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)10.0.251.0/24
network10.0.251.0/24
broadcast10.0.251.255
first host10.0.251.1
last host10.0.251.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.251.0/24
address00001010.00000000.11111011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.11111011.00000000
broadcast00001010.00000000.11111011.11111111
green = network part, grey = host part
hex0x0a00fb00
decimal167836416
reverse dns0.251.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:fb00
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.251.0/31 | 10.0.251.0 – 10.0.251.1 | 10.0.251.1 |
| 2 | 10.0.251.2/31 | 10.0.251.2 – 10.0.251.3 | 10.0.251.3 |
| 3 | 10.0.251.4/31 | 10.0.251.4 – 10.0.251.5 | 10.0.251.5 |
| 4 | 10.0.251.6/31 | 10.0.251.6 – 10.0.251.7 | 10.0.251.7 |
| 5 | 10.0.251.8/31 | 10.0.251.8 – 10.0.251.9 | 10.0.251.9 |
| 6 | 10.0.251.10/31 | 10.0.251.10 – 10.0.251.11 | 10.0.251.11 |
| 7 | 10.0.251.12/31 | 10.0.251.12 – 10.0.251.13 | 10.0.251.13 |
| 8 | 10.0.251.14/31 | 10.0.251.14 – 10.0.251.15 | 10.0.251.15 |
| 9 | 10.0.251.16/31 | 10.0.251.16 – 10.0.251.17 | 10.0.251.17 |
| 10 | 10.0.251.18/31 | 10.0.251.18 – 10.0.251.19 | 10.0.251.19 |
| 11 | 10.0.251.20/31 | 10.0.251.20 – 10.0.251.21 | 10.0.251.21 |
| 12 | 10.0.251.22/31 | 10.0.251.22 – 10.0.251.23 | 10.0.251.23 |
| 13 | 10.0.251.24/31 | 10.0.251.24 – 10.0.251.25 | 10.0.251.25 |
| 14 | 10.0.251.26/31 | 10.0.251.26 – 10.0.251.27 | 10.0.251.27 |
| 15 | 10.0.251.28/31 | 10.0.251.28 – 10.0.251.29 | 10.0.251.29 |
| 16 | 10.0.251.30/31 | 10.0.251.30 – 10.0.251.31 | 10.0.251.31 |
| 17 | 10.0.251.32/31 | 10.0.251.32 – 10.0.251.33 | 10.0.251.33 |
| 18 | 10.0.251.34/31 | 10.0.251.34 – 10.0.251.35 | 10.0.251.35 |
| 19 | 10.0.251.36/31 | 10.0.251.36 – 10.0.251.37 | 10.0.251.37 |
| 20 | 10.0.251.38/31 | 10.0.251.38 – 10.0.251.39 | 10.0.251.39 |
| 21 | 10.0.251.40/31 | 10.0.251.40 – 10.0.251.41 | 10.0.251.41 |
| 22 | 10.0.251.42/31 | 10.0.251.42 – 10.0.251.43 | 10.0.251.43 |
| 23 | 10.0.251.44/31 | 10.0.251.44 – 10.0.251.45 | 10.0.251.45 |
| 24 | 10.0.251.46/31 | 10.0.251.46 – 10.0.251.47 | 10.0.251.47 |
| 25 | 10.0.251.48/31 | 10.0.251.48 – 10.0.251.49 | 10.0.251.49 |
| 26 | 10.0.251.50/31 | 10.0.251.50 – 10.0.251.51 | 10.0.251.51 |
| 27 | 10.0.251.52/31 | 10.0.251.52 – 10.0.251.53 | 10.0.251.53 |
| 28 | 10.0.251.54/31 | 10.0.251.54 – 10.0.251.55 | 10.0.251.55 |
| 29 | 10.0.251.56/31 | 10.0.251.56 – 10.0.251.57 | 10.0.251.57 |
| 30 | 10.0.251.58/31 | 10.0.251.58 – 10.0.251.59 | 10.0.251.59 |
| 31 | 10.0.251.60/31 | 10.0.251.60 – 10.0.251.61 | 10.0.251.61 |
| 32 | 10.0.251.62/31 | 10.0.251.62 – 10.0.251.63 | 10.0.251.63 |
| 33 | 10.0.251.64/31 | 10.0.251.64 – 10.0.251.65 | 10.0.251.65 |
| 34 | 10.0.251.66/31 | 10.0.251.66 – 10.0.251.67 | 10.0.251.67 |
| 35 | 10.0.251.68/31 | 10.0.251.68 – 10.0.251.69 | 10.0.251.69 |
| 36 | 10.0.251.70/31 | 10.0.251.70 – 10.0.251.71 | 10.0.251.71 |
| 37 | 10.0.251.72/31 | 10.0.251.72 – 10.0.251.73 | 10.0.251.73 |
| 38 | 10.0.251.74/31 | 10.0.251.74 – 10.0.251.75 | 10.0.251.75 |
| 39 | 10.0.251.76/31 | 10.0.251.76 – 10.0.251.77 | 10.0.251.77 |
| 40 | 10.0.251.78/31 | 10.0.251.78 – 10.0.251.79 | 10.0.251.79 |
| 41 | 10.0.251.80/31 | 10.0.251.80 – 10.0.251.81 | 10.0.251.81 |
| 42 | 10.0.251.82/31 | 10.0.251.82 – 10.0.251.83 | 10.0.251.83 |
| 43 | 10.0.251.84/31 | 10.0.251.84 – 10.0.251.85 | 10.0.251.85 |
| 44 | 10.0.251.86/31 | 10.0.251.86 – 10.0.251.87 | 10.0.251.87 |
| 45 | 10.0.251.88/31 | 10.0.251.88 – 10.0.251.89 | 10.0.251.89 |
| 46 | 10.0.251.90/31 | 10.0.251.90 – 10.0.251.91 | 10.0.251.91 |
| 47 | 10.0.251.92/31 | 10.0.251.92 – 10.0.251.93 | 10.0.251.93 |
| 48 | 10.0.251.94/31 | 10.0.251.94 – 10.0.251.95 | 10.0.251.95 |
| 49 | 10.0.251.96/31 | 10.0.251.96 – 10.0.251.97 | 10.0.251.97 |
| 50 | 10.0.251.98/31 | 10.0.251.98 – 10.0.251.99 | 10.0.251.99 |
| 51 | 10.0.251.100/31 | 10.0.251.100 – 10.0.251.101 | 10.0.251.101 |
| 52 | 10.0.251.102/31 | 10.0.251.102 – 10.0.251.103 | 10.0.251.103 |
| 53 | 10.0.251.104/31 | 10.0.251.104 – 10.0.251.105 | 10.0.251.105 |
| 54 | 10.0.251.106/31 | 10.0.251.106 – 10.0.251.107 | 10.0.251.107 |
| 55 | 10.0.251.108/31 | 10.0.251.108 – 10.0.251.109 | 10.0.251.109 |
| 56 | 10.0.251.110/31 | 10.0.251.110 – 10.0.251.111 | 10.0.251.111 |
| 57 | 10.0.251.112/31 | 10.0.251.112 – 10.0.251.113 | 10.0.251.113 |
| 58 | 10.0.251.114/31 | 10.0.251.114 – 10.0.251.115 | 10.0.251.115 |
| 59 | 10.0.251.116/31 | 10.0.251.116 – 10.0.251.117 | 10.0.251.117 |
| 60 | 10.0.251.118/31 | 10.0.251.118 – 10.0.251.119 | 10.0.251.119 |
| 61 | 10.0.251.120/31 | 10.0.251.120 – 10.0.251.121 | 10.0.251.121 |
| 62 | 10.0.251.122/31 | 10.0.251.122 – 10.0.251.123 | 10.0.251.123 |
| 63 | 10.0.251.124/31 | 10.0.251.124 – 10.0.251.125 | 10.0.251.125 |
| 64 | 10.0.251.126/31 | 10.0.251.126 – 10.0.251.127 | 10.0.251.127 |
| 65 | 10.0.251.128/31 | 10.0.251.128 – 10.0.251.129 | 10.0.251.129 |
| 66 | 10.0.251.130/31 | 10.0.251.130 – 10.0.251.131 | 10.0.251.131 |
| 67 | 10.0.251.132/31 | 10.0.251.132 – 10.0.251.133 | 10.0.251.133 |
| 68 | 10.0.251.134/31 | 10.0.251.134 – 10.0.251.135 | 10.0.251.135 |
| 69 | 10.0.251.136/31 | 10.0.251.136 – 10.0.251.137 | 10.0.251.137 |
| 70 | 10.0.251.138/31 | 10.0.251.138 – 10.0.251.139 | 10.0.251.139 |
| 71 | 10.0.251.140/31 | 10.0.251.140 – 10.0.251.141 | 10.0.251.141 |
| 72 | 10.0.251.142/31 | 10.0.251.142 – 10.0.251.143 | 10.0.251.143 |
| 73 | 10.0.251.144/31 | 10.0.251.144 – 10.0.251.145 | 10.0.251.145 |
| 74 | 10.0.251.146/31 | 10.0.251.146 – 10.0.251.147 | 10.0.251.147 |
| 75 | 10.0.251.148/31 | 10.0.251.148 – 10.0.251.149 | 10.0.251.149 |
| 76 | 10.0.251.150/31 | 10.0.251.150 – 10.0.251.151 | 10.0.251.151 |
| 77 | 10.0.251.152/31 | 10.0.251.152 – 10.0.251.153 | 10.0.251.153 |
| 78 | 10.0.251.154/31 | 10.0.251.154 – 10.0.251.155 | 10.0.251.155 |
| 79 | 10.0.251.156/31 | 10.0.251.156 – 10.0.251.157 | 10.0.251.157 |
| 80 | 10.0.251.158/31 | 10.0.251.158 – 10.0.251.159 | 10.0.251.159 |
| 81 | 10.0.251.160/31 | 10.0.251.160 – 10.0.251.161 | 10.0.251.161 |
| 82 | 10.0.251.162/31 | 10.0.251.162 – 10.0.251.163 | 10.0.251.163 |
| 83 | 10.0.251.164/31 | 10.0.251.164 – 10.0.251.165 | 10.0.251.165 |
| 84 | 10.0.251.166/31 | 10.0.251.166 – 10.0.251.167 | 10.0.251.167 |
| 85 | 10.0.251.168/31 | 10.0.251.168 – 10.0.251.169 | 10.0.251.169 |
| 86 | 10.0.251.170/31 | 10.0.251.170 – 10.0.251.171 | 10.0.251.171 |
| 87 | 10.0.251.172/31 | 10.0.251.172 – 10.0.251.173 | 10.0.251.173 |
| 88 | 10.0.251.174/31 | 10.0.251.174 – 10.0.251.175 | 10.0.251.175 |
| 89 | 10.0.251.176/31 | 10.0.251.176 – 10.0.251.177 | 10.0.251.177 |
| 90 | 10.0.251.178/31 | 10.0.251.178 – 10.0.251.179 | 10.0.251.179 |
| 91 | 10.0.251.180/31 | 10.0.251.180 – 10.0.251.181 | 10.0.251.181 |
| 92 | 10.0.251.182/31 | 10.0.251.182 – 10.0.251.183 | 10.0.251.183 |
| 93 | 10.0.251.184/31 | 10.0.251.184 – 10.0.251.185 | 10.0.251.185 |
| 94 | 10.0.251.186/31 | 10.0.251.186 – 10.0.251.187 | 10.0.251.187 |
| 95 | 10.0.251.188/31 | 10.0.251.188 – 10.0.251.189 | 10.0.251.189 |
| 96 | 10.0.251.190/31 | 10.0.251.190 – 10.0.251.191 | 10.0.251.191 |
| 97 | 10.0.251.192/31 | 10.0.251.192 – 10.0.251.193 | 10.0.251.193 |
| 98 | 10.0.251.194/31 | 10.0.251.194 – 10.0.251.195 | 10.0.251.195 |
| 99 | 10.0.251.196/31 | 10.0.251.196 – 10.0.251.197 | 10.0.251.197 |
| 100 | 10.0.251.198/31 | 10.0.251.198 – 10.0.251.199 | 10.0.251.199 |
| 101 | 10.0.251.200/31 | 10.0.251.200 – 10.0.251.201 | 10.0.251.201 |
| 102 | 10.0.251.202/31 | 10.0.251.202 – 10.0.251.203 | 10.0.251.203 |
| 103 | 10.0.251.204/31 | 10.0.251.204 – 10.0.251.205 | 10.0.251.205 |
| 104 | 10.0.251.206/31 | 10.0.251.206 – 10.0.251.207 | 10.0.251.207 |
| 105 | 10.0.251.208/31 | 10.0.251.208 – 10.0.251.209 | 10.0.251.209 |
| 106 | 10.0.251.210/31 | 10.0.251.210 – 10.0.251.211 | 10.0.251.211 |
| 107 | 10.0.251.212/31 | 10.0.251.212 – 10.0.251.213 | 10.0.251.213 |
| 108 | 10.0.251.214/31 | 10.0.251.214 – 10.0.251.215 | 10.0.251.215 |
| 109 | 10.0.251.216/31 | 10.0.251.216 – 10.0.251.217 | 10.0.251.217 |
| 110 | 10.0.251.218/31 | 10.0.251.218 – 10.0.251.219 | 10.0.251.219 |
| 111 | 10.0.251.220/31 | 10.0.251.220 – 10.0.251.221 | 10.0.251.221 |
| 112 | 10.0.251.222/31 | 10.0.251.222 – 10.0.251.223 | 10.0.251.223 |
| 113 | 10.0.251.224/31 | 10.0.251.224 – 10.0.251.225 | 10.0.251.225 |
| 114 | 10.0.251.226/31 | 10.0.251.226 – 10.0.251.227 | 10.0.251.227 |
| 115 | 10.0.251.228/31 | 10.0.251.228 – 10.0.251.229 | 10.0.251.229 |
| 116 | 10.0.251.230/31 | 10.0.251.230 – 10.0.251.231 | 10.0.251.231 |
| 117 | 10.0.251.232/31 | 10.0.251.232 – 10.0.251.233 | 10.0.251.233 |
| 118 | 10.0.251.234/31 | 10.0.251.234 – 10.0.251.235 | 10.0.251.235 |
| 119 | 10.0.251.236/31 | 10.0.251.236 – 10.0.251.237 | 10.0.251.237 |
| 120 | 10.0.251.238/31 | 10.0.251.238 – 10.0.251.239 | 10.0.251.239 |
| 121 | 10.0.251.240/31 | 10.0.251.240 – 10.0.251.241 | 10.0.251.241 |
| 122 | 10.0.251.242/31 | 10.0.251.242 – 10.0.251.243 | 10.0.251.243 |
| 123 | 10.0.251.244/31 | 10.0.251.244 – 10.0.251.245 | 10.0.251.245 |
| 124 | 10.0.251.246/31 | 10.0.251.246 – 10.0.251.247 | 10.0.251.247 |
| 125 | 10.0.251.248/31 | 10.0.251.248 – 10.0.251.249 | 10.0.251.249 |
| 126 | 10.0.251.250/31 | 10.0.251.250 – 10.0.251.251 | 10.0.251.251 |
| 127 | 10.0.251.252/31 | 10.0.251.252 – 10.0.251.253 | 10.0.251.253 |
| 128 | 10.0.251.254/31 | 10.0.251.254 – 10.0.251.255 | 10.0.251.255 |
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.