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)10.0.120.0/24
network10.0.120.0/24
broadcast10.0.120.255
first host10.0.120.1
last host10.0.120.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.120.0/24
address00001010.00000000.01111000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.01111000.00000000
broadcast00001010.00000000.01111000.11111111
green = network part, grey = host part
hex0x0a007800
decimal167802880
reverse dns0.120.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:7800
/24 split into /30 · 64 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.120.0/30 | 10.0.120.1 – 10.0.120.2 | 10.0.120.3 |
| 2 | 10.0.120.4/30 | 10.0.120.5 – 10.0.120.6 | 10.0.120.7 |
| 3 | 10.0.120.8/30 | 10.0.120.9 – 10.0.120.10 | 10.0.120.11 |
| 4 | 10.0.120.12/30 | 10.0.120.13 – 10.0.120.14 | 10.0.120.15 |
| 5 | 10.0.120.16/30 | 10.0.120.17 – 10.0.120.18 | 10.0.120.19 |
| 6 | 10.0.120.20/30 | 10.0.120.21 – 10.0.120.22 | 10.0.120.23 |
| 7 | 10.0.120.24/30 | 10.0.120.25 – 10.0.120.26 | 10.0.120.27 |
| 8 | 10.0.120.28/30 | 10.0.120.29 – 10.0.120.30 | 10.0.120.31 |
| 9 | 10.0.120.32/30 | 10.0.120.33 – 10.0.120.34 | 10.0.120.35 |
| 10 | 10.0.120.36/30 | 10.0.120.37 – 10.0.120.38 | 10.0.120.39 |
| 11 | 10.0.120.40/30 | 10.0.120.41 – 10.0.120.42 | 10.0.120.43 |
| 12 | 10.0.120.44/30 | 10.0.120.45 – 10.0.120.46 | 10.0.120.47 |
| 13 | 10.0.120.48/30 | 10.0.120.49 – 10.0.120.50 | 10.0.120.51 |
| 14 | 10.0.120.52/30 | 10.0.120.53 – 10.0.120.54 | 10.0.120.55 |
| 15 | 10.0.120.56/30 | 10.0.120.57 – 10.0.120.58 | 10.0.120.59 |
| 16 | 10.0.120.60/30 | 10.0.120.61 – 10.0.120.62 | 10.0.120.63 |
| 17 | 10.0.120.64/30 | 10.0.120.65 – 10.0.120.66 | 10.0.120.67 |
| 18 | 10.0.120.68/30 | 10.0.120.69 – 10.0.120.70 | 10.0.120.71 |
| 19 | 10.0.120.72/30 | 10.0.120.73 – 10.0.120.74 | 10.0.120.75 |
| 20 | 10.0.120.76/30 | 10.0.120.77 – 10.0.120.78 | 10.0.120.79 |
| 21 | 10.0.120.80/30 | 10.0.120.81 – 10.0.120.82 | 10.0.120.83 |
| 22 | 10.0.120.84/30 | 10.0.120.85 – 10.0.120.86 | 10.0.120.87 |
| 23 | 10.0.120.88/30 | 10.0.120.89 – 10.0.120.90 | 10.0.120.91 |
| 24 | 10.0.120.92/30 | 10.0.120.93 – 10.0.120.94 | 10.0.120.95 |
| 25 | 10.0.120.96/30 | 10.0.120.97 – 10.0.120.98 | 10.0.120.99 |
| 26 | 10.0.120.100/30 | 10.0.120.101 – 10.0.120.102 | 10.0.120.103 |
| 27 | 10.0.120.104/30 | 10.0.120.105 – 10.0.120.106 | 10.0.120.107 |
| 28 | 10.0.120.108/30 | 10.0.120.109 – 10.0.120.110 | 10.0.120.111 |
| 29 | 10.0.120.112/30 | 10.0.120.113 – 10.0.120.114 | 10.0.120.115 |
| 30 | 10.0.120.116/30 | 10.0.120.117 – 10.0.120.118 | 10.0.120.119 |
| 31 | 10.0.120.120/30 | 10.0.120.121 – 10.0.120.122 | 10.0.120.123 |
| 32 | 10.0.120.124/30 | 10.0.120.125 – 10.0.120.126 | 10.0.120.127 |
| 33 | 10.0.120.128/30 | 10.0.120.129 – 10.0.120.130 | 10.0.120.131 |
| 34 | 10.0.120.132/30 | 10.0.120.133 – 10.0.120.134 | 10.0.120.135 |
| 35 | 10.0.120.136/30 | 10.0.120.137 – 10.0.120.138 | 10.0.120.139 |
| 36 | 10.0.120.140/30 | 10.0.120.141 – 10.0.120.142 | 10.0.120.143 |
| 37 | 10.0.120.144/30 | 10.0.120.145 – 10.0.120.146 | 10.0.120.147 |
| 38 | 10.0.120.148/30 | 10.0.120.149 – 10.0.120.150 | 10.0.120.151 |
| 39 | 10.0.120.152/30 | 10.0.120.153 – 10.0.120.154 | 10.0.120.155 |
| 40 | 10.0.120.156/30 | 10.0.120.157 – 10.0.120.158 | 10.0.120.159 |
| 41 | 10.0.120.160/30 | 10.0.120.161 – 10.0.120.162 | 10.0.120.163 |
| 42 | 10.0.120.164/30 | 10.0.120.165 – 10.0.120.166 | 10.0.120.167 |
| 43 | 10.0.120.168/30 | 10.0.120.169 – 10.0.120.170 | 10.0.120.171 |
| 44 | 10.0.120.172/30 | 10.0.120.173 – 10.0.120.174 | 10.0.120.175 |
| 45 | 10.0.120.176/30 | 10.0.120.177 – 10.0.120.178 | 10.0.120.179 |
| 46 | 10.0.120.180/30 | 10.0.120.181 – 10.0.120.182 | 10.0.120.183 |
| 47 | 10.0.120.184/30 | 10.0.120.185 – 10.0.120.186 | 10.0.120.187 |
| 48 | 10.0.120.188/30 | 10.0.120.189 – 10.0.120.190 | 10.0.120.191 |
| 49 | 10.0.120.192/30 | 10.0.120.193 – 10.0.120.194 | 10.0.120.195 |
| 50 | 10.0.120.196/30 | 10.0.120.197 – 10.0.120.198 | 10.0.120.199 |
| 51 | 10.0.120.200/30 | 10.0.120.201 – 10.0.120.202 | 10.0.120.203 |
| 52 | 10.0.120.204/30 | 10.0.120.205 – 10.0.120.206 | 10.0.120.207 |
| 53 | 10.0.120.208/30 | 10.0.120.209 – 10.0.120.210 | 10.0.120.211 |
| 54 | 10.0.120.212/30 | 10.0.120.213 – 10.0.120.214 | 10.0.120.215 |
| 55 | 10.0.120.216/30 | 10.0.120.217 – 10.0.120.218 | 10.0.120.219 |
| 56 | 10.0.120.220/30 | 10.0.120.221 – 10.0.120.222 | 10.0.120.223 |
| 57 | 10.0.120.224/30 | 10.0.120.225 – 10.0.120.226 | 10.0.120.227 |
| 58 | 10.0.120.228/30 | 10.0.120.229 – 10.0.120.230 | 10.0.120.231 |
| 59 | 10.0.120.232/30 | 10.0.120.233 – 10.0.120.234 | 10.0.120.235 |
| 60 | 10.0.120.236/30 | 10.0.120.237 – 10.0.120.238 | 10.0.120.239 |
| 61 | 10.0.120.240/30 | 10.0.120.241 – 10.0.120.242 | 10.0.120.243 |
| 62 | 10.0.120.244/30 | 10.0.120.245 – 10.0.120.246 | 10.0.120.247 |
| 63 | 10.0.120.248/30 | 10.0.120.249 – 10.0.120.250 | 10.0.120.251 |
| 64 | 10.0.120.252/30 | 10.0.120.253 – 10.0.120.254 | 10.0.120.255 |
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 /24 |
|---|---|---|---|---|
| /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 | 1 |
| /25 | 255.255.255.128 | 128 | 126 | 2 split → |
| /26 | 255.255.255.192 | 64 | 62 | 4 split → |
| /27 | 255.255.255.224 | 32 | 30 | 8 split → |
| /28 | 255.255.255.240 | 16 | 14 | 16 split → |
| /29 | 255.255.255.248 | 8 | 6 | 32 split → |
| /30 | 255.255.255.252 | 4 | 2 | 64 split → |
| /31 | 255.255.255.254 | 2 | 2 | 128 split → |
| /32 | 255.255.255.255 | 1 | 1 | 256 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.