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)10.3.207.0/24
network10.3.207.0/24
broadcast10.3.207.255
first host10.3.207.1
last host10.3.207.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.3.207.0/24
address00001010.00000011.11001111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000011.11001111.00000000
broadcast00001010.00000011.11001111.11111111
green = network part, grey = host part
hex0x0a03cf00
decimal168021760
reverse dns0.207.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:cf00
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.3.207.0/31 | 10.3.207.0 – 10.3.207.1 | 10.3.207.1 |
| 2 | 10.3.207.2/31 | 10.3.207.2 – 10.3.207.3 | 10.3.207.3 |
| 3 | 10.3.207.4/31 | 10.3.207.4 – 10.3.207.5 | 10.3.207.5 |
| 4 | 10.3.207.6/31 | 10.3.207.6 – 10.3.207.7 | 10.3.207.7 |
| 5 | 10.3.207.8/31 | 10.3.207.8 – 10.3.207.9 | 10.3.207.9 |
| 6 | 10.3.207.10/31 | 10.3.207.10 – 10.3.207.11 | 10.3.207.11 |
| 7 | 10.3.207.12/31 | 10.3.207.12 – 10.3.207.13 | 10.3.207.13 |
| 8 | 10.3.207.14/31 | 10.3.207.14 – 10.3.207.15 | 10.3.207.15 |
| 9 | 10.3.207.16/31 | 10.3.207.16 – 10.3.207.17 | 10.3.207.17 |
| 10 | 10.3.207.18/31 | 10.3.207.18 – 10.3.207.19 | 10.3.207.19 |
| 11 | 10.3.207.20/31 | 10.3.207.20 – 10.3.207.21 | 10.3.207.21 |
| 12 | 10.3.207.22/31 | 10.3.207.22 – 10.3.207.23 | 10.3.207.23 |
| 13 | 10.3.207.24/31 | 10.3.207.24 – 10.3.207.25 | 10.3.207.25 |
| 14 | 10.3.207.26/31 | 10.3.207.26 – 10.3.207.27 | 10.3.207.27 |
| 15 | 10.3.207.28/31 | 10.3.207.28 – 10.3.207.29 | 10.3.207.29 |
| 16 | 10.3.207.30/31 | 10.3.207.30 – 10.3.207.31 | 10.3.207.31 |
| 17 | 10.3.207.32/31 | 10.3.207.32 – 10.3.207.33 | 10.3.207.33 |
| 18 | 10.3.207.34/31 | 10.3.207.34 – 10.3.207.35 | 10.3.207.35 |
| 19 | 10.3.207.36/31 | 10.3.207.36 – 10.3.207.37 | 10.3.207.37 |
| 20 | 10.3.207.38/31 | 10.3.207.38 – 10.3.207.39 | 10.3.207.39 |
| 21 | 10.3.207.40/31 | 10.3.207.40 – 10.3.207.41 | 10.3.207.41 |
| 22 | 10.3.207.42/31 | 10.3.207.42 – 10.3.207.43 | 10.3.207.43 |
| 23 | 10.3.207.44/31 | 10.3.207.44 – 10.3.207.45 | 10.3.207.45 |
| 24 | 10.3.207.46/31 | 10.3.207.46 – 10.3.207.47 | 10.3.207.47 |
| 25 | 10.3.207.48/31 | 10.3.207.48 – 10.3.207.49 | 10.3.207.49 |
| 26 | 10.3.207.50/31 | 10.3.207.50 – 10.3.207.51 | 10.3.207.51 |
| 27 | 10.3.207.52/31 | 10.3.207.52 – 10.3.207.53 | 10.3.207.53 |
| 28 | 10.3.207.54/31 | 10.3.207.54 – 10.3.207.55 | 10.3.207.55 |
| 29 | 10.3.207.56/31 | 10.3.207.56 – 10.3.207.57 | 10.3.207.57 |
| 30 | 10.3.207.58/31 | 10.3.207.58 – 10.3.207.59 | 10.3.207.59 |
| 31 | 10.3.207.60/31 | 10.3.207.60 – 10.3.207.61 | 10.3.207.61 |
| 32 | 10.3.207.62/31 | 10.3.207.62 – 10.3.207.63 | 10.3.207.63 |
| 33 | 10.3.207.64/31 | 10.3.207.64 – 10.3.207.65 | 10.3.207.65 |
| 34 | 10.3.207.66/31 | 10.3.207.66 – 10.3.207.67 | 10.3.207.67 |
| 35 | 10.3.207.68/31 | 10.3.207.68 – 10.3.207.69 | 10.3.207.69 |
| 36 | 10.3.207.70/31 | 10.3.207.70 – 10.3.207.71 | 10.3.207.71 |
| 37 | 10.3.207.72/31 | 10.3.207.72 – 10.3.207.73 | 10.3.207.73 |
| 38 | 10.3.207.74/31 | 10.3.207.74 – 10.3.207.75 | 10.3.207.75 |
| 39 | 10.3.207.76/31 | 10.3.207.76 – 10.3.207.77 | 10.3.207.77 |
| 40 | 10.3.207.78/31 | 10.3.207.78 – 10.3.207.79 | 10.3.207.79 |
| 41 | 10.3.207.80/31 | 10.3.207.80 – 10.3.207.81 | 10.3.207.81 |
| 42 | 10.3.207.82/31 | 10.3.207.82 – 10.3.207.83 | 10.3.207.83 |
| 43 | 10.3.207.84/31 | 10.3.207.84 – 10.3.207.85 | 10.3.207.85 |
| 44 | 10.3.207.86/31 | 10.3.207.86 – 10.3.207.87 | 10.3.207.87 |
| 45 | 10.3.207.88/31 | 10.3.207.88 – 10.3.207.89 | 10.3.207.89 |
| 46 | 10.3.207.90/31 | 10.3.207.90 – 10.3.207.91 | 10.3.207.91 |
| 47 | 10.3.207.92/31 | 10.3.207.92 – 10.3.207.93 | 10.3.207.93 |
| 48 | 10.3.207.94/31 | 10.3.207.94 – 10.3.207.95 | 10.3.207.95 |
| 49 | 10.3.207.96/31 | 10.3.207.96 – 10.3.207.97 | 10.3.207.97 |
| 50 | 10.3.207.98/31 | 10.3.207.98 – 10.3.207.99 | 10.3.207.99 |
| 51 | 10.3.207.100/31 | 10.3.207.100 – 10.3.207.101 | 10.3.207.101 |
| 52 | 10.3.207.102/31 | 10.3.207.102 – 10.3.207.103 | 10.3.207.103 |
| 53 | 10.3.207.104/31 | 10.3.207.104 – 10.3.207.105 | 10.3.207.105 |
| 54 | 10.3.207.106/31 | 10.3.207.106 – 10.3.207.107 | 10.3.207.107 |
| 55 | 10.3.207.108/31 | 10.3.207.108 – 10.3.207.109 | 10.3.207.109 |
| 56 | 10.3.207.110/31 | 10.3.207.110 – 10.3.207.111 | 10.3.207.111 |
| 57 | 10.3.207.112/31 | 10.3.207.112 – 10.3.207.113 | 10.3.207.113 |
| 58 | 10.3.207.114/31 | 10.3.207.114 – 10.3.207.115 | 10.3.207.115 |
| 59 | 10.3.207.116/31 | 10.3.207.116 – 10.3.207.117 | 10.3.207.117 |
| 60 | 10.3.207.118/31 | 10.3.207.118 – 10.3.207.119 | 10.3.207.119 |
| 61 | 10.3.207.120/31 | 10.3.207.120 – 10.3.207.121 | 10.3.207.121 |
| 62 | 10.3.207.122/31 | 10.3.207.122 – 10.3.207.123 | 10.3.207.123 |
| 63 | 10.3.207.124/31 | 10.3.207.124 – 10.3.207.125 | 10.3.207.125 |
| 64 | 10.3.207.126/31 | 10.3.207.126 – 10.3.207.127 | 10.3.207.127 |
| 65 | 10.3.207.128/31 | 10.3.207.128 – 10.3.207.129 | 10.3.207.129 |
| 66 | 10.3.207.130/31 | 10.3.207.130 – 10.3.207.131 | 10.3.207.131 |
| 67 | 10.3.207.132/31 | 10.3.207.132 – 10.3.207.133 | 10.3.207.133 |
| 68 | 10.3.207.134/31 | 10.3.207.134 – 10.3.207.135 | 10.3.207.135 |
| 69 | 10.3.207.136/31 | 10.3.207.136 – 10.3.207.137 | 10.3.207.137 |
| 70 | 10.3.207.138/31 | 10.3.207.138 – 10.3.207.139 | 10.3.207.139 |
| 71 | 10.3.207.140/31 | 10.3.207.140 – 10.3.207.141 | 10.3.207.141 |
| 72 | 10.3.207.142/31 | 10.3.207.142 – 10.3.207.143 | 10.3.207.143 |
| 73 | 10.3.207.144/31 | 10.3.207.144 – 10.3.207.145 | 10.3.207.145 |
| 74 | 10.3.207.146/31 | 10.3.207.146 – 10.3.207.147 | 10.3.207.147 |
| 75 | 10.3.207.148/31 | 10.3.207.148 – 10.3.207.149 | 10.3.207.149 |
| 76 | 10.3.207.150/31 | 10.3.207.150 – 10.3.207.151 | 10.3.207.151 |
| 77 | 10.3.207.152/31 | 10.3.207.152 – 10.3.207.153 | 10.3.207.153 |
| 78 | 10.3.207.154/31 | 10.3.207.154 – 10.3.207.155 | 10.3.207.155 |
| 79 | 10.3.207.156/31 | 10.3.207.156 – 10.3.207.157 | 10.3.207.157 |
| 80 | 10.3.207.158/31 | 10.3.207.158 – 10.3.207.159 | 10.3.207.159 |
| 81 | 10.3.207.160/31 | 10.3.207.160 – 10.3.207.161 | 10.3.207.161 |
| 82 | 10.3.207.162/31 | 10.3.207.162 – 10.3.207.163 | 10.3.207.163 |
| 83 | 10.3.207.164/31 | 10.3.207.164 – 10.3.207.165 | 10.3.207.165 |
| 84 | 10.3.207.166/31 | 10.3.207.166 – 10.3.207.167 | 10.3.207.167 |
| 85 | 10.3.207.168/31 | 10.3.207.168 – 10.3.207.169 | 10.3.207.169 |
| 86 | 10.3.207.170/31 | 10.3.207.170 – 10.3.207.171 | 10.3.207.171 |
| 87 | 10.3.207.172/31 | 10.3.207.172 – 10.3.207.173 | 10.3.207.173 |
| 88 | 10.3.207.174/31 | 10.3.207.174 – 10.3.207.175 | 10.3.207.175 |
| 89 | 10.3.207.176/31 | 10.3.207.176 – 10.3.207.177 | 10.3.207.177 |
| 90 | 10.3.207.178/31 | 10.3.207.178 – 10.3.207.179 | 10.3.207.179 |
| 91 | 10.3.207.180/31 | 10.3.207.180 – 10.3.207.181 | 10.3.207.181 |
| 92 | 10.3.207.182/31 | 10.3.207.182 – 10.3.207.183 | 10.3.207.183 |
| 93 | 10.3.207.184/31 | 10.3.207.184 – 10.3.207.185 | 10.3.207.185 |
| 94 | 10.3.207.186/31 | 10.3.207.186 – 10.3.207.187 | 10.3.207.187 |
| 95 | 10.3.207.188/31 | 10.3.207.188 – 10.3.207.189 | 10.3.207.189 |
| 96 | 10.3.207.190/31 | 10.3.207.190 – 10.3.207.191 | 10.3.207.191 |
| 97 | 10.3.207.192/31 | 10.3.207.192 – 10.3.207.193 | 10.3.207.193 |
| 98 | 10.3.207.194/31 | 10.3.207.194 – 10.3.207.195 | 10.3.207.195 |
| 99 | 10.3.207.196/31 | 10.3.207.196 – 10.3.207.197 | 10.3.207.197 |
| 100 | 10.3.207.198/31 | 10.3.207.198 – 10.3.207.199 | 10.3.207.199 |
| 101 | 10.3.207.200/31 | 10.3.207.200 – 10.3.207.201 | 10.3.207.201 |
| 102 | 10.3.207.202/31 | 10.3.207.202 – 10.3.207.203 | 10.3.207.203 |
| 103 | 10.3.207.204/31 | 10.3.207.204 – 10.3.207.205 | 10.3.207.205 |
| 104 | 10.3.207.206/31 | 10.3.207.206 – 10.3.207.207 | 10.3.207.207 |
| 105 | 10.3.207.208/31 | 10.3.207.208 – 10.3.207.209 | 10.3.207.209 |
| 106 | 10.3.207.210/31 | 10.3.207.210 – 10.3.207.211 | 10.3.207.211 |
| 107 | 10.3.207.212/31 | 10.3.207.212 – 10.3.207.213 | 10.3.207.213 |
| 108 | 10.3.207.214/31 | 10.3.207.214 – 10.3.207.215 | 10.3.207.215 |
| 109 | 10.3.207.216/31 | 10.3.207.216 – 10.3.207.217 | 10.3.207.217 |
| 110 | 10.3.207.218/31 | 10.3.207.218 – 10.3.207.219 | 10.3.207.219 |
| 111 | 10.3.207.220/31 | 10.3.207.220 – 10.3.207.221 | 10.3.207.221 |
| 112 | 10.3.207.222/31 | 10.3.207.222 – 10.3.207.223 | 10.3.207.223 |
| 113 | 10.3.207.224/31 | 10.3.207.224 – 10.3.207.225 | 10.3.207.225 |
| 114 | 10.3.207.226/31 | 10.3.207.226 – 10.3.207.227 | 10.3.207.227 |
| 115 | 10.3.207.228/31 | 10.3.207.228 – 10.3.207.229 | 10.3.207.229 |
| 116 | 10.3.207.230/31 | 10.3.207.230 – 10.3.207.231 | 10.3.207.231 |
| 117 | 10.3.207.232/31 | 10.3.207.232 – 10.3.207.233 | 10.3.207.233 |
| 118 | 10.3.207.234/31 | 10.3.207.234 – 10.3.207.235 | 10.3.207.235 |
| 119 | 10.3.207.236/31 | 10.3.207.236 – 10.3.207.237 | 10.3.207.237 |
| 120 | 10.3.207.238/31 | 10.3.207.238 – 10.3.207.239 | 10.3.207.239 |
| 121 | 10.3.207.240/31 | 10.3.207.240 – 10.3.207.241 | 10.3.207.241 |
| 122 | 10.3.207.242/31 | 10.3.207.242 – 10.3.207.243 | 10.3.207.243 |
| 123 | 10.3.207.244/31 | 10.3.207.244 – 10.3.207.245 | 10.3.207.245 |
| 124 | 10.3.207.246/31 | 10.3.207.246 – 10.3.207.247 | 10.3.207.247 |
| 125 | 10.3.207.248/31 | 10.3.207.248 – 10.3.207.249 | 10.3.207.249 |
| 126 | 10.3.207.250/31 | 10.3.207.250 – 10.3.207.251 | 10.3.207.251 |
| 127 | 10.3.207.252/31 | 10.3.207.252 – 10.3.207.253 | 10.3.207.253 |
| 128 | 10.3.207.254/31 | 10.3.207.254 – 10.3.207.255 | 10.3.207.255 |
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.