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)10.167.121.0/24
network10.167.121.0/24
broadcast10.167.121.255
first host10.167.121.1
last host10.167.121.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.167.121.0/24
address00001010.10100111.01111001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100111.01111001.00000000
broadcast00001010.10100111.01111001.11111111
green = network part, grey = host part
hex0x0aa77900
decimal178747648
reverse dns0.121.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:7900
/24 split into /31 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.167.121.0/31 | 10.167.121.0 – 10.167.121.1 | 10.167.121.1 |
| 2 | 10.167.121.2/31 | 10.167.121.2 – 10.167.121.3 | 10.167.121.3 |
| 3 | 10.167.121.4/31 | 10.167.121.4 – 10.167.121.5 | 10.167.121.5 |
| 4 | 10.167.121.6/31 | 10.167.121.6 – 10.167.121.7 | 10.167.121.7 |
| 5 | 10.167.121.8/31 | 10.167.121.8 – 10.167.121.9 | 10.167.121.9 |
| 6 | 10.167.121.10/31 | 10.167.121.10 – 10.167.121.11 | 10.167.121.11 |
| 7 | 10.167.121.12/31 | 10.167.121.12 – 10.167.121.13 | 10.167.121.13 |
| 8 | 10.167.121.14/31 | 10.167.121.14 – 10.167.121.15 | 10.167.121.15 |
| 9 | 10.167.121.16/31 | 10.167.121.16 – 10.167.121.17 | 10.167.121.17 |
| 10 | 10.167.121.18/31 | 10.167.121.18 – 10.167.121.19 | 10.167.121.19 |
| 11 | 10.167.121.20/31 | 10.167.121.20 – 10.167.121.21 | 10.167.121.21 |
| 12 | 10.167.121.22/31 | 10.167.121.22 – 10.167.121.23 | 10.167.121.23 |
| 13 | 10.167.121.24/31 | 10.167.121.24 – 10.167.121.25 | 10.167.121.25 |
| 14 | 10.167.121.26/31 | 10.167.121.26 – 10.167.121.27 | 10.167.121.27 |
| 15 | 10.167.121.28/31 | 10.167.121.28 – 10.167.121.29 | 10.167.121.29 |
| 16 | 10.167.121.30/31 | 10.167.121.30 – 10.167.121.31 | 10.167.121.31 |
| 17 | 10.167.121.32/31 | 10.167.121.32 – 10.167.121.33 | 10.167.121.33 |
| 18 | 10.167.121.34/31 | 10.167.121.34 – 10.167.121.35 | 10.167.121.35 |
| 19 | 10.167.121.36/31 | 10.167.121.36 – 10.167.121.37 | 10.167.121.37 |
| 20 | 10.167.121.38/31 | 10.167.121.38 – 10.167.121.39 | 10.167.121.39 |
| 21 | 10.167.121.40/31 | 10.167.121.40 – 10.167.121.41 | 10.167.121.41 |
| 22 | 10.167.121.42/31 | 10.167.121.42 – 10.167.121.43 | 10.167.121.43 |
| 23 | 10.167.121.44/31 | 10.167.121.44 – 10.167.121.45 | 10.167.121.45 |
| 24 | 10.167.121.46/31 | 10.167.121.46 – 10.167.121.47 | 10.167.121.47 |
| 25 | 10.167.121.48/31 | 10.167.121.48 – 10.167.121.49 | 10.167.121.49 |
| 26 | 10.167.121.50/31 | 10.167.121.50 – 10.167.121.51 | 10.167.121.51 |
| 27 | 10.167.121.52/31 | 10.167.121.52 – 10.167.121.53 | 10.167.121.53 |
| 28 | 10.167.121.54/31 | 10.167.121.54 – 10.167.121.55 | 10.167.121.55 |
| 29 | 10.167.121.56/31 | 10.167.121.56 – 10.167.121.57 | 10.167.121.57 |
| 30 | 10.167.121.58/31 | 10.167.121.58 – 10.167.121.59 | 10.167.121.59 |
| 31 | 10.167.121.60/31 | 10.167.121.60 – 10.167.121.61 | 10.167.121.61 |
| 32 | 10.167.121.62/31 | 10.167.121.62 – 10.167.121.63 | 10.167.121.63 |
| 33 | 10.167.121.64/31 | 10.167.121.64 – 10.167.121.65 | 10.167.121.65 |
| 34 | 10.167.121.66/31 | 10.167.121.66 – 10.167.121.67 | 10.167.121.67 |
| 35 | 10.167.121.68/31 | 10.167.121.68 – 10.167.121.69 | 10.167.121.69 |
| 36 | 10.167.121.70/31 | 10.167.121.70 – 10.167.121.71 | 10.167.121.71 |
| 37 | 10.167.121.72/31 | 10.167.121.72 – 10.167.121.73 | 10.167.121.73 |
| 38 | 10.167.121.74/31 | 10.167.121.74 – 10.167.121.75 | 10.167.121.75 |
| 39 | 10.167.121.76/31 | 10.167.121.76 – 10.167.121.77 | 10.167.121.77 |
| 40 | 10.167.121.78/31 | 10.167.121.78 – 10.167.121.79 | 10.167.121.79 |
| 41 | 10.167.121.80/31 | 10.167.121.80 – 10.167.121.81 | 10.167.121.81 |
| 42 | 10.167.121.82/31 | 10.167.121.82 – 10.167.121.83 | 10.167.121.83 |
| 43 | 10.167.121.84/31 | 10.167.121.84 – 10.167.121.85 | 10.167.121.85 |
| 44 | 10.167.121.86/31 | 10.167.121.86 – 10.167.121.87 | 10.167.121.87 |
| 45 | 10.167.121.88/31 | 10.167.121.88 – 10.167.121.89 | 10.167.121.89 |
| 46 | 10.167.121.90/31 | 10.167.121.90 – 10.167.121.91 | 10.167.121.91 |
| 47 | 10.167.121.92/31 | 10.167.121.92 – 10.167.121.93 | 10.167.121.93 |
| 48 | 10.167.121.94/31 | 10.167.121.94 – 10.167.121.95 | 10.167.121.95 |
| 49 | 10.167.121.96/31 | 10.167.121.96 – 10.167.121.97 | 10.167.121.97 |
| 50 | 10.167.121.98/31 | 10.167.121.98 – 10.167.121.99 | 10.167.121.99 |
| 51 | 10.167.121.100/31 | 10.167.121.100 – 10.167.121.101 | 10.167.121.101 |
| 52 | 10.167.121.102/31 | 10.167.121.102 – 10.167.121.103 | 10.167.121.103 |
| 53 | 10.167.121.104/31 | 10.167.121.104 – 10.167.121.105 | 10.167.121.105 |
| 54 | 10.167.121.106/31 | 10.167.121.106 – 10.167.121.107 | 10.167.121.107 |
| 55 | 10.167.121.108/31 | 10.167.121.108 – 10.167.121.109 | 10.167.121.109 |
| 56 | 10.167.121.110/31 | 10.167.121.110 – 10.167.121.111 | 10.167.121.111 |
| 57 | 10.167.121.112/31 | 10.167.121.112 – 10.167.121.113 | 10.167.121.113 |
| 58 | 10.167.121.114/31 | 10.167.121.114 – 10.167.121.115 | 10.167.121.115 |
| 59 | 10.167.121.116/31 | 10.167.121.116 – 10.167.121.117 | 10.167.121.117 |
| 60 | 10.167.121.118/31 | 10.167.121.118 – 10.167.121.119 | 10.167.121.119 |
| 61 | 10.167.121.120/31 | 10.167.121.120 – 10.167.121.121 | 10.167.121.121 |
| 62 | 10.167.121.122/31 | 10.167.121.122 – 10.167.121.123 | 10.167.121.123 |
| 63 | 10.167.121.124/31 | 10.167.121.124 – 10.167.121.125 | 10.167.121.125 |
| 64 | 10.167.121.126/31 | 10.167.121.126 – 10.167.121.127 | 10.167.121.127 |
| 65 | 10.167.121.128/31 | 10.167.121.128 – 10.167.121.129 | 10.167.121.129 |
| 66 | 10.167.121.130/31 | 10.167.121.130 – 10.167.121.131 | 10.167.121.131 |
| 67 | 10.167.121.132/31 | 10.167.121.132 – 10.167.121.133 | 10.167.121.133 |
| 68 | 10.167.121.134/31 | 10.167.121.134 – 10.167.121.135 | 10.167.121.135 |
| 69 | 10.167.121.136/31 | 10.167.121.136 – 10.167.121.137 | 10.167.121.137 |
| 70 | 10.167.121.138/31 | 10.167.121.138 – 10.167.121.139 | 10.167.121.139 |
| 71 | 10.167.121.140/31 | 10.167.121.140 – 10.167.121.141 | 10.167.121.141 |
| 72 | 10.167.121.142/31 | 10.167.121.142 – 10.167.121.143 | 10.167.121.143 |
| 73 | 10.167.121.144/31 | 10.167.121.144 – 10.167.121.145 | 10.167.121.145 |
| 74 | 10.167.121.146/31 | 10.167.121.146 – 10.167.121.147 | 10.167.121.147 |
| 75 | 10.167.121.148/31 | 10.167.121.148 – 10.167.121.149 | 10.167.121.149 |
| 76 | 10.167.121.150/31 | 10.167.121.150 – 10.167.121.151 | 10.167.121.151 |
| 77 | 10.167.121.152/31 | 10.167.121.152 – 10.167.121.153 | 10.167.121.153 |
| 78 | 10.167.121.154/31 | 10.167.121.154 – 10.167.121.155 | 10.167.121.155 |
| 79 | 10.167.121.156/31 | 10.167.121.156 – 10.167.121.157 | 10.167.121.157 |
| 80 | 10.167.121.158/31 | 10.167.121.158 – 10.167.121.159 | 10.167.121.159 |
| 81 | 10.167.121.160/31 | 10.167.121.160 – 10.167.121.161 | 10.167.121.161 |
| 82 | 10.167.121.162/31 | 10.167.121.162 – 10.167.121.163 | 10.167.121.163 |
| 83 | 10.167.121.164/31 | 10.167.121.164 – 10.167.121.165 | 10.167.121.165 |
| 84 | 10.167.121.166/31 | 10.167.121.166 – 10.167.121.167 | 10.167.121.167 |
| 85 | 10.167.121.168/31 | 10.167.121.168 – 10.167.121.169 | 10.167.121.169 |
| 86 | 10.167.121.170/31 | 10.167.121.170 – 10.167.121.171 | 10.167.121.171 |
| 87 | 10.167.121.172/31 | 10.167.121.172 – 10.167.121.173 | 10.167.121.173 |
| 88 | 10.167.121.174/31 | 10.167.121.174 – 10.167.121.175 | 10.167.121.175 |
| 89 | 10.167.121.176/31 | 10.167.121.176 – 10.167.121.177 | 10.167.121.177 |
| 90 | 10.167.121.178/31 | 10.167.121.178 – 10.167.121.179 | 10.167.121.179 |
| 91 | 10.167.121.180/31 | 10.167.121.180 – 10.167.121.181 | 10.167.121.181 |
| 92 | 10.167.121.182/31 | 10.167.121.182 – 10.167.121.183 | 10.167.121.183 |
| 93 | 10.167.121.184/31 | 10.167.121.184 – 10.167.121.185 | 10.167.121.185 |
| 94 | 10.167.121.186/31 | 10.167.121.186 – 10.167.121.187 | 10.167.121.187 |
| 95 | 10.167.121.188/31 | 10.167.121.188 – 10.167.121.189 | 10.167.121.189 |
| 96 | 10.167.121.190/31 | 10.167.121.190 – 10.167.121.191 | 10.167.121.191 |
| 97 | 10.167.121.192/31 | 10.167.121.192 – 10.167.121.193 | 10.167.121.193 |
| 98 | 10.167.121.194/31 | 10.167.121.194 – 10.167.121.195 | 10.167.121.195 |
| 99 | 10.167.121.196/31 | 10.167.121.196 – 10.167.121.197 | 10.167.121.197 |
| 100 | 10.167.121.198/31 | 10.167.121.198 – 10.167.121.199 | 10.167.121.199 |
| 101 | 10.167.121.200/31 | 10.167.121.200 – 10.167.121.201 | 10.167.121.201 |
| 102 | 10.167.121.202/31 | 10.167.121.202 – 10.167.121.203 | 10.167.121.203 |
| 103 | 10.167.121.204/31 | 10.167.121.204 – 10.167.121.205 | 10.167.121.205 |
| 104 | 10.167.121.206/31 | 10.167.121.206 – 10.167.121.207 | 10.167.121.207 |
| 105 | 10.167.121.208/31 | 10.167.121.208 – 10.167.121.209 | 10.167.121.209 |
| 106 | 10.167.121.210/31 | 10.167.121.210 – 10.167.121.211 | 10.167.121.211 |
| 107 | 10.167.121.212/31 | 10.167.121.212 – 10.167.121.213 | 10.167.121.213 |
| 108 | 10.167.121.214/31 | 10.167.121.214 – 10.167.121.215 | 10.167.121.215 |
| 109 | 10.167.121.216/31 | 10.167.121.216 – 10.167.121.217 | 10.167.121.217 |
| 110 | 10.167.121.218/31 | 10.167.121.218 – 10.167.121.219 | 10.167.121.219 |
| 111 | 10.167.121.220/31 | 10.167.121.220 – 10.167.121.221 | 10.167.121.221 |
| 112 | 10.167.121.222/31 | 10.167.121.222 – 10.167.121.223 | 10.167.121.223 |
| 113 | 10.167.121.224/31 | 10.167.121.224 – 10.167.121.225 | 10.167.121.225 |
| 114 | 10.167.121.226/31 | 10.167.121.226 – 10.167.121.227 | 10.167.121.227 |
| 115 | 10.167.121.228/31 | 10.167.121.228 – 10.167.121.229 | 10.167.121.229 |
| 116 | 10.167.121.230/31 | 10.167.121.230 – 10.167.121.231 | 10.167.121.231 |
| 117 | 10.167.121.232/31 | 10.167.121.232 – 10.167.121.233 | 10.167.121.233 |
| 118 | 10.167.121.234/31 | 10.167.121.234 – 10.167.121.235 | 10.167.121.235 |
| 119 | 10.167.121.236/31 | 10.167.121.236 – 10.167.121.237 | 10.167.121.237 |
| 120 | 10.167.121.238/31 | 10.167.121.238 – 10.167.121.239 | 10.167.121.239 |
| 121 | 10.167.121.240/31 | 10.167.121.240 – 10.167.121.241 | 10.167.121.241 |
| 122 | 10.167.121.242/31 | 10.167.121.242 – 10.167.121.243 | 10.167.121.243 |
| 123 | 10.167.121.244/31 | 10.167.121.244 – 10.167.121.245 | 10.167.121.245 |
| 124 | 10.167.121.246/31 | 10.167.121.246 – 10.167.121.247 | 10.167.121.247 |
| 125 | 10.167.121.248/31 | 10.167.121.248 – 10.167.121.249 | 10.167.121.249 |
| 126 | 10.167.121.250/31 | 10.167.121.250 – 10.167.121.251 | 10.167.121.251 |
| 127 | 10.167.121.252/31 | 10.167.121.252 – 10.167.121.253 | 10.167.121.253 |
| 128 | 10.167.121.254/31 | 10.167.121.254 – 10.167.121.255 | 10.167.121.255 |
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.