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)10.2.203.0/24
network10.2.203.0/24
broadcast10.2.203.255
first host10.2.203.1
last host10.2.203.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.203.0/24
address00001010.00000010.11001011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.11001011.00000000
broadcast00001010.00000010.11001011.11111111
green = network part, grey = host part
hex0x0a02cb00
decimal167955200
reverse dns0.203.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:cb00
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.2.203.0/31 | 10.2.203.0 – 10.2.203.1 | 10.2.203.1 |
| 2 | 10.2.203.2/31 | 10.2.203.2 – 10.2.203.3 | 10.2.203.3 |
| 3 | 10.2.203.4/31 | 10.2.203.4 – 10.2.203.5 | 10.2.203.5 |
| 4 | 10.2.203.6/31 | 10.2.203.6 – 10.2.203.7 | 10.2.203.7 |
| 5 | 10.2.203.8/31 | 10.2.203.8 – 10.2.203.9 | 10.2.203.9 |
| 6 | 10.2.203.10/31 | 10.2.203.10 – 10.2.203.11 | 10.2.203.11 |
| 7 | 10.2.203.12/31 | 10.2.203.12 – 10.2.203.13 | 10.2.203.13 |
| 8 | 10.2.203.14/31 | 10.2.203.14 – 10.2.203.15 | 10.2.203.15 |
| 9 | 10.2.203.16/31 | 10.2.203.16 – 10.2.203.17 | 10.2.203.17 |
| 10 | 10.2.203.18/31 | 10.2.203.18 – 10.2.203.19 | 10.2.203.19 |
| 11 | 10.2.203.20/31 | 10.2.203.20 – 10.2.203.21 | 10.2.203.21 |
| 12 | 10.2.203.22/31 | 10.2.203.22 – 10.2.203.23 | 10.2.203.23 |
| 13 | 10.2.203.24/31 | 10.2.203.24 – 10.2.203.25 | 10.2.203.25 |
| 14 | 10.2.203.26/31 | 10.2.203.26 – 10.2.203.27 | 10.2.203.27 |
| 15 | 10.2.203.28/31 | 10.2.203.28 – 10.2.203.29 | 10.2.203.29 |
| 16 | 10.2.203.30/31 | 10.2.203.30 – 10.2.203.31 | 10.2.203.31 |
| 17 | 10.2.203.32/31 | 10.2.203.32 – 10.2.203.33 | 10.2.203.33 |
| 18 | 10.2.203.34/31 | 10.2.203.34 – 10.2.203.35 | 10.2.203.35 |
| 19 | 10.2.203.36/31 | 10.2.203.36 – 10.2.203.37 | 10.2.203.37 |
| 20 | 10.2.203.38/31 | 10.2.203.38 – 10.2.203.39 | 10.2.203.39 |
| 21 | 10.2.203.40/31 | 10.2.203.40 – 10.2.203.41 | 10.2.203.41 |
| 22 | 10.2.203.42/31 | 10.2.203.42 – 10.2.203.43 | 10.2.203.43 |
| 23 | 10.2.203.44/31 | 10.2.203.44 – 10.2.203.45 | 10.2.203.45 |
| 24 | 10.2.203.46/31 | 10.2.203.46 – 10.2.203.47 | 10.2.203.47 |
| 25 | 10.2.203.48/31 | 10.2.203.48 – 10.2.203.49 | 10.2.203.49 |
| 26 | 10.2.203.50/31 | 10.2.203.50 – 10.2.203.51 | 10.2.203.51 |
| 27 | 10.2.203.52/31 | 10.2.203.52 – 10.2.203.53 | 10.2.203.53 |
| 28 | 10.2.203.54/31 | 10.2.203.54 – 10.2.203.55 | 10.2.203.55 |
| 29 | 10.2.203.56/31 | 10.2.203.56 – 10.2.203.57 | 10.2.203.57 |
| 30 | 10.2.203.58/31 | 10.2.203.58 – 10.2.203.59 | 10.2.203.59 |
| 31 | 10.2.203.60/31 | 10.2.203.60 – 10.2.203.61 | 10.2.203.61 |
| 32 | 10.2.203.62/31 | 10.2.203.62 – 10.2.203.63 | 10.2.203.63 |
| 33 | 10.2.203.64/31 | 10.2.203.64 – 10.2.203.65 | 10.2.203.65 |
| 34 | 10.2.203.66/31 | 10.2.203.66 – 10.2.203.67 | 10.2.203.67 |
| 35 | 10.2.203.68/31 | 10.2.203.68 – 10.2.203.69 | 10.2.203.69 |
| 36 | 10.2.203.70/31 | 10.2.203.70 – 10.2.203.71 | 10.2.203.71 |
| 37 | 10.2.203.72/31 | 10.2.203.72 – 10.2.203.73 | 10.2.203.73 |
| 38 | 10.2.203.74/31 | 10.2.203.74 – 10.2.203.75 | 10.2.203.75 |
| 39 | 10.2.203.76/31 | 10.2.203.76 – 10.2.203.77 | 10.2.203.77 |
| 40 | 10.2.203.78/31 | 10.2.203.78 – 10.2.203.79 | 10.2.203.79 |
| 41 | 10.2.203.80/31 | 10.2.203.80 – 10.2.203.81 | 10.2.203.81 |
| 42 | 10.2.203.82/31 | 10.2.203.82 – 10.2.203.83 | 10.2.203.83 |
| 43 | 10.2.203.84/31 | 10.2.203.84 – 10.2.203.85 | 10.2.203.85 |
| 44 | 10.2.203.86/31 | 10.2.203.86 – 10.2.203.87 | 10.2.203.87 |
| 45 | 10.2.203.88/31 | 10.2.203.88 – 10.2.203.89 | 10.2.203.89 |
| 46 | 10.2.203.90/31 | 10.2.203.90 – 10.2.203.91 | 10.2.203.91 |
| 47 | 10.2.203.92/31 | 10.2.203.92 – 10.2.203.93 | 10.2.203.93 |
| 48 | 10.2.203.94/31 | 10.2.203.94 – 10.2.203.95 | 10.2.203.95 |
| 49 | 10.2.203.96/31 | 10.2.203.96 – 10.2.203.97 | 10.2.203.97 |
| 50 | 10.2.203.98/31 | 10.2.203.98 – 10.2.203.99 | 10.2.203.99 |
| 51 | 10.2.203.100/31 | 10.2.203.100 – 10.2.203.101 | 10.2.203.101 |
| 52 | 10.2.203.102/31 | 10.2.203.102 – 10.2.203.103 | 10.2.203.103 |
| 53 | 10.2.203.104/31 | 10.2.203.104 – 10.2.203.105 | 10.2.203.105 |
| 54 | 10.2.203.106/31 | 10.2.203.106 – 10.2.203.107 | 10.2.203.107 |
| 55 | 10.2.203.108/31 | 10.2.203.108 – 10.2.203.109 | 10.2.203.109 |
| 56 | 10.2.203.110/31 | 10.2.203.110 – 10.2.203.111 | 10.2.203.111 |
| 57 | 10.2.203.112/31 | 10.2.203.112 – 10.2.203.113 | 10.2.203.113 |
| 58 | 10.2.203.114/31 | 10.2.203.114 – 10.2.203.115 | 10.2.203.115 |
| 59 | 10.2.203.116/31 | 10.2.203.116 – 10.2.203.117 | 10.2.203.117 |
| 60 | 10.2.203.118/31 | 10.2.203.118 – 10.2.203.119 | 10.2.203.119 |
| 61 | 10.2.203.120/31 | 10.2.203.120 – 10.2.203.121 | 10.2.203.121 |
| 62 | 10.2.203.122/31 | 10.2.203.122 – 10.2.203.123 | 10.2.203.123 |
| 63 | 10.2.203.124/31 | 10.2.203.124 – 10.2.203.125 | 10.2.203.125 |
| 64 | 10.2.203.126/31 | 10.2.203.126 – 10.2.203.127 | 10.2.203.127 |
| 65 | 10.2.203.128/31 | 10.2.203.128 – 10.2.203.129 | 10.2.203.129 |
| 66 | 10.2.203.130/31 | 10.2.203.130 – 10.2.203.131 | 10.2.203.131 |
| 67 | 10.2.203.132/31 | 10.2.203.132 – 10.2.203.133 | 10.2.203.133 |
| 68 | 10.2.203.134/31 | 10.2.203.134 – 10.2.203.135 | 10.2.203.135 |
| 69 | 10.2.203.136/31 | 10.2.203.136 – 10.2.203.137 | 10.2.203.137 |
| 70 | 10.2.203.138/31 | 10.2.203.138 – 10.2.203.139 | 10.2.203.139 |
| 71 | 10.2.203.140/31 | 10.2.203.140 – 10.2.203.141 | 10.2.203.141 |
| 72 | 10.2.203.142/31 | 10.2.203.142 – 10.2.203.143 | 10.2.203.143 |
| 73 | 10.2.203.144/31 | 10.2.203.144 – 10.2.203.145 | 10.2.203.145 |
| 74 | 10.2.203.146/31 | 10.2.203.146 – 10.2.203.147 | 10.2.203.147 |
| 75 | 10.2.203.148/31 | 10.2.203.148 – 10.2.203.149 | 10.2.203.149 |
| 76 | 10.2.203.150/31 | 10.2.203.150 – 10.2.203.151 | 10.2.203.151 |
| 77 | 10.2.203.152/31 | 10.2.203.152 – 10.2.203.153 | 10.2.203.153 |
| 78 | 10.2.203.154/31 | 10.2.203.154 – 10.2.203.155 | 10.2.203.155 |
| 79 | 10.2.203.156/31 | 10.2.203.156 – 10.2.203.157 | 10.2.203.157 |
| 80 | 10.2.203.158/31 | 10.2.203.158 – 10.2.203.159 | 10.2.203.159 |
| 81 | 10.2.203.160/31 | 10.2.203.160 – 10.2.203.161 | 10.2.203.161 |
| 82 | 10.2.203.162/31 | 10.2.203.162 – 10.2.203.163 | 10.2.203.163 |
| 83 | 10.2.203.164/31 | 10.2.203.164 – 10.2.203.165 | 10.2.203.165 |
| 84 | 10.2.203.166/31 | 10.2.203.166 – 10.2.203.167 | 10.2.203.167 |
| 85 | 10.2.203.168/31 | 10.2.203.168 – 10.2.203.169 | 10.2.203.169 |
| 86 | 10.2.203.170/31 | 10.2.203.170 – 10.2.203.171 | 10.2.203.171 |
| 87 | 10.2.203.172/31 | 10.2.203.172 – 10.2.203.173 | 10.2.203.173 |
| 88 | 10.2.203.174/31 | 10.2.203.174 – 10.2.203.175 | 10.2.203.175 |
| 89 | 10.2.203.176/31 | 10.2.203.176 – 10.2.203.177 | 10.2.203.177 |
| 90 | 10.2.203.178/31 | 10.2.203.178 – 10.2.203.179 | 10.2.203.179 |
| 91 | 10.2.203.180/31 | 10.2.203.180 – 10.2.203.181 | 10.2.203.181 |
| 92 | 10.2.203.182/31 | 10.2.203.182 – 10.2.203.183 | 10.2.203.183 |
| 93 | 10.2.203.184/31 | 10.2.203.184 – 10.2.203.185 | 10.2.203.185 |
| 94 | 10.2.203.186/31 | 10.2.203.186 – 10.2.203.187 | 10.2.203.187 |
| 95 | 10.2.203.188/31 | 10.2.203.188 – 10.2.203.189 | 10.2.203.189 |
| 96 | 10.2.203.190/31 | 10.2.203.190 – 10.2.203.191 | 10.2.203.191 |
| 97 | 10.2.203.192/31 | 10.2.203.192 – 10.2.203.193 | 10.2.203.193 |
| 98 | 10.2.203.194/31 | 10.2.203.194 – 10.2.203.195 | 10.2.203.195 |
| 99 | 10.2.203.196/31 | 10.2.203.196 – 10.2.203.197 | 10.2.203.197 |
| 100 | 10.2.203.198/31 | 10.2.203.198 – 10.2.203.199 | 10.2.203.199 |
| 101 | 10.2.203.200/31 | 10.2.203.200 – 10.2.203.201 | 10.2.203.201 |
| 102 | 10.2.203.202/31 | 10.2.203.202 – 10.2.203.203 | 10.2.203.203 |
| 103 | 10.2.203.204/31 | 10.2.203.204 – 10.2.203.205 | 10.2.203.205 |
| 104 | 10.2.203.206/31 | 10.2.203.206 – 10.2.203.207 | 10.2.203.207 |
| 105 | 10.2.203.208/31 | 10.2.203.208 – 10.2.203.209 | 10.2.203.209 |
| 106 | 10.2.203.210/31 | 10.2.203.210 – 10.2.203.211 | 10.2.203.211 |
| 107 | 10.2.203.212/31 | 10.2.203.212 – 10.2.203.213 | 10.2.203.213 |
| 108 | 10.2.203.214/31 | 10.2.203.214 – 10.2.203.215 | 10.2.203.215 |
| 109 | 10.2.203.216/31 | 10.2.203.216 – 10.2.203.217 | 10.2.203.217 |
| 110 | 10.2.203.218/31 | 10.2.203.218 – 10.2.203.219 | 10.2.203.219 |
| 111 | 10.2.203.220/31 | 10.2.203.220 – 10.2.203.221 | 10.2.203.221 |
| 112 | 10.2.203.222/31 | 10.2.203.222 – 10.2.203.223 | 10.2.203.223 |
| 113 | 10.2.203.224/31 | 10.2.203.224 – 10.2.203.225 | 10.2.203.225 |
| 114 | 10.2.203.226/31 | 10.2.203.226 – 10.2.203.227 | 10.2.203.227 |
| 115 | 10.2.203.228/31 | 10.2.203.228 – 10.2.203.229 | 10.2.203.229 |
| 116 | 10.2.203.230/31 | 10.2.203.230 – 10.2.203.231 | 10.2.203.231 |
| 117 | 10.2.203.232/31 | 10.2.203.232 – 10.2.203.233 | 10.2.203.233 |
| 118 | 10.2.203.234/31 | 10.2.203.234 – 10.2.203.235 | 10.2.203.235 |
| 119 | 10.2.203.236/31 | 10.2.203.236 – 10.2.203.237 | 10.2.203.237 |
| 120 | 10.2.203.238/31 | 10.2.203.238 – 10.2.203.239 | 10.2.203.239 |
| 121 | 10.2.203.240/31 | 10.2.203.240 – 10.2.203.241 | 10.2.203.241 |
| 122 | 10.2.203.242/31 | 10.2.203.242 – 10.2.203.243 | 10.2.203.243 |
| 123 | 10.2.203.244/31 | 10.2.203.244 – 10.2.203.245 | 10.2.203.245 |
| 124 | 10.2.203.246/31 | 10.2.203.246 – 10.2.203.247 | 10.2.203.247 |
| 125 | 10.2.203.248/31 | 10.2.203.248 – 10.2.203.249 | 10.2.203.249 |
| 126 | 10.2.203.250/31 | 10.2.203.250 – 10.2.203.251 | 10.2.203.251 |
| 127 | 10.2.203.252/31 | 10.2.203.252 – 10.2.203.253 | 10.2.203.253 |
| 128 | 10.2.203.254/31 | 10.2.203.254 – 10.2.203.255 | 10.2.203.255 |
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.