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)10.64.166.0/24
network10.64.166.0/24
broadcast10.64.166.255
first host10.64.166.1
last host10.64.166.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.64.166.0/24
address00001010.01000000.10100110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01000000.10100110.00000000
broadcast00001010.01000000.10100110.11111111
green = network part, grey = host part
hex0x0a40a600
decimal172008960
reverse dns0.166.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:a600
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.64.166.0/31 | 10.64.166.0 – 10.64.166.1 | 10.64.166.1 |
| 2 | 10.64.166.2/31 | 10.64.166.2 – 10.64.166.3 | 10.64.166.3 |
| 3 | 10.64.166.4/31 | 10.64.166.4 – 10.64.166.5 | 10.64.166.5 |
| 4 | 10.64.166.6/31 | 10.64.166.6 – 10.64.166.7 | 10.64.166.7 |
| 5 | 10.64.166.8/31 | 10.64.166.8 – 10.64.166.9 | 10.64.166.9 |
| 6 | 10.64.166.10/31 | 10.64.166.10 – 10.64.166.11 | 10.64.166.11 |
| 7 | 10.64.166.12/31 | 10.64.166.12 – 10.64.166.13 | 10.64.166.13 |
| 8 | 10.64.166.14/31 | 10.64.166.14 – 10.64.166.15 | 10.64.166.15 |
| 9 | 10.64.166.16/31 | 10.64.166.16 – 10.64.166.17 | 10.64.166.17 |
| 10 | 10.64.166.18/31 | 10.64.166.18 – 10.64.166.19 | 10.64.166.19 |
| 11 | 10.64.166.20/31 | 10.64.166.20 – 10.64.166.21 | 10.64.166.21 |
| 12 | 10.64.166.22/31 | 10.64.166.22 – 10.64.166.23 | 10.64.166.23 |
| 13 | 10.64.166.24/31 | 10.64.166.24 – 10.64.166.25 | 10.64.166.25 |
| 14 | 10.64.166.26/31 | 10.64.166.26 – 10.64.166.27 | 10.64.166.27 |
| 15 | 10.64.166.28/31 | 10.64.166.28 – 10.64.166.29 | 10.64.166.29 |
| 16 | 10.64.166.30/31 | 10.64.166.30 – 10.64.166.31 | 10.64.166.31 |
| 17 | 10.64.166.32/31 | 10.64.166.32 – 10.64.166.33 | 10.64.166.33 |
| 18 | 10.64.166.34/31 | 10.64.166.34 – 10.64.166.35 | 10.64.166.35 |
| 19 | 10.64.166.36/31 | 10.64.166.36 – 10.64.166.37 | 10.64.166.37 |
| 20 | 10.64.166.38/31 | 10.64.166.38 – 10.64.166.39 | 10.64.166.39 |
| 21 | 10.64.166.40/31 | 10.64.166.40 – 10.64.166.41 | 10.64.166.41 |
| 22 | 10.64.166.42/31 | 10.64.166.42 – 10.64.166.43 | 10.64.166.43 |
| 23 | 10.64.166.44/31 | 10.64.166.44 – 10.64.166.45 | 10.64.166.45 |
| 24 | 10.64.166.46/31 | 10.64.166.46 – 10.64.166.47 | 10.64.166.47 |
| 25 | 10.64.166.48/31 | 10.64.166.48 – 10.64.166.49 | 10.64.166.49 |
| 26 | 10.64.166.50/31 | 10.64.166.50 – 10.64.166.51 | 10.64.166.51 |
| 27 | 10.64.166.52/31 | 10.64.166.52 – 10.64.166.53 | 10.64.166.53 |
| 28 | 10.64.166.54/31 | 10.64.166.54 – 10.64.166.55 | 10.64.166.55 |
| 29 | 10.64.166.56/31 | 10.64.166.56 – 10.64.166.57 | 10.64.166.57 |
| 30 | 10.64.166.58/31 | 10.64.166.58 – 10.64.166.59 | 10.64.166.59 |
| 31 | 10.64.166.60/31 | 10.64.166.60 – 10.64.166.61 | 10.64.166.61 |
| 32 | 10.64.166.62/31 | 10.64.166.62 – 10.64.166.63 | 10.64.166.63 |
| 33 | 10.64.166.64/31 | 10.64.166.64 – 10.64.166.65 | 10.64.166.65 |
| 34 | 10.64.166.66/31 | 10.64.166.66 – 10.64.166.67 | 10.64.166.67 |
| 35 | 10.64.166.68/31 | 10.64.166.68 – 10.64.166.69 | 10.64.166.69 |
| 36 | 10.64.166.70/31 | 10.64.166.70 – 10.64.166.71 | 10.64.166.71 |
| 37 | 10.64.166.72/31 | 10.64.166.72 – 10.64.166.73 | 10.64.166.73 |
| 38 | 10.64.166.74/31 | 10.64.166.74 – 10.64.166.75 | 10.64.166.75 |
| 39 | 10.64.166.76/31 | 10.64.166.76 – 10.64.166.77 | 10.64.166.77 |
| 40 | 10.64.166.78/31 | 10.64.166.78 – 10.64.166.79 | 10.64.166.79 |
| 41 | 10.64.166.80/31 | 10.64.166.80 – 10.64.166.81 | 10.64.166.81 |
| 42 | 10.64.166.82/31 | 10.64.166.82 – 10.64.166.83 | 10.64.166.83 |
| 43 | 10.64.166.84/31 | 10.64.166.84 – 10.64.166.85 | 10.64.166.85 |
| 44 | 10.64.166.86/31 | 10.64.166.86 – 10.64.166.87 | 10.64.166.87 |
| 45 | 10.64.166.88/31 | 10.64.166.88 – 10.64.166.89 | 10.64.166.89 |
| 46 | 10.64.166.90/31 | 10.64.166.90 – 10.64.166.91 | 10.64.166.91 |
| 47 | 10.64.166.92/31 | 10.64.166.92 – 10.64.166.93 | 10.64.166.93 |
| 48 | 10.64.166.94/31 | 10.64.166.94 – 10.64.166.95 | 10.64.166.95 |
| 49 | 10.64.166.96/31 | 10.64.166.96 – 10.64.166.97 | 10.64.166.97 |
| 50 | 10.64.166.98/31 | 10.64.166.98 – 10.64.166.99 | 10.64.166.99 |
| 51 | 10.64.166.100/31 | 10.64.166.100 – 10.64.166.101 | 10.64.166.101 |
| 52 | 10.64.166.102/31 | 10.64.166.102 – 10.64.166.103 | 10.64.166.103 |
| 53 | 10.64.166.104/31 | 10.64.166.104 – 10.64.166.105 | 10.64.166.105 |
| 54 | 10.64.166.106/31 | 10.64.166.106 – 10.64.166.107 | 10.64.166.107 |
| 55 | 10.64.166.108/31 | 10.64.166.108 – 10.64.166.109 | 10.64.166.109 |
| 56 | 10.64.166.110/31 | 10.64.166.110 – 10.64.166.111 | 10.64.166.111 |
| 57 | 10.64.166.112/31 | 10.64.166.112 – 10.64.166.113 | 10.64.166.113 |
| 58 | 10.64.166.114/31 | 10.64.166.114 – 10.64.166.115 | 10.64.166.115 |
| 59 | 10.64.166.116/31 | 10.64.166.116 – 10.64.166.117 | 10.64.166.117 |
| 60 | 10.64.166.118/31 | 10.64.166.118 – 10.64.166.119 | 10.64.166.119 |
| 61 | 10.64.166.120/31 | 10.64.166.120 – 10.64.166.121 | 10.64.166.121 |
| 62 | 10.64.166.122/31 | 10.64.166.122 – 10.64.166.123 | 10.64.166.123 |
| 63 | 10.64.166.124/31 | 10.64.166.124 – 10.64.166.125 | 10.64.166.125 |
| 64 | 10.64.166.126/31 | 10.64.166.126 – 10.64.166.127 | 10.64.166.127 |
| 65 | 10.64.166.128/31 | 10.64.166.128 – 10.64.166.129 | 10.64.166.129 |
| 66 | 10.64.166.130/31 | 10.64.166.130 – 10.64.166.131 | 10.64.166.131 |
| 67 | 10.64.166.132/31 | 10.64.166.132 – 10.64.166.133 | 10.64.166.133 |
| 68 | 10.64.166.134/31 | 10.64.166.134 – 10.64.166.135 | 10.64.166.135 |
| 69 | 10.64.166.136/31 | 10.64.166.136 – 10.64.166.137 | 10.64.166.137 |
| 70 | 10.64.166.138/31 | 10.64.166.138 – 10.64.166.139 | 10.64.166.139 |
| 71 | 10.64.166.140/31 | 10.64.166.140 – 10.64.166.141 | 10.64.166.141 |
| 72 | 10.64.166.142/31 | 10.64.166.142 – 10.64.166.143 | 10.64.166.143 |
| 73 | 10.64.166.144/31 | 10.64.166.144 – 10.64.166.145 | 10.64.166.145 |
| 74 | 10.64.166.146/31 | 10.64.166.146 – 10.64.166.147 | 10.64.166.147 |
| 75 | 10.64.166.148/31 | 10.64.166.148 – 10.64.166.149 | 10.64.166.149 |
| 76 | 10.64.166.150/31 | 10.64.166.150 – 10.64.166.151 | 10.64.166.151 |
| 77 | 10.64.166.152/31 | 10.64.166.152 – 10.64.166.153 | 10.64.166.153 |
| 78 | 10.64.166.154/31 | 10.64.166.154 – 10.64.166.155 | 10.64.166.155 |
| 79 | 10.64.166.156/31 | 10.64.166.156 – 10.64.166.157 | 10.64.166.157 |
| 80 | 10.64.166.158/31 | 10.64.166.158 – 10.64.166.159 | 10.64.166.159 |
| 81 | 10.64.166.160/31 | 10.64.166.160 – 10.64.166.161 | 10.64.166.161 |
| 82 | 10.64.166.162/31 | 10.64.166.162 – 10.64.166.163 | 10.64.166.163 |
| 83 | 10.64.166.164/31 | 10.64.166.164 – 10.64.166.165 | 10.64.166.165 |
| 84 | 10.64.166.166/31 | 10.64.166.166 – 10.64.166.167 | 10.64.166.167 |
| 85 | 10.64.166.168/31 | 10.64.166.168 – 10.64.166.169 | 10.64.166.169 |
| 86 | 10.64.166.170/31 | 10.64.166.170 – 10.64.166.171 | 10.64.166.171 |
| 87 | 10.64.166.172/31 | 10.64.166.172 – 10.64.166.173 | 10.64.166.173 |
| 88 | 10.64.166.174/31 | 10.64.166.174 – 10.64.166.175 | 10.64.166.175 |
| 89 | 10.64.166.176/31 | 10.64.166.176 – 10.64.166.177 | 10.64.166.177 |
| 90 | 10.64.166.178/31 | 10.64.166.178 – 10.64.166.179 | 10.64.166.179 |
| 91 | 10.64.166.180/31 | 10.64.166.180 – 10.64.166.181 | 10.64.166.181 |
| 92 | 10.64.166.182/31 | 10.64.166.182 – 10.64.166.183 | 10.64.166.183 |
| 93 | 10.64.166.184/31 | 10.64.166.184 – 10.64.166.185 | 10.64.166.185 |
| 94 | 10.64.166.186/31 | 10.64.166.186 – 10.64.166.187 | 10.64.166.187 |
| 95 | 10.64.166.188/31 | 10.64.166.188 – 10.64.166.189 | 10.64.166.189 |
| 96 | 10.64.166.190/31 | 10.64.166.190 – 10.64.166.191 | 10.64.166.191 |
| 97 | 10.64.166.192/31 | 10.64.166.192 – 10.64.166.193 | 10.64.166.193 |
| 98 | 10.64.166.194/31 | 10.64.166.194 – 10.64.166.195 | 10.64.166.195 |
| 99 | 10.64.166.196/31 | 10.64.166.196 – 10.64.166.197 | 10.64.166.197 |
| 100 | 10.64.166.198/31 | 10.64.166.198 – 10.64.166.199 | 10.64.166.199 |
| 101 | 10.64.166.200/31 | 10.64.166.200 – 10.64.166.201 | 10.64.166.201 |
| 102 | 10.64.166.202/31 | 10.64.166.202 – 10.64.166.203 | 10.64.166.203 |
| 103 | 10.64.166.204/31 | 10.64.166.204 – 10.64.166.205 | 10.64.166.205 |
| 104 | 10.64.166.206/31 | 10.64.166.206 – 10.64.166.207 | 10.64.166.207 |
| 105 | 10.64.166.208/31 | 10.64.166.208 – 10.64.166.209 | 10.64.166.209 |
| 106 | 10.64.166.210/31 | 10.64.166.210 – 10.64.166.211 | 10.64.166.211 |
| 107 | 10.64.166.212/31 | 10.64.166.212 – 10.64.166.213 | 10.64.166.213 |
| 108 | 10.64.166.214/31 | 10.64.166.214 – 10.64.166.215 | 10.64.166.215 |
| 109 | 10.64.166.216/31 | 10.64.166.216 – 10.64.166.217 | 10.64.166.217 |
| 110 | 10.64.166.218/31 | 10.64.166.218 – 10.64.166.219 | 10.64.166.219 |
| 111 | 10.64.166.220/31 | 10.64.166.220 – 10.64.166.221 | 10.64.166.221 |
| 112 | 10.64.166.222/31 | 10.64.166.222 – 10.64.166.223 | 10.64.166.223 |
| 113 | 10.64.166.224/31 | 10.64.166.224 – 10.64.166.225 | 10.64.166.225 |
| 114 | 10.64.166.226/31 | 10.64.166.226 – 10.64.166.227 | 10.64.166.227 |
| 115 | 10.64.166.228/31 | 10.64.166.228 – 10.64.166.229 | 10.64.166.229 |
| 116 | 10.64.166.230/31 | 10.64.166.230 – 10.64.166.231 | 10.64.166.231 |
| 117 | 10.64.166.232/31 | 10.64.166.232 – 10.64.166.233 | 10.64.166.233 |
| 118 | 10.64.166.234/31 | 10.64.166.234 – 10.64.166.235 | 10.64.166.235 |
| 119 | 10.64.166.236/31 | 10.64.166.236 – 10.64.166.237 | 10.64.166.237 |
| 120 | 10.64.166.238/31 | 10.64.166.238 – 10.64.166.239 | 10.64.166.239 |
| 121 | 10.64.166.240/31 | 10.64.166.240 – 10.64.166.241 | 10.64.166.241 |
| 122 | 10.64.166.242/31 | 10.64.166.242 – 10.64.166.243 | 10.64.166.243 |
| 123 | 10.64.166.244/31 | 10.64.166.244 – 10.64.166.245 | 10.64.166.245 |
| 124 | 10.64.166.246/31 | 10.64.166.246 – 10.64.166.247 | 10.64.166.247 |
| 125 | 10.64.166.248/31 | 10.64.166.248 – 10.64.166.249 | 10.64.166.249 |
| 126 | 10.64.166.250/31 | 10.64.166.250 – 10.64.166.251 | 10.64.166.251 |
| 127 | 10.64.166.252/31 | 10.64.166.252 – 10.64.166.253 | 10.64.166.253 |
| 128 | 10.64.166.254/31 | 10.64.166.254 – 10.64.166.255 | 10.64.166.255 |
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.