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)10.87.90.0/23
network10.87.90.0/23
broadcast10.87.91.255
first host10.87.90.1
last host10.87.91.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.87.90.0/23
address00001010.01010111.01011010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01010111.01011010.00000000
broadcast00001010.01010111.01011011.11111111
green = network part, grey = host part
hex0x0a575a00
decimal173496832
reverse dns0.90.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:5a00
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.87.90.0/30 | 10.87.90.1 – 10.87.90.2 | 10.87.90.3 |
| 2 | 10.87.90.4/30 | 10.87.90.5 – 10.87.90.6 | 10.87.90.7 |
| 3 | 10.87.90.8/30 | 10.87.90.9 – 10.87.90.10 | 10.87.90.11 |
| 4 | 10.87.90.12/30 | 10.87.90.13 – 10.87.90.14 | 10.87.90.15 |
| 5 | 10.87.90.16/30 | 10.87.90.17 – 10.87.90.18 | 10.87.90.19 |
| 6 | 10.87.90.20/30 | 10.87.90.21 – 10.87.90.22 | 10.87.90.23 |
| 7 | 10.87.90.24/30 | 10.87.90.25 – 10.87.90.26 | 10.87.90.27 |
| 8 | 10.87.90.28/30 | 10.87.90.29 – 10.87.90.30 | 10.87.90.31 |
| 9 | 10.87.90.32/30 | 10.87.90.33 – 10.87.90.34 | 10.87.90.35 |
| 10 | 10.87.90.36/30 | 10.87.90.37 – 10.87.90.38 | 10.87.90.39 |
| 11 | 10.87.90.40/30 | 10.87.90.41 – 10.87.90.42 | 10.87.90.43 |
| 12 | 10.87.90.44/30 | 10.87.90.45 – 10.87.90.46 | 10.87.90.47 |
| 13 | 10.87.90.48/30 | 10.87.90.49 – 10.87.90.50 | 10.87.90.51 |
| 14 | 10.87.90.52/30 | 10.87.90.53 – 10.87.90.54 | 10.87.90.55 |
| 15 | 10.87.90.56/30 | 10.87.90.57 – 10.87.90.58 | 10.87.90.59 |
| 16 | 10.87.90.60/30 | 10.87.90.61 – 10.87.90.62 | 10.87.90.63 |
| 17 | 10.87.90.64/30 | 10.87.90.65 – 10.87.90.66 | 10.87.90.67 |
| 18 | 10.87.90.68/30 | 10.87.90.69 – 10.87.90.70 | 10.87.90.71 |
| 19 | 10.87.90.72/30 | 10.87.90.73 – 10.87.90.74 | 10.87.90.75 |
| 20 | 10.87.90.76/30 | 10.87.90.77 – 10.87.90.78 | 10.87.90.79 |
| 21 | 10.87.90.80/30 | 10.87.90.81 – 10.87.90.82 | 10.87.90.83 |
| 22 | 10.87.90.84/30 | 10.87.90.85 – 10.87.90.86 | 10.87.90.87 |
| 23 | 10.87.90.88/30 | 10.87.90.89 – 10.87.90.90 | 10.87.90.91 |
| 24 | 10.87.90.92/30 | 10.87.90.93 – 10.87.90.94 | 10.87.90.95 |
| 25 | 10.87.90.96/30 | 10.87.90.97 – 10.87.90.98 | 10.87.90.99 |
| 26 | 10.87.90.100/30 | 10.87.90.101 – 10.87.90.102 | 10.87.90.103 |
| 27 | 10.87.90.104/30 | 10.87.90.105 – 10.87.90.106 | 10.87.90.107 |
| 28 | 10.87.90.108/30 | 10.87.90.109 – 10.87.90.110 | 10.87.90.111 |
| 29 | 10.87.90.112/30 | 10.87.90.113 – 10.87.90.114 | 10.87.90.115 |
| 30 | 10.87.90.116/30 | 10.87.90.117 – 10.87.90.118 | 10.87.90.119 |
| 31 | 10.87.90.120/30 | 10.87.90.121 – 10.87.90.122 | 10.87.90.123 |
| 32 | 10.87.90.124/30 | 10.87.90.125 – 10.87.90.126 | 10.87.90.127 |
| 33 | 10.87.90.128/30 | 10.87.90.129 – 10.87.90.130 | 10.87.90.131 |
| 34 | 10.87.90.132/30 | 10.87.90.133 – 10.87.90.134 | 10.87.90.135 |
| 35 | 10.87.90.136/30 | 10.87.90.137 – 10.87.90.138 | 10.87.90.139 |
| 36 | 10.87.90.140/30 | 10.87.90.141 – 10.87.90.142 | 10.87.90.143 |
| 37 | 10.87.90.144/30 | 10.87.90.145 – 10.87.90.146 | 10.87.90.147 |
| 38 | 10.87.90.148/30 | 10.87.90.149 – 10.87.90.150 | 10.87.90.151 |
| 39 | 10.87.90.152/30 | 10.87.90.153 – 10.87.90.154 | 10.87.90.155 |
| 40 | 10.87.90.156/30 | 10.87.90.157 – 10.87.90.158 | 10.87.90.159 |
| 41 | 10.87.90.160/30 | 10.87.90.161 – 10.87.90.162 | 10.87.90.163 |
| 42 | 10.87.90.164/30 | 10.87.90.165 – 10.87.90.166 | 10.87.90.167 |
| 43 | 10.87.90.168/30 | 10.87.90.169 – 10.87.90.170 | 10.87.90.171 |
| 44 | 10.87.90.172/30 | 10.87.90.173 – 10.87.90.174 | 10.87.90.175 |
| 45 | 10.87.90.176/30 | 10.87.90.177 – 10.87.90.178 | 10.87.90.179 |
| 46 | 10.87.90.180/30 | 10.87.90.181 – 10.87.90.182 | 10.87.90.183 |
| 47 | 10.87.90.184/30 | 10.87.90.185 – 10.87.90.186 | 10.87.90.187 |
| 48 | 10.87.90.188/30 | 10.87.90.189 – 10.87.90.190 | 10.87.90.191 |
| 49 | 10.87.90.192/30 | 10.87.90.193 – 10.87.90.194 | 10.87.90.195 |
| 50 | 10.87.90.196/30 | 10.87.90.197 – 10.87.90.198 | 10.87.90.199 |
| 51 | 10.87.90.200/30 | 10.87.90.201 – 10.87.90.202 | 10.87.90.203 |
| 52 | 10.87.90.204/30 | 10.87.90.205 – 10.87.90.206 | 10.87.90.207 |
| 53 | 10.87.90.208/30 | 10.87.90.209 – 10.87.90.210 | 10.87.90.211 |
| 54 | 10.87.90.212/30 | 10.87.90.213 – 10.87.90.214 | 10.87.90.215 |
| 55 | 10.87.90.216/30 | 10.87.90.217 – 10.87.90.218 | 10.87.90.219 |
| 56 | 10.87.90.220/30 | 10.87.90.221 – 10.87.90.222 | 10.87.90.223 |
| 57 | 10.87.90.224/30 | 10.87.90.225 – 10.87.90.226 | 10.87.90.227 |
| 58 | 10.87.90.228/30 | 10.87.90.229 – 10.87.90.230 | 10.87.90.231 |
| 59 | 10.87.90.232/30 | 10.87.90.233 – 10.87.90.234 | 10.87.90.235 |
| 60 | 10.87.90.236/30 | 10.87.90.237 – 10.87.90.238 | 10.87.90.239 |
| 61 | 10.87.90.240/30 | 10.87.90.241 – 10.87.90.242 | 10.87.90.243 |
| 62 | 10.87.90.244/30 | 10.87.90.245 – 10.87.90.246 | 10.87.90.247 |
| 63 | 10.87.90.248/30 | 10.87.90.249 – 10.87.90.250 | 10.87.90.251 |
| 64 | 10.87.90.252/30 | 10.87.90.253 – 10.87.90.254 | 10.87.90.255 |
| 65 | 10.87.91.0/30 | 10.87.91.1 – 10.87.91.2 | 10.87.91.3 |
| 66 | 10.87.91.4/30 | 10.87.91.5 – 10.87.91.6 | 10.87.91.7 |
| 67 | 10.87.91.8/30 | 10.87.91.9 – 10.87.91.10 | 10.87.91.11 |
| 68 | 10.87.91.12/30 | 10.87.91.13 – 10.87.91.14 | 10.87.91.15 |
| 69 | 10.87.91.16/30 | 10.87.91.17 – 10.87.91.18 | 10.87.91.19 |
| 70 | 10.87.91.20/30 | 10.87.91.21 – 10.87.91.22 | 10.87.91.23 |
| 71 | 10.87.91.24/30 | 10.87.91.25 – 10.87.91.26 | 10.87.91.27 |
| 72 | 10.87.91.28/30 | 10.87.91.29 – 10.87.91.30 | 10.87.91.31 |
| 73 | 10.87.91.32/30 | 10.87.91.33 – 10.87.91.34 | 10.87.91.35 |
| 74 | 10.87.91.36/30 | 10.87.91.37 – 10.87.91.38 | 10.87.91.39 |
| 75 | 10.87.91.40/30 | 10.87.91.41 – 10.87.91.42 | 10.87.91.43 |
| 76 | 10.87.91.44/30 | 10.87.91.45 – 10.87.91.46 | 10.87.91.47 |
| 77 | 10.87.91.48/30 | 10.87.91.49 – 10.87.91.50 | 10.87.91.51 |
| 78 | 10.87.91.52/30 | 10.87.91.53 – 10.87.91.54 | 10.87.91.55 |
| 79 | 10.87.91.56/30 | 10.87.91.57 – 10.87.91.58 | 10.87.91.59 |
| 80 | 10.87.91.60/30 | 10.87.91.61 – 10.87.91.62 | 10.87.91.63 |
| 81 | 10.87.91.64/30 | 10.87.91.65 – 10.87.91.66 | 10.87.91.67 |
| 82 | 10.87.91.68/30 | 10.87.91.69 – 10.87.91.70 | 10.87.91.71 |
| 83 | 10.87.91.72/30 | 10.87.91.73 – 10.87.91.74 | 10.87.91.75 |
| 84 | 10.87.91.76/30 | 10.87.91.77 – 10.87.91.78 | 10.87.91.79 |
| 85 | 10.87.91.80/30 | 10.87.91.81 – 10.87.91.82 | 10.87.91.83 |
| 86 | 10.87.91.84/30 | 10.87.91.85 – 10.87.91.86 | 10.87.91.87 |
| 87 | 10.87.91.88/30 | 10.87.91.89 – 10.87.91.90 | 10.87.91.91 |
| 88 | 10.87.91.92/30 | 10.87.91.93 – 10.87.91.94 | 10.87.91.95 |
| 89 | 10.87.91.96/30 | 10.87.91.97 – 10.87.91.98 | 10.87.91.99 |
| 90 | 10.87.91.100/30 | 10.87.91.101 – 10.87.91.102 | 10.87.91.103 |
| 91 | 10.87.91.104/30 | 10.87.91.105 – 10.87.91.106 | 10.87.91.107 |
| 92 | 10.87.91.108/30 | 10.87.91.109 – 10.87.91.110 | 10.87.91.111 |
| 93 | 10.87.91.112/30 | 10.87.91.113 – 10.87.91.114 | 10.87.91.115 |
| 94 | 10.87.91.116/30 | 10.87.91.117 – 10.87.91.118 | 10.87.91.119 |
| 95 | 10.87.91.120/30 | 10.87.91.121 – 10.87.91.122 | 10.87.91.123 |
| 96 | 10.87.91.124/30 | 10.87.91.125 – 10.87.91.126 | 10.87.91.127 |
| 97 | 10.87.91.128/30 | 10.87.91.129 – 10.87.91.130 | 10.87.91.131 |
| 98 | 10.87.91.132/30 | 10.87.91.133 – 10.87.91.134 | 10.87.91.135 |
| 99 | 10.87.91.136/30 | 10.87.91.137 – 10.87.91.138 | 10.87.91.139 |
| 100 | 10.87.91.140/30 | 10.87.91.141 – 10.87.91.142 | 10.87.91.143 |
| 101 | 10.87.91.144/30 | 10.87.91.145 – 10.87.91.146 | 10.87.91.147 |
| 102 | 10.87.91.148/30 | 10.87.91.149 – 10.87.91.150 | 10.87.91.151 |
| 103 | 10.87.91.152/30 | 10.87.91.153 – 10.87.91.154 | 10.87.91.155 |
| 104 | 10.87.91.156/30 | 10.87.91.157 – 10.87.91.158 | 10.87.91.159 |
| 105 | 10.87.91.160/30 | 10.87.91.161 – 10.87.91.162 | 10.87.91.163 |
| 106 | 10.87.91.164/30 | 10.87.91.165 – 10.87.91.166 | 10.87.91.167 |
| 107 | 10.87.91.168/30 | 10.87.91.169 – 10.87.91.170 | 10.87.91.171 |
| 108 | 10.87.91.172/30 | 10.87.91.173 – 10.87.91.174 | 10.87.91.175 |
| 109 | 10.87.91.176/30 | 10.87.91.177 – 10.87.91.178 | 10.87.91.179 |
| 110 | 10.87.91.180/30 | 10.87.91.181 – 10.87.91.182 | 10.87.91.183 |
| 111 | 10.87.91.184/30 | 10.87.91.185 – 10.87.91.186 | 10.87.91.187 |
| 112 | 10.87.91.188/30 | 10.87.91.189 – 10.87.91.190 | 10.87.91.191 |
| 113 | 10.87.91.192/30 | 10.87.91.193 – 10.87.91.194 | 10.87.91.195 |
| 114 | 10.87.91.196/30 | 10.87.91.197 – 10.87.91.198 | 10.87.91.199 |
| 115 | 10.87.91.200/30 | 10.87.91.201 – 10.87.91.202 | 10.87.91.203 |
| 116 | 10.87.91.204/30 | 10.87.91.205 – 10.87.91.206 | 10.87.91.207 |
| 117 | 10.87.91.208/30 | 10.87.91.209 – 10.87.91.210 | 10.87.91.211 |
| 118 | 10.87.91.212/30 | 10.87.91.213 – 10.87.91.214 | 10.87.91.215 |
| 119 | 10.87.91.216/30 | 10.87.91.217 – 10.87.91.218 | 10.87.91.219 |
| 120 | 10.87.91.220/30 | 10.87.91.221 – 10.87.91.222 | 10.87.91.223 |
| 121 | 10.87.91.224/30 | 10.87.91.225 – 10.87.91.226 | 10.87.91.227 |
| 122 | 10.87.91.228/30 | 10.87.91.229 – 10.87.91.230 | 10.87.91.231 |
| 123 | 10.87.91.232/30 | 10.87.91.233 – 10.87.91.234 | 10.87.91.235 |
| 124 | 10.87.91.236/30 | 10.87.91.237 – 10.87.91.238 | 10.87.91.239 |
| 125 | 10.87.91.240/30 | 10.87.91.241 – 10.87.91.242 | 10.87.91.243 |
| 126 | 10.87.91.244/30 | 10.87.91.245 – 10.87.91.246 | 10.87.91.247 |
| 127 | 10.87.91.248/30 | 10.87.91.249 – 10.87.91.250 | 10.87.91.251 |
| 128 | 10.87.91.252/30 | 10.87.91.253 – 10.87.91.254 | 10.87.91.255 |
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.