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)10.7.18.0/23
network10.7.18.0/23
broadcast10.7.19.255
first host10.7.18.1
last host10.7.19.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.7.18.0/23
address00001010.00000111.00010010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000111.00010010.00000000
broadcast00001010.00000111.00010011.11111111
green = network part, grey = host part
hex0x0a071200
decimal168235520
reverse dns0.18.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:1200
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.7.18.0/30 | 10.7.18.1 – 10.7.18.2 | 10.7.18.3 |
| 2 | 10.7.18.4/30 | 10.7.18.5 – 10.7.18.6 | 10.7.18.7 |
| 3 | 10.7.18.8/30 | 10.7.18.9 – 10.7.18.10 | 10.7.18.11 |
| 4 | 10.7.18.12/30 | 10.7.18.13 – 10.7.18.14 | 10.7.18.15 |
| 5 | 10.7.18.16/30 | 10.7.18.17 – 10.7.18.18 | 10.7.18.19 |
| 6 | 10.7.18.20/30 | 10.7.18.21 – 10.7.18.22 | 10.7.18.23 |
| 7 | 10.7.18.24/30 | 10.7.18.25 – 10.7.18.26 | 10.7.18.27 |
| 8 | 10.7.18.28/30 | 10.7.18.29 – 10.7.18.30 | 10.7.18.31 |
| 9 | 10.7.18.32/30 | 10.7.18.33 – 10.7.18.34 | 10.7.18.35 |
| 10 | 10.7.18.36/30 | 10.7.18.37 – 10.7.18.38 | 10.7.18.39 |
| 11 | 10.7.18.40/30 | 10.7.18.41 – 10.7.18.42 | 10.7.18.43 |
| 12 | 10.7.18.44/30 | 10.7.18.45 – 10.7.18.46 | 10.7.18.47 |
| 13 | 10.7.18.48/30 | 10.7.18.49 – 10.7.18.50 | 10.7.18.51 |
| 14 | 10.7.18.52/30 | 10.7.18.53 – 10.7.18.54 | 10.7.18.55 |
| 15 | 10.7.18.56/30 | 10.7.18.57 – 10.7.18.58 | 10.7.18.59 |
| 16 | 10.7.18.60/30 | 10.7.18.61 – 10.7.18.62 | 10.7.18.63 |
| 17 | 10.7.18.64/30 | 10.7.18.65 – 10.7.18.66 | 10.7.18.67 |
| 18 | 10.7.18.68/30 | 10.7.18.69 – 10.7.18.70 | 10.7.18.71 |
| 19 | 10.7.18.72/30 | 10.7.18.73 – 10.7.18.74 | 10.7.18.75 |
| 20 | 10.7.18.76/30 | 10.7.18.77 – 10.7.18.78 | 10.7.18.79 |
| 21 | 10.7.18.80/30 | 10.7.18.81 – 10.7.18.82 | 10.7.18.83 |
| 22 | 10.7.18.84/30 | 10.7.18.85 – 10.7.18.86 | 10.7.18.87 |
| 23 | 10.7.18.88/30 | 10.7.18.89 – 10.7.18.90 | 10.7.18.91 |
| 24 | 10.7.18.92/30 | 10.7.18.93 – 10.7.18.94 | 10.7.18.95 |
| 25 | 10.7.18.96/30 | 10.7.18.97 – 10.7.18.98 | 10.7.18.99 |
| 26 | 10.7.18.100/30 | 10.7.18.101 – 10.7.18.102 | 10.7.18.103 |
| 27 | 10.7.18.104/30 | 10.7.18.105 – 10.7.18.106 | 10.7.18.107 |
| 28 | 10.7.18.108/30 | 10.7.18.109 – 10.7.18.110 | 10.7.18.111 |
| 29 | 10.7.18.112/30 | 10.7.18.113 – 10.7.18.114 | 10.7.18.115 |
| 30 | 10.7.18.116/30 | 10.7.18.117 – 10.7.18.118 | 10.7.18.119 |
| 31 | 10.7.18.120/30 | 10.7.18.121 – 10.7.18.122 | 10.7.18.123 |
| 32 | 10.7.18.124/30 | 10.7.18.125 – 10.7.18.126 | 10.7.18.127 |
| 33 | 10.7.18.128/30 | 10.7.18.129 – 10.7.18.130 | 10.7.18.131 |
| 34 | 10.7.18.132/30 | 10.7.18.133 – 10.7.18.134 | 10.7.18.135 |
| 35 | 10.7.18.136/30 | 10.7.18.137 – 10.7.18.138 | 10.7.18.139 |
| 36 | 10.7.18.140/30 | 10.7.18.141 – 10.7.18.142 | 10.7.18.143 |
| 37 | 10.7.18.144/30 | 10.7.18.145 – 10.7.18.146 | 10.7.18.147 |
| 38 | 10.7.18.148/30 | 10.7.18.149 – 10.7.18.150 | 10.7.18.151 |
| 39 | 10.7.18.152/30 | 10.7.18.153 – 10.7.18.154 | 10.7.18.155 |
| 40 | 10.7.18.156/30 | 10.7.18.157 – 10.7.18.158 | 10.7.18.159 |
| 41 | 10.7.18.160/30 | 10.7.18.161 – 10.7.18.162 | 10.7.18.163 |
| 42 | 10.7.18.164/30 | 10.7.18.165 – 10.7.18.166 | 10.7.18.167 |
| 43 | 10.7.18.168/30 | 10.7.18.169 – 10.7.18.170 | 10.7.18.171 |
| 44 | 10.7.18.172/30 | 10.7.18.173 – 10.7.18.174 | 10.7.18.175 |
| 45 | 10.7.18.176/30 | 10.7.18.177 – 10.7.18.178 | 10.7.18.179 |
| 46 | 10.7.18.180/30 | 10.7.18.181 – 10.7.18.182 | 10.7.18.183 |
| 47 | 10.7.18.184/30 | 10.7.18.185 – 10.7.18.186 | 10.7.18.187 |
| 48 | 10.7.18.188/30 | 10.7.18.189 – 10.7.18.190 | 10.7.18.191 |
| 49 | 10.7.18.192/30 | 10.7.18.193 – 10.7.18.194 | 10.7.18.195 |
| 50 | 10.7.18.196/30 | 10.7.18.197 – 10.7.18.198 | 10.7.18.199 |
| 51 | 10.7.18.200/30 | 10.7.18.201 – 10.7.18.202 | 10.7.18.203 |
| 52 | 10.7.18.204/30 | 10.7.18.205 – 10.7.18.206 | 10.7.18.207 |
| 53 | 10.7.18.208/30 | 10.7.18.209 – 10.7.18.210 | 10.7.18.211 |
| 54 | 10.7.18.212/30 | 10.7.18.213 – 10.7.18.214 | 10.7.18.215 |
| 55 | 10.7.18.216/30 | 10.7.18.217 – 10.7.18.218 | 10.7.18.219 |
| 56 | 10.7.18.220/30 | 10.7.18.221 – 10.7.18.222 | 10.7.18.223 |
| 57 | 10.7.18.224/30 | 10.7.18.225 – 10.7.18.226 | 10.7.18.227 |
| 58 | 10.7.18.228/30 | 10.7.18.229 – 10.7.18.230 | 10.7.18.231 |
| 59 | 10.7.18.232/30 | 10.7.18.233 – 10.7.18.234 | 10.7.18.235 |
| 60 | 10.7.18.236/30 | 10.7.18.237 – 10.7.18.238 | 10.7.18.239 |
| 61 | 10.7.18.240/30 | 10.7.18.241 – 10.7.18.242 | 10.7.18.243 |
| 62 | 10.7.18.244/30 | 10.7.18.245 – 10.7.18.246 | 10.7.18.247 |
| 63 | 10.7.18.248/30 | 10.7.18.249 – 10.7.18.250 | 10.7.18.251 |
| 64 | 10.7.18.252/30 | 10.7.18.253 – 10.7.18.254 | 10.7.18.255 |
| 65 | 10.7.19.0/30 | 10.7.19.1 – 10.7.19.2 | 10.7.19.3 |
| 66 | 10.7.19.4/30 | 10.7.19.5 – 10.7.19.6 | 10.7.19.7 |
| 67 | 10.7.19.8/30 | 10.7.19.9 – 10.7.19.10 | 10.7.19.11 |
| 68 | 10.7.19.12/30 | 10.7.19.13 – 10.7.19.14 | 10.7.19.15 |
| 69 | 10.7.19.16/30 | 10.7.19.17 – 10.7.19.18 | 10.7.19.19 |
| 70 | 10.7.19.20/30 | 10.7.19.21 – 10.7.19.22 | 10.7.19.23 |
| 71 | 10.7.19.24/30 | 10.7.19.25 – 10.7.19.26 | 10.7.19.27 |
| 72 | 10.7.19.28/30 | 10.7.19.29 – 10.7.19.30 | 10.7.19.31 |
| 73 | 10.7.19.32/30 | 10.7.19.33 – 10.7.19.34 | 10.7.19.35 |
| 74 | 10.7.19.36/30 | 10.7.19.37 – 10.7.19.38 | 10.7.19.39 |
| 75 | 10.7.19.40/30 | 10.7.19.41 – 10.7.19.42 | 10.7.19.43 |
| 76 | 10.7.19.44/30 | 10.7.19.45 – 10.7.19.46 | 10.7.19.47 |
| 77 | 10.7.19.48/30 | 10.7.19.49 – 10.7.19.50 | 10.7.19.51 |
| 78 | 10.7.19.52/30 | 10.7.19.53 – 10.7.19.54 | 10.7.19.55 |
| 79 | 10.7.19.56/30 | 10.7.19.57 – 10.7.19.58 | 10.7.19.59 |
| 80 | 10.7.19.60/30 | 10.7.19.61 – 10.7.19.62 | 10.7.19.63 |
| 81 | 10.7.19.64/30 | 10.7.19.65 – 10.7.19.66 | 10.7.19.67 |
| 82 | 10.7.19.68/30 | 10.7.19.69 – 10.7.19.70 | 10.7.19.71 |
| 83 | 10.7.19.72/30 | 10.7.19.73 – 10.7.19.74 | 10.7.19.75 |
| 84 | 10.7.19.76/30 | 10.7.19.77 – 10.7.19.78 | 10.7.19.79 |
| 85 | 10.7.19.80/30 | 10.7.19.81 – 10.7.19.82 | 10.7.19.83 |
| 86 | 10.7.19.84/30 | 10.7.19.85 – 10.7.19.86 | 10.7.19.87 |
| 87 | 10.7.19.88/30 | 10.7.19.89 – 10.7.19.90 | 10.7.19.91 |
| 88 | 10.7.19.92/30 | 10.7.19.93 – 10.7.19.94 | 10.7.19.95 |
| 89 | 10.7.19.96/30 | 10.7.19.97 – 10.7.19.98 | 10.7.19.99 |
| 90 | 10.7.19.100/30 | 10.7.19.101 – 10.7.19.102 | 10.7.19.103 |
| 91 | 10.7.19.104/30 | 10.7.19.105 – 10.7.19.106 | 10.7.19.107 |
| 92 | 10.7.19.108/30 | 10.7.19.109 – 10.7.19.110 | 10.7.19.111 |
| 93 | 10.7.19.112/30 | 10.7.19.113 – 10.7.19.114 | 10.7.19.115 |
| 94 | 10.7.19.116/30 | 10.7.19.117 – 10.7.19.118 | 10.7.19.119 |
| 95 | 10.7.19.120/30 | 10.7.19.121 – 10.7.19.122 | 10.7.19.123 |
| 96 | 10.7.19.124/30 | 10.7.19.125 – 10.7.19.126 | 10.7.19.127 |
| 97 | 10.7.19.128/30 | 10.7.19.129 – 10.7.19.130 | 10.7.19.131 |
| 98 | 10.7.19.132/30 | 10.7.19.133 – 10.7.19.134 | 10.7.19.135 |
| 99 | 10.7.19.136/30 | 10.7.19.137 – 10.7.19.138 | 10.7.19.139 |
| 100 | 10.7.19.140/30 | 10.7.19.141 – 10.7.19.142 | 10.7.19.143 |
| 101 | 10.7.19.144/30 | 10.7.19.145 – 10.7.19.146 | 10.7.19.147 |
| 102 | 10.7.19.148/30 | 10.7.19.149 – 10.7.19.150 | 10.7.19.151 |
| 103 | 10.7.19.152/30 | 10.7.19.153 – 10.7.19.154 | 10.7.19.155 |
| 104 | 10.7.19.156/30 | 10.7.19.157 – 10.7.19.158 | 10.7.19.159 |
| 105 | 10.7.19.160/30 | 10.7.19.161 – 10.7.19.162 | 10.7.19.163 |
| 106 | 10.7.19.164/30 | 10.7.19.165 – 10.7.19.166 | 10.7.19.167 |
| 107 | 10.7.19.168/30 | 10.7.19.169 – 10.7.19.170 | 10.7.19.171 |
| 108 | 10.7.19.172/30 | 10.7.19.173 – 10.7.19.174 | 10.7.19.175 |
| 109 | 10.7.19.176/30 | 10.7.19.177 – 10.7.19.178 | 10.7.19.179 |
| 110 | 10.7.19.180/30 | 10.7.19.181 – 10.7.19.182 | 10.7.19.183 |
| 111 | 10.7.19.184/30 | 10.7.19.185 – 10.7.19.186 | 10.7.19.187 |
| 112 | 10.7.19.188/30 | 10.7.19.189 – 10.7.19.190 | 10.7.19.191 |
| 113 | 10.7.19.192/30 | 10.7.19.193 – 10.7.19.194 | 10.7.19.195 |
| 114 | 10.7.19.196/30 | 10.7.19.197 – 10.7.19.198 | 10.7.19.199 |
| 115 | 10.7.19.200/30 | 10.7.19.201 – 10.7.19.202 | 10.7.19.203 |
| 116 | 10.7.19.204/30 | 10.7.19.205 – 10.7.19.206 | 10.7.19.207 |
| 117 | 10.7.19.208/30 | 10.7.19.209 – 10.7.19.210 | 10.7.19.211 |
| 118 | 10.7.19.212/30 | 10.7.19.213 – 10.7.19.214 | 10.7.19.215 |
| 119 | 10.7.19.216/30 | 10.7.19.217 – 10.7.19.218 | 10.7.19.219 |
| 120 | 10.7.19.220/30 | 10.7.19.221 – 10.7.19.222 | 10.7.19.223 |
| 121 | 10.7.19.224/30 | 10.7.19.225 – 10.7.19.226 | 10.7.19.227 |
| 122 | 10.7.19.228/30 | 10.7.19.229 – 10.7.19.230 | 10.7.19.231 |
| 123 | 10.7.19.232/30 | 10.7.19.233 – 10.7.19.234 | 10.7.19.235 |
| 124 | 10.7.19.236/30 | 10.7.19.237 – 10.7.19.238 | 10.7.19.239 |
| 125 | 10.7.19.240/30 | 10.7.19.241 – 10.7.19.242 | 10.7.19.243 |
| 126 | 10.7.19.244/30 | 10.7.19.245 – 10.7.19.246 | 10.7.19.247 |
| 127 | 10.7.19.248/30 | 10.7.19.249 – 10.7.19.250 | 10.7.19.251 |
| 128 | 10.7.19.252/30 | 10.7.19.253 – 10.7.19.254 | 10.7.19.255 |
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.