |
| 20 | 10.167.66.38/31 | 10.167.66.38 – 10.167.66.39 | 10.167.66.39 |
| 21 | 10.167.66.40/31 | 10.167.66.40 – 10.167.66.41 | 10.167.66.41 |
| 22 | 10.167.66.42/31 | 10.167.66.42 – 10.167.66.43 | 10.167.66.43 |
| 23 | 10.167.66.44/31 | 10.167.66.44 – 10.167.66.45 | 10.167.66.45 |
| 24 | 10.167.66.46/31 | 10.167.66.46 – 10.167.66.47 | 10.167.66.47 |
| 25 | 10.167.66.48/31 | 10.167.66.48 – 10.167.66.49 | 10.167.66.49 |
| 26 | 10.167.66.50/31 | 10.167.66.50 – 10.167.66.51 | 10.167.66.51 |
| 27 | 10.167.66.52/31 | 10.167.66.52 – 10.167.66.53 | 10.167.66.53 |
| 28 | 10.167.66.54/31 | 10.167.66.54 – 10.167.66.55 | 10.167.66.55 |
| 29 | 10.167.66.56/31 | 10.167.66.56 – 10.167.66.57 | 10.167.66.57 |
| 30 | 10.167.66.58/31 | 10.167.66.58 – 10.167.66.59 | 10.167.66.59 |
| 31 | 10.167.66.60/31 | 10.167.66.60 – 10.167.66.61 | 10.167.66.61 |
| 32 | 10.167.66.62/31 | 10.167.66.62 – 10.167.66.63 | 10.167.66.63 |
| 33 | 10.167.66.64/31 | 10.167.66.64 – 10.167.66.65 | 10.167.66.65 |
| 34 | 10.167.66.66/31 | 10.167.66.66 – 10.167.66.67 | 10.167.66.67 |
| 35 | 10.167.66.68/31 | 10.167.66.68 – 10.167.66.69 | 10.167.66.69 |
| 36 | 10.167.66.70/31 | 10.167.66.70 – 10.167.66.71 | 10.167.66.71 |
| 37 | 10.167.66.72/31 | 10.167.66.72 – 10.167.66.73 | 10.167.66.73 |
| 38 | 10.167.66.74/31 | 10.167.66.74 – 10.167.66.75 | 10.167.66.75 |
| 39 | 10.167.66.76/31 | 10.167.66.76 – 10.167.66.77 | 10.167.66.77 |
| 40 | 10.167.66.78/31 | 10.167.66.78 – 10.167.66.79 | 10.167.66.79 |
| 41 | 10.167.66.80/31 | 10.167.66.80 – 10.167.66.81 | 10.167.66.81 |
| 42 | 10.167.66.82/31 | 10.167.66.82 – 10.167.66.83 | 10.167.66.83 |
| 43 | 10.167.66.84/31 | 10.167.66.84 – 10.167.66.85 | 10.167.66.85 |
| 44 | 10.167.66.86/31 | 10.167.66.86 – 10.167.66.87 | 10.167.66.87 |
| 45 | 10.167.66.88/31 | 10.167.66.88 – 10.167.66.89 | 10.167.66.89 |
| 46 | 10.167.66.90/31 | 10.167.66.90 – 10.167.66.91 | 10.167.66.91 |
| 47 | 10.167.66.92/31 | 10.167.66.92 – 10.167.66.93 | 10.167.66.93 |
| 48 | 10.167.66.94/31 | 10.167.66.94 – 10.167.66.95 | 10.167.66.95 |
| 49 | 10.167.66.96/31 | 10.167.66.96 – 10.167.66.97 | 10.167.66.97 |
| 50 | 10.167.66.98/31 | 10.167.66.98 – 10.167.66.99 | 10.167.66.99 |
| 51 | 10.167.66.100/31 | 10.167.66.100 – 10.167.66.101 | 10.167.66.101 |
| 52 | 10.167.66.102/31 | 10.167.66.102 – 10.167.66.103 | 10.167.66.103 |
| 53 | 10.167.66.104/31 | 10.167.66.104 – 10.167.66.105 | 10.167.66.105 |
| 54 | 10.167.66.106/31 | 10.167.66.106 – 10.167.66.107 | 10.167.66.107 |
| 55 | 10.167.66.108/31 | 10.167.66.108 – 10.167.66.109 | 10.167.66.109 |
| 56 | 10.167.66.110/31 | 10.167.66.110 – 10.167.66.111 | 10.167.66.111 |
| 57 | 10.167.66.112/31 | 10.167.66.112 – 10.167.66.113 | 10.167.66.113 |
| 58 | 10.167.66.114/31 | 10.167.66.114 – 10.167.66.115 | 10.167.66.115 |
| 59 | 10.167.66.116/31 | 10.167.66.116 – 10.167.66.117 | 10.167.66.117 |
| 60 | 10.167.66.118/31 | 10.167.66.118 – 10.167.66.119 | 10.167.66.119 |
| 61 | 10.167.66.120/31 | 10.167.66.120 – 10.167.66.121 | 10.167.66.121 |
| 62 | 10.167.66.122/31 | 10.167.66.122 – 10.167.66.123 | 10.167.66.123 |
| 63 | 10.167.66.124/31 | 10.167.66.124 – 10.167.66.125 | 10.167.66.125 |
| 64 | 10.167.66.126/31 | 10.167.66.126 – 10.167.66.127 | 10.167.66.127 |
| 65 | 10.167.66.128/31 | 10.167.66.128 – 10.167.66.129 | 10.167.66.129 |
| 66 | 10.167.66.130/31 | 10.167.66.130 – 10.167.66.131 | 10.167.66.131 |
| 67 | 10.167.66.132/31 | 10.167.66.132 – 10.167.66.133 | 10.167.66.133 |
| 68 | 10.167.66.134/31 | 10.167.66.134 – 10.167.66.135 | 10.167.66.135 |
| 69 | 10.167.66.136/31 | 10.167.66.136 – 10.167.66.137 | 10.167.66.137 |
| 70 | 10.167.66.138/31 | 10.167.66.138 – 10.167.66.139 | 10.167.66.139 |
| 71 | 10.167.66.140/31 | 10.167.66.140 – 10.167.66.141 | 10.167.66.141 |
| 72 | 10.167.66.142/31 | 10.167.66.142 – 10.167.66.143 | 10.167.66.143 |
| 73 | 10.167.66.144/31 | 10.167.66.144 – 10.167.66.145 | 10.167.66.145 |
| 74 | 10.167.66.146/31 | 10.167.66.146 – 10.167.66.147 | 10.167.66.147 |
| 75 | 10.167.66.148/31 | 10.167.66.148 – 10.167.66.149 | 10.167.66.149 |
| 76 | 10.167.66.150/31 | 10.167.66.150 – 10.167.66.151 | 10.167.66.151 |
| 77 | 10.167.66.152/31 | 10.167.66.152 – 10.167.66.153 | 10.167.66.153 |
| 78 | 10.167.66.154/31 | 10.167.66.154 – 10.167.66.155 | 10.167.66.155 |
| 79 | 10.167.66.156/31 | 10.167.66.156 – 10.167.66.157 | 10.167.66.157 |
| 80 | 10.167.66.158/31 | 10.167.66.158 – 10.167.66.159 | 10.167.66.159 |
| 81 | 10.167.66.160/31 | 10.167.66.160 – 10.167.66.161 | 10.167.66.161 |
| 82 | 10.167.66.162/31 | 10.167.66.162 – 10.167.66.163 | 10.167.66.163 |
| 83 | 10.167.66.164/31 | 10.167.66.164 – 10.167.66.165 | 10.167.66.165 |
| 84 | 10.167.66.166/31 | 10.167.66.166 – 10.167.66.167 | 10.167.66.167 |
| 85 | 10.167.66.168/31 | 10.167.66.168 – 10.167.66.169 | 10.167.66.169 |
| 86 | 10.167.66.170/31 | 10.167.66.170 – 10.167.66.171 | 10.167.66.171 |
| 87 | 10.167.66.172/31 | 10.167.66.172 – 10.167.66.173 | 10.167.66.173 |
| 88 | 10.167.66.174/31 | 10.167.66.174 – 10.167.66.175 | 10.167.66.175 |
| 89 | 10.167.66.176/31 | 10.167.66.176 – 10.167.66.177 | 10.167.66.177 |
| 90 | 10.167.66.178/31 | 10.167.66.178 – 10.167.66.179 | 10.167.66.179 |
| 91 | 10.167.66.180/31 | 10.167.66.180 – 10.167.66.181 | 10.167.66.181 |
| 92 | 10.167.66.182/31 | 10.167.66.182 – 10.167.66.183 | 10.167.66.183 |
| 93 | 10.167.66.184/31 | 10.167.66.184 – 10.167.66.185 | 10.167.66.185 |
| 94 | 10.167.66.186/31 | 10.167.66.186 – 10.167.66.187 | 10.167.66.187 |
| 95 | 10.167.66.188/31 | 10.167.66.188 – 10.167.66.189 | 10.167.66.189 |
| 96 | 10.167.66.190/31 | 10.167.66.190 – 10.167.66.191 | 10.167.66.191 |
| 97 | 10.167.66.192/31 | 10.167.66.192 – 10.167.66.193 | 10.167.66.193 |
| 98 | 10.167.66.194/31 | 10.167.66.194 – 10.167.66.195 | 10.167.66.195 |
| 99 | 10.167.66.196/31 | 10.167.66.196 – 10.167.66.197 | 10.167.66.197 |
| 100 | 10.167.66.198/31 | 10.167.66.198 – 10.167.66.199 | 10.167.66.199 |
| 101 | 10.167.66.200/31 | 10.167.66.200 – 10.167.66.201 | 10.167.66.201 |
| 102 | 10.167.66.202/31 | 10.167.66.202 – 10.167.66.203 | 10.167.66.203 |
| 103 | 10.167.66.204/31 | 10.167.66.204 – 10.167.66.205 | 10.167.66.205 |
| 104 | 10.167.66.206/31 | 10.167.66.206 – 10.167.66.207 | 10.167.66.207 |
| 105 | 10.167.66.208/31 | 10.167.66.208 – 10.167.66.209 | 10.167.66.209 |
| 106 | 10.167.66.210/31 | 10.167.66.210 – 10.167.66.211 | 10.167.66.211 |
| 107 | 10.167.66.212/31 | 10.167.66.212 – 10.167.66.213 | 10.167.66.213 |
| 108 | 10.167.66.214/31 | 10.167.66.214 – 10.167.66.215 | 10.167.66.215 |
| 109 | 10.167.66.216/31 | 10.167.66.216 – 10.167.66.217 | 10.167.66.217 |
| 110 | 10.167.66.218/31 | 10.167.66.218 – 10.167.66.219 | 10.167.66.219 |
| 111 | 10.167.66.220/31 | 10.167.66.220 – 10.167.66.221 | 10.167.66.221 |
| 112 | 10.167.66.222/31 | 10.167.66.222 – 10.167.66.223 | 10.167.66.223 |
| 113 | 10.167.66.224/31 | 10.167.66.224 – 10.167.66.225 | 10.167.66.225 |
| 114 | 10.167.66.226/31 | 10.167.66.226 – 10.167.66.227 | 10.167.66.227 |
| 115 | 10.167.66.228/31 | 10.167.66.228 – 10.167.66.229 | 10.167.66.229 |
| 116 | 10.167.66.230/31 | 10.167.66.230 – 10.167.66.231 | 10.167.66.231 |
| 117 | 10.167.66.232/31 | 10.167.66.232 – 10.167.66.233 | 10.167.66.233 |
| 118 | 10.167.66.234/31 | 10.167.66.234 – 10.167.66.235 | 10.167.66.235 |
| 119 | 10.167.66.236/31 | 10.167.66.236 – 10.167.66.237 | 10.167.66.237 |
| 120 | 10.167.66.238/31 | 10.167.66.238 – 10.167.66.239 | 10.167.66.239 |
| 121 | 10.167.66.240/31 | 10.167.66.240 – 10.167.66.241 | 10.167.66.241 |
| 122 | 10.167.66.242/31 | 10.167.66.242 – 10.167.66.243 | 10.167.66.243 |
| 123 | 10.167.66.244/31 | 10.167.66.244 – 10.167.66.245 | 10.167.66.245 |
| 124 | 10.167.66.246/31 | 10.167.66.246 – 10.167.66.247 | 10.167.66.247 |
| 125 | 10.167.66.248/31 | 10.167.66.248 – 10.167.66.249 | 10.167.66.249 |
| 126 | 10.167.66.250/31 | 10.167.66.250 – 10.167.66.251 | 10.167.66.251 |
| 127 | 10.167.66.252/31 | 10.167.66.252 – 10.167.66.253 | 10.167.66.253 |
| 128 | 10.167.66.254/31 | 10.167.66.254 – 10.167.66.255 | 10.167.66.255 |
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 /24 |
|---|---|---|---|---|
| /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 | 1 |
| /25 | 255.255.255.128 | 128 | 126 | 2 split → |
| /26 | 255.255.255.192 | 64 | 62 | 4 split → |
| /27 | 255.255.255.224 | 32 | 30 | 8 split → |
| /28 | 255.255.255.240 | 16 | 14 | 16 split → |
| /29 | 255.255.255.248 | 8 | 6 | 32 split → |
| /30 | 255.255.255.252 | 4 | 2 | 64 split → |
| /31 | 255.255.255.254 | 2 | 2 | 128 split → |
| /32 | 255.255.255.255 | 1 | 1 | 256 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.