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)10.0.115.128/25
network10.0.115.128/25
broadcast10.0.115.255
first host10.0.115.129
last host10.0.115.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.115.128/25
address00001010.00000000.01110011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01110011.10000000
broadcast00001010.00000000.01110011.11111111
green = network part, grey = host part
hex0x0a007380
decimal167801728
reverse dns128.115.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:7380
/25 split into /31 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.115.128/31 | 10.0.115.128 – 10.0.115.129 | 10.0.115.129 |
| 2 | 10.0.115.130/31 | 10.0.115.130 – 10.0.115.131 | 10.0.115.131 |
| 3 | 10.0.115.132/31 | 10.0.115.132 – 10.0.115.133 | 10.0.115.133 |
| 4 | 10.0.115.134/31 | 10.0.115.134 – 10.0.115.135 | 10.0.115.135 |
| 5 | 10.0.115.136/31 | 10.0.115.136 – 10.0.115.137 | 10.0.115.137 |
| 6 | 10.0.115.138/31 | 10.0.115.138 – 10.0.115.139 | 10.0.115.139 |
| 7 | 10.0.115.140/31 | 10.0.115.140 – 10.0.115.141 | 10.0.115.141 |
| 8 | 10.0.115.142/31 | 10.0.115.142 – 10.0.115.143 | 10.0.115.143 |
| 9 | 10.0.115.144/31 | 10.0.115.144 – 10.0.115.145 | 10.0.115.145 |
| 10 | 10.0.115.146/31 | 10.0.115.146 – 10.0.115.147 | 10.0.115.147 |
| 11 | 10.0.115.148/31 | 10.0.115.148 – 10.0.115.149 | 10.0.115.149 |
| 12 | 10.0.115.150/31 | 10.0.115.150 – 10.0.115.151 | 10.0.115.151 |
| 13 | 10.0.115.152/31 | 10.0.115.152 – 10.0.115.153 | 10.0.115.153 |
| 14 | 10.0.115.154/31 | 10.0.115.154 – 10.0.115.155 | 10.0.115.155 |
| 15 | 10.0.115.156/31 | 10.0.115.156 – 10.0.115.157 | 10.0.115.157 |
| 16 | 10.0.115.158/31 | 10.0.115.158 – 10.0.115.159 | 10.0.115.159 |
| 17 | 10.0.115.160/31 | 10.0.115.160 – 10.0.115.161 | 10.0.115.161 |
| 18 | 10.0.115.162/31 | 10.0.115.162 – 10.0.115.163 | 10.0.115.163 |
| 19 | 10.0.115.164/31 | 10.0.115.164 – 10.0.115.165 | 10.0.115.165 |
| 20 | 10.0.115.166/31 | 10.0.115.166 – 10.0.115.167 | 10.0.115.167 |
| 21 | 10.0.115.168/31 | 10.0.115.168 – 10.0.115.169 | 10.0.115.169 |
| 22 | 10.0.115.170/31 | 10.0.115.170 – 10.0.115.171 | 10.0.115.171 |
| 23 | 10.0.115.172/31 | 10.0.115.172 – 10.0.115.173 | 10.0.115.173 |
| 24 | 10.0.115.174/31 | 10.0.115.174 – 10.0.115.175 | 10.0.115.175 |
| 25 | 10.0.115.176/31 | 10.0.115.176 – 10.0.115.177 | 10.0.115.177 |
| 26 | 10.0.115.178/31 | 10.0.115.178 – 10.0.115.179 | 10.0.115.179 |
| 27 | 10.0.115.180/31 | 10.0.115.180 – 10.0.115.181 | 10.0.115.181 |
| 28 | 10.0.115.182/31 | 10.0.115.182 – 10.0.115.183 | 10.0.115.183 |
| 29 | 10.0.115.184/31 | 10.0.115.184 – 10.0.115.185 | 10.0.115.185 |
| 30 | 10.0.115.186/31 | 10.0.115.186 – 10.0.115.187 | 10.0.115.187 |
| 31 | 10.0.115.188/31 | 10.0.115.188 – 10.0.115.189 | 10.0.115.189 |
| 32 | 10.0.115.190/31 | 10.0.115.190 – 10.0.115.191 | 10.0.115.191 |
| 33 | 10.0.115.192/31 | 10.0.115.192 – 10.0.115.193 | 10.0.115.193 |
| 34 | 10.0.115.194/31 | 10.0.115.194 – 10.0.115.195 | 10.0.115.195 |
| 35 | 10.0.115.196/31 | 10.0.115.196 – 10.0.115.197 | 10.0.115.197 |
| 36 | 10.0.115.198/31 | 10.0.115.198 – 10.0.115.199 | 10.0.115.199 |
| 37 | 10.0.115.200/31 | 10.0.115.200 – 10.0.115.201 | 10.0.115.201 |
| 38 | 10.0.115.202/31 | 10.0.115.202 – 10.0.115.203 | 10.0.115.203 |
| 39 | 10.0.115.204/31 | 10.0.115.204 – 10.0.115.205 | 10.0.115.205 |
| 40 | 10.0.115.206/31 | 10.0.115.206 – 10.0.115.207 | 10.0.115.207 |
| 41 | 10.0.115.208/31 | 10.0.115.208 – 10.0.115.209 | 10.0.115.209 |
| 42 | 10.0.115.210/31 | 10.0.115.210 – 10.0.115.211 | 10.0.115.211 |
| 43 | 10.0.115.212/31 | 10.0.115.212 – 10.0.115.213 | 10.0.115.213 |
| 44 | 10.0.115.214/31 | 10.0.115.214 – 10.0.115.215 | 10.0.115.215 |
| 45 | 10.0.115.216/31 | 10.0.115.216 – 10.0.115.217 | 10.0.115.217 |
| 46 | 10.0.115.218/31 | 10.0.115.218 – 10.0.115.219 | 10.0.115.219 |
| 47 | 10.0.115.220/31 | 10.0.115.220 – 10.0.115.221 | 10.0.115.221 |
| 48 | 10.0.115.222/31 | 10.0.115.222 – 10.0.115.223 | 10.0.115.223 |
| 49 | 10.0.115.224/31 | 10.0.115.224 – 10.0.115.225 | 10.0.115.225 |
| 50 | 10.0.115.226/31 | 10.0.115.226 – 10.0.115.227 | 10.0.115.227 |
| 51 | 10.0.115.228/31 | 10.0.115.228 – 10.0.115.229 | 10.0.115.229 |
| 52 | 10.0.115.230/31 | 10.0.115.230 – 10.0.115.231 | 10.0.115.231 |
| 53 | 10.0.115.232/31 | 10.0.115.232 – 10.0.115.233 | 10.0.115.233 |
| 54 | 10.0.115.234/31 | 10.0.115.234 – 10.0.115.235 | 10.0.115.235 |
| 55 | 10.0.115.236/31 | 10.0.115.236 – 10.0.115.237 | 10.0.115.237 |
| 56 | 10.0.115.238/31 | 10.0.115.238 – 10.0.115.239 | 10.0.115.239 |
| 57 | 10.0.115.240/31 | 10.0.115.240 – 10.0.115.241 | 10.0.115.241 |
| 58 | 10.0.115.242/31 | 10.0.115.242 – 10.0.115.243 | 10.0.115.243 |
| 59 | 10.0.115.244/31 | 10.0.115.244 – 10.0.115.245 | 10.0.115.245 |
| 60 | 10.0.115.246/31 | 10.0.115.246 – 10.0.115.247 | 10.0.115.247 |
| 61 | 10.0.115.248/31 | 10.0.115.248 – 10.0.115.249 | 10.0.115.249 |
| 62 | 10.0.115.250/31 | 10.0.115.250 – 10.0.115.251 | 10.0.115.251 |
| 63 | 10.0.115.252/31 | 10.0.115.252 – 10.0.115.253 | 10.0.115.253 |
| 64 | 10.0.115.254/31 | 10.0.115.254 – 10.0.115.255 | 10.0.115.255 |
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 /25 |
|---|---|---|---|---|
| /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 | - |
| /25 | 255.255.255.128 | 128 | 126 | 1 |
| /26 | 255.255.255.192 | 64 | 62 | 2 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32 split → |
| /31 | 255.255.255.254 | 2 | 2 | 64 split → |
| /32 | 255.255.255.255 | 1 | 1 | 128 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.