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)10.129.78.0/23
network10.129.78.0/23
broadcast10.129.79.255
first host10.129.78.1
last host10.129.79.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.129.78.0/23
address00001010.10000001.01001110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10000001.01001110.00000000
broadcast00001010.10000001.01001111.11111111
green = network part, grey = host part
hex0x0a814e00
decimal176246272
reverse dns0.78.129.10.in-addr.arpa
ipv4-mapped::ffff:a81:4e00
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.129.78.0/30 | 10.129.78.1 – 10.129.78.2 | 10.129.78.3 |
| 2 | 10.129.78.4/30 | 10.129.78.5 – 10.129.78.6 | 10.129.78.7 |
| 3 | 10.129.78.8/30 | 10.129.78.9 – 10.129.78.10 | 10.129.78.11 |
| 4 | 10.129.78.12/30 | 10.129.78.13 – 10.129.78.14 | 10.129.78.15 |
| 5 | 10.129.78.16/30 | 10.129.78.17 – 10.129.78.18 | 10.129.78.19 |
| 6 | 10.129.78.20/30 | 10.129.78.21 – 10.129.78.22 | 10.129.78.23 |
| 7 | 10.129.78.24/30 | 10.129.78.25 – 10.129.78.26 | 10.129.78.27 |
| 8 | 10.129.78.28/30 | 10.129.78.29 – 10.129.78.30 | 10.129.78.31 |
| 9 | 10.129.78.32/30 | 10.129.78.33 – 10.129.78.34 | 10.129.78.35 |
| 10 | 10.129.78.36/30 | 10.129.78.37 – 10.129.78.38 | 10.129.78.39 |
| 11 | 10.129.78.40/30 | 10.129.78.41 – 10.129.78.42 | 10.129.78.43 |
| 12 | 10.129.78.44/30 | 10.129.78.45 – 10.129.78.46 | 10.129.78.47 |
| 13 | 10.129.78.48/30 | 10.129.78.49 – 10.129.78.50 | 10.129.78.51 |
| 14 | 10.129.78.52/30 | 10.129.78.53 – 10.129.78.54 | 10.129.78.55 |
| 15 | 10.129.78.56/30 | 10.129.78.57 – 10.129.78.58 | 10.129.78.59 |
| 16 | 10.129.78.60/30 | 10.129.78.61 – 10.129.78.62 | 10.129.78.63 |
| 17 | 10.129.78.64/30 | 10.129.78.65 – 10.129.78.66 | 10.129.78.67 |
| 18 | 10.129.78.68/30 | 10.129.78.69 – 10.129.78.70 | 10.129.78.71 |
| 19 | 10.129.78.72/30 | 10.129.78.73 – 10.129.78.74 | 10.129.78.75 |
| 20 | 10.129.78.76/30 | 10.129.78.77 – 10.129.78.78 | 10.129.78.79 |
| 21 | 10.129.78.80/30 | 10.129.78.81 – 10.129.78.82 | 10.129.78.83 |
| 22 | 10.129.78.84/30 | 10.129.78.85 – 10.129.78.86 | 10.129.78.87 |
| 23 | 10.129.78.88/30 | 10.129.78.89 – 10.129.78.90 | 10.129.78.91 |
| 24 | 10.129.78.92/30 | 10.129.78.93 – 10.129.78.94 | 10.129.78.95 |
| 25 | 10.129.78.96/30 | 10.129.78.97 – 10.129.78.98 | 10.129.78.99 |
| 26 | 10.129.78.100/30 | 10.129.78.101 – 10.129.78.102 | 10.129.78.103 |
| 27 | 10.129.78.104/30 | 10.129.78.105 – 10.129.78.106 | 10.129.78.107 |
| 28 | 10.129.78.108/30 | 10.129.78.109 – 10.129.78.110 | 10.129.78.111 |
| 29 | 10.129.78.112/30 | 10.129.78.113 – 10.129.78.114 | 10.129.78.115 |
| 30 | 10.129.78.116/30 | 10.129.78.117 – 10.129.78.118 | 10.129.78.119 |
| 31 | 10.129.78.120/30 | 10.129.78.121 – 10.129.78.122 | 10.129.78.123 |
| 32 | 10.129.78.124/30 | 10.129.78.125 – 10.129.78.126 | 10.129.78.127 |
| 33 | 10.129.78.128/30 | 10.129.78.129 – 10.129.78.130 | 10.129.78.131 |
| 34 | 10.129.78.132/30 | 10.129.78.133 – 10.129.78.134 | 10.129.78.135 |
| 35 | 10.129.78.136/30 | 10.129.78.137 – 10.129.78.138 | 10.129.78.139 |
| 36 | 10.129.78.140/30 | 10.129.78.141 – 10.129.78.142 | 10.129.78.143 |
| 37 | 10.129.78.144/30 | 10.129.78.145 – 10.129.78.146 | 10.129.78.147 |
| 38 | 10.129.78.148/30 | 10.129.78.149 – 10.129.78.150 | 10.129.78.151 |
| 39 | 10.129.78.152/30 | 10.129.78.153 – 10.129.78.154 | 10.129.78.155 |
| 40 | 10.129.78.156/30 | 10.129.78.157 – 10.129.78.158 | 10.129.78.159 |
| 41 | 10.129.78.160/30 | 10.129.78.161 – 10.129.78.162 | 10.129.78.163 |
| 42 | 10.129.78.164/30 | 10.129.78.165 – 10.129.78.166 | 10.129.78.167 |
| 43 | 10.129.78.168/30 | 10.129.78.169 – 10.129.78.170 | 10.129.78.171 |
| 44 | 10.129.78.172/30 | 10.129.78.173 – 10.129.78.174 | 10.129.78.175 |
| 45 | 10.129.78.176/30 | 10.129.78.177 – 10.129.78.178 | 10.129.78.179 |
| 46 | 10.129.78.180/30 | 10.129.78.181 – 10.129.78.182 | 10.129.78.183 |
| 47 | 10.129.78.184/30 | 10.129.78.185 – 10.129.78.186 | 10.129.78.187 |
| 48 | 10.129.78.188/30 | 10.129.78.189 – 10.129.78.190 | 10.129.78.191 |
| 49 | 10.129.78.192/30 | 10.129.78.193 – 10.129.78.194 | 10.129.78.195 |
| 50 | 10.129.78.196/30 | 10.129.78.197 – 10.129.78.198 | 10.129.78.199 |
| 51 | 10.129.78.200/30 | 10.129.78.201 – 10.129.78.202 | 10.129.78.203 |
| 52 | 10.129.78.204/30 | 10.129.78.205 – 10.129.78.206 | 10.129.78.207 |
| 53 | 10.129.78.208/30 | 10.129.78.209 – 10.129.78.210 | 10.129.78.211 |
| 54 | 10.129.78.212/30 | 10.129.78.213 – 10.129.78.214 | 10.129.78.215 |
| 55 | 10.129.78.216/30 | 10.129.78.217 – 10.129.78.218 | 10.129.78.219 |
| 56 | 10.129.78.220/30 | 10.129.78.221 – 10.129.78.222 | 10.129.78.223 |
| 57 | 10.129.78.224/30 | 10.129.78.225 – 10.129.78.226 | 10.129.78.227 |
| 58 | 10.129.78.228/30 | 10.129.78.229 – 10.129.78.230 | 10.129.78.231 |
| 59 | 10.129.78.232/30 | 10.129.78.233 – 10.129.78.234 | 10.129.78.235 |
| 60 | 10.129.78.236/30 | 10.129.78.237 – 10.129.78.238 | 10.129.78.239 |
| 61 | 10.129.78.240/30 | 10.129.78.241 – 10.129.78.242 | 10.129.78.243 |
| 62 | 10.129.78.244/30 | 10.129.78.245 – 10.129.78.246 | 10.129.78.247 |
| 63 | 10.129.78.248/30 | 10.129.78.249 – 10.129.78.250 | 10.129.78.251 |
| 64 | 10.129.78.252/30 | 10.129.78.253 – 10.129.78.254 | 10.129.78.255 |
| 65 | 10.129.79.0/30 | 10.129.79.1 – 10.129.79.2 | 10.129.79.3 |
| 66 | 10.129.79.4/30 | 10.129.79.5 – 10.129.79.6 | 10.129.79.7 |
| 67 | 10.129.79.8/30 | 10.129.79.9 – 10.129.79.10 | 10.129.79.11 |
| 68 | 10.129.79.12/30 | 10.129.79.13 – 10.129.79.14 | 10.129.79.15 |
| 69 | 10.129.79.16/30 | 10.129.79.17 – 10.129.79.18 | 10.129.79.19 |
| 70 | 10.129.79.20/30 | 10.129.79.21 – 10.129.79.22 | 10.129.79.23 |
| 71 | 10.129.79.24/30 | 10.129.79.25 – 10.129.79.26 | 10.129.79.27 |
| 72 | 10.129.79.28/30 | 10.129.79.29 – 10.129.79.30 | 10.129.79.31 |
| 73 | 10.129.79.32/30 | 10.129.79.33 – 10.129.79.34 | 10.129.79.35 |
| 74 | 10.129.79.36/30 | 10.129.79.37 – 10.129.79.38 | 10.129.79.39 |
| 75 | 10.129.79.40/30 | 10.129.79.41 – 10.129.79.42 | 10.129.79.43 |
| 76 | 10.129.79.44/30 | 10.129.79.45 – 10.129.79.46 | 10.129.79.47 |
| 77 | 10.129.79.48/30 | 10.129.79.49 – 10.129.79.50 | 10.129.79.51 |
| 78 | 10.129.79.52/30 | 10.129.79.53 – 10.129.79.54 | 10.129.79.55 |
| 79 | 10.129.79.56/30 | 10.129.79.57 – 10.129.79.58 | 10.129.79.59 |
| 80 | 10.129.79.60/30 | 10.129.79.61 – 10.129.79.62 | 10.129.79.63 |
| 81 | 10.129.79.64/30 | 10.129.79.65 – 10.129.79.66 | 10.129.79.67 |
| 82 | 10.129.79.68/30 | 10.129.79.69 – 10.129.79.70 | 10.129.79.71 |
| 83 | 10.129.79.72/30 | 10.129.79.73 – 10.129.79.74 | 10.129.79.75 |
| 84 | 10.129.79.76/30 | 10.129.79.77 – 10.129.79.78 | 10.129.79.79 |
| 85 | 10.129.79.80/30 | 10.129.79.81 – 10.129.79.82 | 10.129.79.83 |
| 86 | 10.129.79.84/30 | 10.129.79.85 – 10.129.79.86 | 10.129.79.87 |
| 87 | 10.129.79.88/30 | 10.129.79.89 – 10.129.79.90 | 10.129.79.91 |
| 88 | 10.129.79.92/30 | 10.129.79.93 – 10.129.79.94 | 10.129.79.95 |
| 89 | 10.129.79.96/30 | 10.129.79.97 – 10.129.79.98 | 10.129.79.99 |
| 90 | 10.129.79.100/30 | 10.129.79.101 – 10.129.79.102 | 10.129.79.103 |
| 91 | 10.129.79.104/30 | 10.129.79.105 – 10.129.79.106 | 10.129.79.107 |
| 92 | 10.129.79.108/30 | 10.129.79.109 – 10.129.79.110 | 10.129.79.111 |
| 93 | 10.129.79.112/30 | 10.129.79.113 – 10.129.79.114 | 10.129.79.115 |
| 94 | 10.129.79.116/30 | 10.129.79.117 – 10.129.79.118 | 10.129.79.119 |
| 95 | 10.129.79.120/30 | 10.129.79.121 – 10.129.79.122 | 10.129.79.123 |
| 96 | 10.129.79.124/30 | 10.129.79.125 – 10.129.79.126 | 10.129.79.127 |
| 97 | 10.129.79.128/30 | 10.129.79.129 – 10.129.79.130 | 10.129.79.131 |
| 98 | 10.129.79.132/30 | 10.129.79.133 – 10.129.79.134 | 10.129.79.135 |
| 99 | 10.129.79.136/30 | 10.129.79.137 – 10.129.79.138 | 10.129.79.139 |
| 100 | 10.129.79.140/30 | 10.129.79.141 – 10.129.79.142 | 10.129.79.143 |
| 101 | 10.129.79.144/30 | 10.129.79.145 – 10.129.79.146 | 10.129.79.147 |
| 102 | 10.129.79.148/30 | 10.129.79.149 – 10.129.79.150 | 10.129.79.151 |
| 103 | 10.129.79.152/30 | 10.129.79.153 – 10.129.79.154 | 10.129.79.155 |
| 104 | 10.129.79.156/30 | 10.129.79.157 – 10.129.79.158 | 10.129.79.159 |
| 105 | 10.129.79.160/30 | 10.129.79.161 – 10.129.79.162 | 10.129.79.163 |
| 106 | 10.129.79.164/30 | 10.129.79.165 – 10.129.79.166 | 10.129.79.167 |
| 107 | 10.129.79.168/30 | 10.129.79.169 – 10.129.79.170 | 10.129.79.171 |
| 108 | 10.129.79.172/30 | 10.129.79.173 – 10.129.79.174 | 10.129.79.175 |
| 109 | 10.129.79.176/30 | 10.129.79.177 – 10.129.79.178 | 10.129.79.179 |
| 110 | 10.129.79.180/30 | 10.129.79.181 – 10.129.79.182 | 10.129.79.183 |
| 111 | 10.129.79.184/30 | 10.129.79.185 – 10.129.79.186 | 10.129.79.187 |
| 112 | 10.129.79.188/30 | 10.129.79.189 – 10.129.79.190 | 10.129.79.191 |
| 113 | 10.129.79.192/30 | 10.129.79.193 – 10.129.79.194 | 10.129.79.195 |
| 114 | 10.129.79.196/30 | 10.129.79.197 – 10.129.79.198 | 10.129.79.199 |
| 115 | 10.129.79.200/30 | 10.129.79.201 – 10.129.79.202 | 10.129.79.203 |
| 116 | 10.129.79.204/30 | 10.129.79.205 – 10.129.79.206 | 10.129.79.207 |
| 117 | 10.129.79.208/30 | 10.129.79.209 – 10.129.79.210 | 10.129.79.211 |
| 118 | 10.129.79.212/30 | 10.129.79.213 – 10.129.79.214 | 10.129.79.215 |
| 119 | 10.129.79.216/30 | 10.129.79.217 – 10.129.79.218 | 10.129.79.219 |
| 120 | 10.129.79.220/30 | 10.129.79.221 – 10.129.79.222 | 10.129.79.223 |
| 121 | 10.129.79.224/30 | 10.129.79.225 – 10.129.79.226 | 10.129.79.227 |
| 122 | 10.129.79.228/30 | 10.129.79.229 – 10.129.79.230 | 10.129.79.231 |
| 123 | 10.129.79.232/30 | 10.129.79.233 – 10.129.79.234 | 10.129.79.235 |
| 124 | 10.129.79.236/30 | 10.129.79.237 – 10.129.79.238 | 10.129.79.239 |
| 125 | 10.129.79.240/30 | 10.129.79.241 – 10.129.79.242 | 10.129.79.243 |
| 126 | 10.129.79.244/30 | 10.129.79.245 – 10.129.79.246 | 10.129.79.247 |
| 127 | 10.129.79.248/30 | 10.129.79.249 – 10.129.79.250 | 10.129.79.251 |
| 128 | 10.129.79.252/30 | 10.129.79.253 – 10.129.79.254 | 10.129.79.255 |
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 /23 |
|---|---|---|---|---|
| /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 | 1 |
| /24 | 255.255.255.0 | 256 | 254 | 2 split → |
| /25 | 255.255.255.128 | 128 | 126 | 4 split → |
| /26 | 255.255.255.192 | 64 | 62 | 8 split → |
| /27 | 255.255.255.224 | 32 | 30 | 16 split → |
| /28 | 255.255.255.240 | 16 | 14 | 32 split → |
| /29 | 255.255.255.248 | 8 | 6 | 64 split → |
| /30 | 255.255.255.252 | 4 | 2 | 128 split → |
| /31 | 255.255.255.254 | 2 | 2 | 256 split → |
| /32 | 255.255.255.255 | 1 | 1 | 512 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.