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)10.65.80.0/23
network10.65.80.0/23
broadcast10.65.81.255
first host10.65.80.1
last host10.65.81.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.65.80.0/23
address00001010.01000001.01010000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000001.01010000.00000000
broadcast00001010.01000001.01010001.11111111
green = network part, grey = host part
hex0x0a415000
decimal172052480
reverse dns0.80.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:5000
/23 split into /30 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.65.80.0/30 | 10.65.80.1 – 10.65.80.2 | 10.65.80.3 |
| 2 | 10.65.80.4/30 | 10.65.80.5 – 10.65.80.6 | 10.65.80.7 |
| 3 | 10.65.80.8/30 | 10.65.80.9 – 10.65.80.10 | 10.65.80.11 |
| 4 | 10.65.80.12/30 | 10.65.80.13 – 10.65.80.14 | 10.65.80.15 |
| 5 | 10.65.80.16/30 | 10.65.80.17 – 10.65.80.18 | 10.65.80.19 |
| 6 | 10.65.80.20/30 | 10.65.80.21 – 10.65.80.22 | 10.65.80.23 |
| 7 | 10.65.80.24/30 | 10.65.80.25 – 10.65.80.26 | 10.65.80.27 |
| 8 | 10.65.80.28/30 | 10.65.80.29 – 10.65.80.30 | 10.65.80.31 |
| 9 | 10.65.80.32/30 | 10.65.80.33 – 10.65.80.34 | 10.65.80.35 |
| 10 | 10.65.80.36/30 | 10.65.80.37 – 10.65.80.38 | 10.65.80.39 |
| 11 | 10.65.80.40/30 | 10.65.80.41 – 10.65.80.42 | 10.65.80.43 |
| 12 | 10.65.80.44/30 | 10.65.80.45 – 10.65.80.46 | 10.65.80.47 |
| 13 | 10.65.80.48/30 | 10.65.80.49 – 10.65.80.50 | 10.65.80.51 |
| 14 | 10.65.80.52/30 | 10.65.80.53 – 10.65.80.54 | 10.65.80.55 |
| 15 | 10.65.80.56/30 | 10.65.80.57 – 10.65.80.58 | 10.65.80.59 |
| 16 | 10.65.80.60/30 | 10.65.80.61 – 10.65.80.62 | 10.65.80.63 |
| 17 | 10.65.80.64/30 | 10.65.80.65 – 10.65.80.66 | 10.65.80.67 |
| 18 | 10.65.80.68/30 | 10.65.80.69 – 10.65.80.70 | 10.65.80.71 |
| 19 | 10.65.80.72/30 | 10.65.80.73 – 10.65.80.74 | 10.65.80.75 |
| 20 | 10.65.80.76/30 | 10.65.80.77 – 10.65.80.78 | 10.65.80.79 |
| 21 | 10.65.80.80/30 | 10.65.80.81 – 10.65.80.82 | 10.65.80.83 |
| 22 | 10.65.80.84/30 | 10.65.80.85 – 10.65.80.86 | 10.65.80.87 |
| 23 | 10.65.80.88/30 | 10.65.80.89 – 10.65.80.90 | 10.65.80.91 |
| 24 | 10.65.80.92/30 | 10.65.80.93 – 10.65.80.94 | 10.65.80.95 |
| 25 | 10.65.80.96/30 | 10.65.80.97 – 10.65.80.98 | 10.65.80.99 |
| 26 | 10.65.80.100/30 | 10.65.80.101 – 10.65.80.102 | 10.65.80.103 |
| 27 | 10.65.80.104/30 | 10.65.80.105 – 10.65.80.106 | 10.65.80.107 |
| 28 | 10.65.80.108/30 | 10.65.80.109 – 10.65.80.110 | 10.65.80.111 |
| 29 | 10.65.80.112/30 | 10.65.80.113 – 10.65.80.114 | 10.65.80.115 |
| 30 | 10.65.80.116/30 | 10.65.80.117 – 10.65.80.118 | 10.65.80.119 |
| 31 | 10.65.80.120/30 | 10.65.80.121 – 10.65.80.122 | 10.65.80.123 |
| 32 | 10.65.80.124/30 | 10.65.80.125 – 10.65.80.126 | 10.65.80.127 |
| 33 | 10.65.80.128/30 | 10.65.80.129 – 10.65.80.130 | 10.65.80.131 |
| 34 | 10.65.80.132/30 | 10.65.80.133 – 10.65.80.134 | 10.65.80.135 |
| 35 | 10.65.80.136/30 | 10.65.80.137 – 10.65.80.138 | 10.65.80.139 |
| 36 | 10.65.80.140/30 | 10.65.80.141 – 10.65.80.142 | 10.65.80.143 |
| 37 | 10.65.80.144/30 | 10.65.80.145 – 10.65.80.146 | 10.65.80.147 |
| 38 | 10.65.80.148/30 | 10.65.80.149 – 10.65.80.150 | 10.65.80.151 |
| 39 | 10.65.80.152/30 | 10.65.80.153 – 10.65.80.154 | 10.65.80.155 |
| 40 | 10.65.80.156/30 | 10.65.80.157 – 10.65.80.158 | 10.65.80.159 |
| 41 | 10.65.80.160/30 | 10.65.80.161 – 10.65.80.162 | 10.65.80.163 |
| 42 | 10.65.80.164/30 | 10.65.80.165 – 10.65.80.166 | 10.65.80.167 |
| 43 | 10.65.80.168/30 | 10.65.80.169 – 10.65.80.170 | 10.65.80.171 |
| 44 | 10.65.80.172/30 | 10.65.80.173 – 10.65.80.174 | 10.65.80.175 |
| 45 | 10.65.80.176/30 | 10.65.80.177 – 10.65.80.178 | 10.65.80.179 |
| 46 | 10.65.80.180/30 | 10.65.80.181 – 10.65.80.182 | 10.65.80.183 |
| 47 | 10.65.80.184/30 | 10.65.80.185 – 10.65.80.186 | 10.65.80.187 |
| 48 | 10.65.80.188/30 | 10.65.80.189 – 10.65.80.190 | 10.65.80.191 |
| 49 | 10.65.80.192/30 | 10.65.80.193 – 10.65.80.194 | 10.65.80.195 |
| 50 | 10.65.80.196/30 | 10.65.80.197 – 10.65.80.198 | 10.65.80.199 |
| 51 | 10.65.80.200/30 | 10.65.80.201 – 10.65.80.202 | 10.65.80.203 |
| 52 | 10.65.80.204/30 | 10.65.80.205 – 10.65.80.206 | 10.65.80.207 |
| 53 | 10.65.80.208/30 | 10.65.80.209 – 10.65.80.210 | 10.65.80.211 |
| 54 | 10.65.80.212/30 | 10.65.80.213 – 10.65.80.214 | 10.65.80.215 |
| 55 | 10.65.80.216/30 | 10.65.80.217 – 10.65.80.218 | 10.65.80.219 |
| 56 | 10.65.80.220/30 | 10.65.80.221 – 10.65.80.222 | 10.65.80.223 |
| 57 | 10.65.80.224/30 | 10.65.80.225 – 10.65.80.226 | 10.65.80.227 |
| 58 | 10.65.80.228/30 | 10.65.80.229 – 10.65.80.230 | 10.65.80.231 |
| 59 | 10.65.80.232/30 | 10.65.80.233 – 10.65.80.234 | 10.65.80.235 |
| 60 | 10.65.80.236/30 | 10.65.80.237 – 10.65.80.238 | 10.65.80.239 |
| 61 | 10.65.80.240/30 | 10.65.80.241 – 10.65.80.242 | 10.65.80.243 |
| 62 | 10.65.80.244/30 | 10.65.80.245 – 10.65.80.246 | 10.65.80.247 |
| 63 | 10.65.80.248/30 | 10.65.80.249 – 10.65.80.250 | 10.65.80.251 |
| 64 | 10.65.80.252/30 | 10.65.80.253 – 10.65.80.254 | 10.65.80.255 |
| 65 | 10.65.81.0/30 | 10.65.81.1 – 10.65.81.2 | 10.65.81.3 |
| 66 | 10.65.81.4/30 | 10.65.81.5 – 10.65.81.6 | 10.65.81.7 |
| 67 | 10.65.81.8/30 | 10.65.81.9 – 10.65.81.10 | 10.65.81.11 |
| 68 | 10.65.81.12/30 | 10.65.81.13 – 10.65.81.14 | 10.65.81.15 |
| 69 | 10.65.81.16/30 | 10.65.81.17 – 10.65.81.18 | 10.65.81.19 |
| 70 | 10.65.81.20/30 | 10.65.81.21 – 10.65.81.22 | 10.65.81.23 |
| 71 | 10.65.81.24/30 | 10.65.81.25 – 10.65.81.26 | 10.65.81.27 |
| 72 | 10.65.81.28/30 | 10.65.81.29 – 10.65.81.30 | 10.65.81.31 |
| 73 | 10.65.81.32/30 | 10.65.81.33 – 10.65.81.34 | 10.65.81.35 |
| 74 | 10.65.81.36/30 | 10.65.81.37 – 10.65.81.38 | 10.65.81.39 |
| 75 | 10.65.81.40/30 | 10.65.81.41 – 10.65.81.42 | 10.65.81.43 |
| 76 | 10.65.81.44/30 | 10.65.81.45 – 10.65.81.46 | 10.65.81.47 |
| 77 | 10.65.81.48/30 | 10.65.81.49 – 10.65.81.50 | 10.65.81.51 |
| 78 | 10.65.81.52/30 | 10.65.81.53 – 10.65.81.54 | 10.65.81.55 |
| 79 | 10.65.81.56/30 | 10.65.81.57 – 10.65.81.58 | 10.65.81.59 |
| 80 | 10.65.81.60/30 | 10.65.81.61 – 10.65.81.62 | 10.65.81.63 |
| 81 | 10.65.81.64/30 | 10.65.81.65 – 10.65.81.66 | 10.65.81.67 |
| 82 | 10.65.81.68/30 | 10.65.81.69 – 10.65.81.70 | 10.65.81.71 |
| 83 | 10.65.81.72/30 | 10.65.81.73 – 10.65.81.74 | 10.65.81.75 |
| 84 | 10.65.81.76/30 | 10.65.81.77 – 10.65.81.78 | 10.65.81.79 |
| 85 | 10.65.81.80/30 | 10.65.81.81 – 10.65.81.82 | 10.65.81.83 |
| 86 | 10.65.81.84/30 | 10.65.81.85 – 10.65.81.86 | 10.65.81.87 |
| 87 | 10.65.81.88/30 | 10.65.81.89 – 10.65.81.90 | 10.65.81.91 |
| 88 | 10.65.81.92/30 | 10.65.81.93 – 10.65.81.94 | 10.65.81.95 |
| 89 | 10.65.81.96/30 | 10.65.81.97 – 10.65.81.98 | 10.65.81.99 |
| 90 | 10.65.81.100/30 | 10.65.81.101 – 10.65.81.102 | 10.65.81.103 |
| 91 | 10.65.81.104/30 | 10.65.81.105 – 10.65.81.106 | 10.65.81.107 |
| 92 | 10.65.81.108/30 | 10.65.81.109 – 10.65.81.110 | 10.65.81.111 |
| 93 | 10.65.81.112/30 | 10.65.81.113 – 10.65.81.114 | 10.65.81.115 |
| 94 | 10.65.81.116/30 | 10.65.81.117 – 10.65.81.118 | 10.65.81.119 |
| 95 | 10.65.81.120/30 | 10.65.81.121 – 10.65.81.122 | 10.65.81.123 |
| 96 | 10.65.81.124/30 | 10.65.81.125 – 10.65.81.126 | 10.65.81.127 |
| 97 | 10.65.81.128/30 | 10.65.81.129 – 10.65.81.130 | 10.65.81.131 |
| 98 | 10.65.81.132/30 | 10.65.81.133 – 10.65.81.134 | 10.65.81.135 |
| 99 | 10.65.81.136/30 | 10.65.81.137 – 10.65.81.138 | 10.65.81.139 |
| 100 | 10.65.81.140/30 | 10.65.81.141 – 10.65.81.142 | 10.65.81.143 |
| 101 | 10.65.81.144/30 | 10.65.81.145 – 10.65.81.146 | 10.65.81.147 |
| 102 | 10.65.81.148/30 | 10.65.81.149 – 10.65.81.150 | 10.65.81.151 |
| 103 | 10.65.81.152/30 | 10.65.81.153 – 10.65.81.154 | 10.65.81.155 |
| 104 | 10.65.81.156/30 | 10.65.81.157 – 10.65.81.158 | 10.65.81.159 |
| 105 | 10.65.81.160/30 | 10.65.81.161 – 10.65.81.162 | 10.65.81.163 |
| 106 | 10.65.81.164/30 | 10.65.81.165 – 10.65.81.166 | 10.65.81.167 |
| 107 | 10.65.81.168/30 | 10.65.81.169 – 10.65.81.170 | 10.65.81.171 |
| 108 | 10.65.81.172/30 | 10.65.81.173 – 10.65.81.174 | 10.65.81.175 |
| 109 | 10.65.81.176/30 | 10.65.81.177 – 10.65.81.178 | 10.65.81.179 |
| 110 | 10.65.81.180/30 | 10.65.81.181 – 10.65.81.182 | 10.65.81.183 |
| 111 | 10.65.81.184/30 | 10.65.81.185 – 10.65.81.186 | 10.65.81.187 |
| 112 | 10.65.81.188/30 | 10.65.81.189 – 10.65.81.190 | 10.65.81.191 |
| 113 | 10.65.81.192/30 | 10.65.81.193 – 10.65.81.194 | 10.65.81.195 |
| 114 | 10.65.81.196/30 | 10.65.81.197 – 10.65.81.198 | 10.65.81.199 |
| 115 | 10.65.81.200/30 | 10.65.81.201 – 10.65.81.202 | 10.65.81.203 |
| 116 | 10.65.81.204/30 | 10.65.81.205 – 10.65.81.206 | 10.65.81.207 |
| 117 | 10.65.81.208/30 | 10.65.81.209 – 10.65.81.210 | 10.65.81.211 |
| 118 | 10.65.81.212/30 | 10.65.81.213 – 10.65.81.214 | 10.65.81.215 |
| 119 | 10.65.81.216/30 | 10.65.81.217 – 10.65.81.218 | 10.65.81.219 |
| 120 | 10.65.81.220/30 | 10.65.81.221 – 10.65.81.222 | 10.65.81.223 |
| 121 | 10.65.81.224/30 | 10.65.81.225 – 10.65.81.226 | 10.65.81.227 |
| 122 | 10.65.81.228/30 | 10.65.81.229 – 10.65.81.230 | 10.65.81.231 |
| 123 | 10.65.81.232/30 | 10.65.81.233 – 10.65.81.234 | 10.65.81.235 |
| 124 | 10.65.81.236/30 | 10.65.81.237 – 10.65.81.238 | 10.65.81.239 |
| 125 | 10.65.81.240/30 | 10.65.81.241 – 10.65.81.242 | 10.65.81.243 |
| 126 | 10.65.81.244/30 | 10.65.81.245 – 10.65.81.246 | 10.65.81.247 |
| 127 | 10.65.81.248/30 | 10.65.81.249 – 10.65.81.250 | 10.65.81.251 |
| 128 | 10.65.81.252/30 | 10.65.81.253 – 10.65.81.254 | 10.65.81.255 |
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.