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)172.16.4.128/25
network172.16.4.128/25
broadcast172.16.4.255
first host172.16.4.129
last host172.16.4.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classB
ipcalc 172.16.4.128/25
address10101100.00010000.00000100.10000000
subnet mask11111111.11111111.11111111.10000000
network10101100.00010000.00000100.10000000
broadcast10101100.00010000.00000100.11111111
green = network part, grey = host part
hex0xac100480
decimal2886730880
reverse dns128.4.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:480
/25 split into /32 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.4.128/32 | 172.16.4.128 – 172.16.4.128 | 172.16.4.128 |
| 2 | 172.16.4.129/32 | 172.16.4.129 – 172.16.4.129 | 172.16.4.129 |
| 3 | 172.16.4.130/32 | 172.16.4.130 – 172.16.4.130 | 172.16.4.130 |
| 4 | 172.16.4.131/32 | 172.16.4.131 – 172.16.4.131 | 172.16.4.131 |
| 5 | 172.16.4.132/32 | 172.16.4.132 – 172.16.4.132 | 172.16.4.132 |
| 6 | 172.16.4.133/32 | 172.16.4.133 – 172.16.4.133 | 172.16.4.133 |
| 7 | 172.16.4.134/32 | 172.16.4.134 – 172.16.4.134 | 172.16.4.134 |
| 8 | 172.16.4.135/32 | 172.16.4.135 – 172.16.4.135 | 172.16.4.135 |
| 9 | 172.16.4.136/32 | 172.16.4.136 – 172.16.4.136 | 172.16.4.136 |
| 10 | 172.16.4.137/32 | 172.16.4.137 – 172.16.4.137 | 172.16.4.137 |
| 11 | 172.16.4.138/32 | 172.16.4.138 – 172.16.4.138 | 172.16.4.138 |
| 12 | 172.16.4.139/32 | 172.16.4.139 – 172.16.4.139 | 172.16.4.139 |
| 13 | 172.16.4.140/32 | 172.16.4.140 – 172.16.4.140 | 172.16.4.140 |
| 14 | 172.16.4.141/32 | 172.16.4.141 – 172.16.4.141 | 172.16.4.141 |
| 15 | 172.16.4.142/32 | 172.16.4.142 – 172.16.4.142 | 172.16.4.142 |
| 16 | 172.16.4.143/32 | 172.16.4.143 – 172.16.4.143 | 172.16.4.143 |
| 17 | 172.16.4.144/32 | 172.16.4.144 – 172.16.4.144 | 172.16.4.144 |
| 18 | 172.16.4.145/32 | 172.16.4.145 – 172.16.4.145 | 172.16.4.145 |
| 19 | 172.16.4.146/32 | 172.16.4.146 – 172.16.4.146 | 172.16.4.146 |
| 20 | 172.16.4.147/32 | 172.16.4.147 – 172.16.4.147 | 172.16.4.147 |
| 21 | 172.16.4.148/32 | 172.16.4.148 – 172.16.4.148 | 172.16.4.148 |
| 22 | 172.16.4.149/32 | 172.16.4.149 – 172.16.4.149 | 172.16.4.149 |
| 23 | 172.16.4.150/32 | 172.16.4.150 – 172.16.4.150 | 172.16.4.150 |
| 24 | 172.16.4.151/32 | 172.16.4.151 – 172.16.4.151 | 172.16.4.151 |
| 25 | 172.16.4.152/32 | 172.16.4.152 – 172.16.4.152 | 172.16.4.152 |
| 26 | 172.16.4.153/32 | 172.16.4.153 – 172.16.4.153 | 172.16.4.153 |
| 27 | 172.16.4.154/32 | 172.16.4.154 – 172.16.4.154 | 172.16.4.154 |
| 28 | 172.16.4.155/32 | 172.16.4.155 – 172.16.4.155 | 172.16.4.155 |
| 29 | 172.16.4.156/32 | 172.16.4.156 – 172.16.4.156 | 172.16.4.156 |
| 30 | 172.16.4.157/32 | 172.16.4.157 – 172.16.4.157 | 172.16.4.157 |
| 31 | 172.16.4.158/32 | 172.16.4.158 – 172.16.4.158 | 172.16.4.158 |
| 32 | 172.16.4.159/32 | 172.16.4.159 – 172.16.4.159 | 172.16.4.159 |
| 33 | 172.16.4.160/32 | 172.16.4.160 – 172.16.4.160 | 172.16.4.160 |
| 34 | 172.16.4.161/32 | 172.16.4.161 – 172.16.4.161 | 172.16.4.161 |
| 35 | 172.16.4.162/32 | 172.16.4.162 – 172.16.4.162 | 172.16.4.162 |
| 36 | 172.16.4.163/32 | 172.16.4.163 – 172.16.4.163 | 172.16.4.163 |
| 37 | 172.16.4.164/32 | 172.16.4.164 – 172.16.4.164 | 172.16.4.164 |
| 38 | 172.16.4.165/32 | 172.16.4.165 – 172.16.4.165 | 172.16.4.165 |
| 39 | 172.16.4.166/32 | 172.16.4.166 – 172.16.4.166 | 172.16.4.166 |
| 40 | 172.16.4.167/32 | 172.16.4.167 – 172.16.4.167 | 172.16.4.167 |
| 41 | 172.16.4.168/32 | 172.16.4.168 – 172.16.4.168 | 172.16.4.168 |
| 42 | 172.16.4.169/32 | 172.16.4.169 – 172.16.4.169 | 172.16.4.169 |
| 43 | 172.16.4.170/32 | 172.16.4.170 – 172.16.4.170 | 172.16.4.170 |
| 44 | 172.16.4.171/32 | 172.16.4.171 – 172.16.4.171 | 172.16.4.171 |
| 45 | 172.16.4.172/32 | 172.16.4.172 – 172.16.4.172 | 172.16.4.172 |
| 46 | 172.16.4.173/32 | 172.16.4.173 – 172.16.4.173 | 172.16.4.173 |
| 47 | 172.16.4.174/32 | 172.16.4.174 – 172.16.4.174 | 172.16.4.174 |
| 48 | 172.16.4.175/32 | 172.16.4.175 – 172.16.4.175 | 172.16.4.175 |
| 49 | 172.16.4.176/32 | 172.16.4.176 – 172.16.4.176 | 172.16.4.176 |
| 50 | 172.16.4.177/32 | 172.16.4.177 – 172.16.4.177 | 172.16.4.177 |
| 51 | 172.16.4.178/32 | 172.16.4.178 – 172.16.4.178 | 172.16.4.178 |
| 52 | 172.16.4.179/32 | 172.16.4.179 – 172.16.4.179 | 172.16.4.179 |
| 53 | 172.16.4.180/32 | 172.16.4.180 – 172.16.4.180 | 172.16.4.180 |
| 54 | 172.16.4.181/32 | 172.16.4.181 – 172.16.4.181 | 172.16.4.181 |
| 55 | 172.16.4.182/32 | 172.16.4.182 – 172.16.4.182 | 172.16.4.182 |
| 56 | 172.16.4.183/32 | 172.16.4.183 – 172.16.4.183 | 172.16.4.183 |
| 57 | 172.16.4.184/32 | 172.16.4.184 – 172.16.4.184 | 172.16.4.184 |
| 58 | 172.16.4.185/32 | 172.16.4.185 – 172.16.4.185 | 172.16.4.185 |
| 59 | 172.16.4.186/32 | 172.16.4.186 – 172.16.4.186 | 172.16.4.186 |
| 60 | 172.16.4.187/32 | 172.16.4.187 – 172.16.4.187 | 172.16.4.187 |
| 61 | 172.16.4.188/32 | 172.16.4.188 – 172.16.4.188 | 172.16.4.188 |
| 62 | 172.16.4.189/32 | 172.16.4.189 – 172.16.4.189 | 172.16.4.189 |
| 63 | 172.16.4.190/32 | 172.16.4.190 – 172.16.4.190 | 172.16.4.190 |
| 64 | 172.16.4.191/32 | 172.16.4.191 – 172.16.4.191 | 172.16.4.191 |
| 65 | 172.16.4.192/32 | 172.16.4.192 – 172.16.4.192 | 172.16.4.192 |
| 66 | 172.16.4.193/32 | 172.16.4.193 – 172.16.4.193 | 172.16.4.193 |
| 67 | 172.16.4.194/32 | 172.16.4.194 – 172.16.4.194 | 172.16.4.194 |
| 68 | 172.16.4.195/32 | 172.16.4.195 – 172.16.4.195 | 172.16.4.195 |
| 69 | 172.16.4.196/32 | 172.16.4.196 – 172.16.4.196 | 172.16.4.196 |
| 70 | 172.16.4.197/32 | 172.16.4.197 – 172.16.4.197 | 172.16.4.197 |
| 71 | 172.16.4.198/32 | 172.16.4.198 – 172.16.4.198 | 172.16.4.198 |
| 72 | 172.16.4.199/32 | 172.16.4.199 – 172.16.4.199 | 172.16.4.199 |
| 73 | 172.16.4.200/32 | 172.16.4.200 – 172.16.4.200 | 172.16.4.200 |
| 74 | 172.16.4.201/32 | 172.16.4.201 – 172.16.4.201 | 172.16.4.201 |
| 75 | 172.16.4.202/32 | 172.16.4.202 – 172.16.4.202 | 172.16.4.202 |
| 76 | 172.16.4.203/32 | 172.16.4.203 – 172.16.4.203 | 172.16.4.203 |
| 77 | 172.16.4.204/32 | 172.16.4.204 – 172.16.4.204 | 172.16.4.204 |
| 78 | 172.16.4.205/32 | 172.16.4.205 – 172.16.4.205 | 172.16.4.205 |
| 79 | 172.16.4.206/32 | 172.16.4.206 – 172.16.4.206 | 172.16.4.206 |
| 80 | 172.16.4.207/32 | 172.16.4.207 – 172.16.4.207 | 172.16.4.207 |
| 81 | 172.16.4.208/32 | 172.16.4.208 – 172.16.4.208 | 172.16.4.208 |
| 82 | 172.16.4.209/32 | 172.16.4.209 – 172.16.4.209 | 172.16.4.209 |
| 83 | 172.16.4.210/32 | 172.16.4.210 – 172.16.4.210 | 172.16.4.210 |
| 84 | 172.16.4.211/32 | 172.16.4.211 – 172.16.4.211 | 172.16.4.211 |
| 85 | 172.16.4.212/32 | 172.16.4.212 – 172.16.4.212 | 172.16.4.212 |
| 86 | 172.16.4.213/32 | 172.16.4.213 – 172.16.4.213 | 172.16.4.213 |
| 87 | 172.16.4.214/32 | 172.16.4.214 – 172.16.4.214 | 172.16.4.214 |
| 88 | 172.16.4.215/32 | 172.16.4.215 – 172.16.4.215 | 172.16.4.215 |
| 89 | 172.16.4.216/32 | 172.16.4.216 – 172.16.4.216 | 172.16.4.216 |
| 90 | 172.16.4.217/32 | 172.16.4.217 – 172.16.4.217 | 172.16.4.217 |
| 91 | 172.16.4.218/32 | 172.16.4.218 – 172.16.4.218 | 172.16.4.218 |
| 92 | 172.16.4.219/32 | 172.16.4.219 – 172.16.4.219 | 172.16.4.219 |
| 93 | 172.16.4.220/32 | 172.16.4.220 – 172.16.4.220 | 172.16.4.220 |
| 94 | 172.16.4.221/32 | 172.16.4.221 – 172.16.4.221 | 172.16.4.221 |
| 95 | 172.16.4.222/32 | 172.16.4.222 – 172.16.4.222 | 172.16.4.222 |
| 96 | 172.16.4.223/32 | 172.16.4.223 – 172.16.4.223 | 172.16.4.223 |
| 97 | 172.16.4.224/32 | 172.16.4.224 – 172.16.4.224 | 172.16.4.224 |
| 98 | 172.16.4.225/32 | 172.16.4.225 – 172.16.4.225 | 172.16.4.225 |
| 99 | 172.16.4.226/32 | 172.16.4.226 – 172.16.4.226 | 172.16.4.226 |
| 100 | 172.16.4.227/32 | 172.16.4.227 – 172.16.4.227 | 172.16.4.227 |
| 101 | 172.16.4.228/32 | 172.16.4.228 – 172.16.4.228 | 172.16.4.228 |
| 102 | 172.16.4.229/32 | 172.16.4.229 – 172.16.4.229 | 172.16.4.229 |
| 103 | 172.16.4.230/32 | 172.16.4.230 – 172.16.4.230 | 172.16.4.230 |
| 104 | 172.16.4.231/32 | 172.16.4.231 – 172.16.4.231 | 172.16.4.231 |
| 105 | 172.16.4.232/32 | 172.16.4.232 – 172.16.4.232 | 172.16.4.232 |
| 106 | 172.16.4.233/32 | 172.16.4.233 – 172.16.4.233 | 172.16.4.233 |
| 107 | 172.16.4.234/32 | 172.16.4.234 – 172.16.4.234 | 172.16.4.234 |
| 108 | 172.16.4.235/32 | 172.16.4.235 – 172.16.4.235 | 172.16.4.235 |
| 109 | 172.16.4.236/32 | 172.16.4.236 – 172.16.4.236 | 172.16.4.236 |
| 110 | 172.16.4.237/32 | 172.16.4.237 – 172.16.4.237 | 172.16.4.237 |
| 111 | 172.16.4.238/32 | 172.16.4.238 – 172.16.4.238 | 172.16.4.238 |
| 112 | 172.16.4.239/32 | 172.16.4.239 – 172.16.4.239 | 172.16.4.239 |
| 113 | 172.16.4.240/32 | 172.16.4.240 – 172.16.4.240 | 172.16.4.240 |
| 114 | 172.16.4.241/32 | 172.16.4.241 – 172.16.4.241 | 172.16.4.241 |
| 115 | 172.16.4.242/32 | 172.16.4.242 – 172.16.4.242 | 172.16.4.242 |
| 116 | 172.16.4.243/32 | 172.16.4.243 – 172.16.4.243 | 172.16.4.243 |
| 117 | 172.16.4.244/32 | 172.16.4.244 – 172.16.4.244 | 172.16.4.244 |
| 118 | 172.16.4.245/32 | 172.16.4.245 – 172.16.4.245 | 172.16.4.245 |
| 119 | 172.16.4.246/32 | 172.16.4.246 – 172.16.4.246 | 172.16.4.246 |
| 120 | 172.16.4.247/32 | 172.16.4.247 – 172.16.4.247 | 172.16.4.247 |
| 121 | 172.16.4.248/32 | 172.16.4.248 – 172.16.4.248 | 172.16.4.248 |
| 122 | 172.16.4.249/32 | 172.16.4.249 – 172.16.4.249 | 172.16.4.249 |
| 123 | 172.16.4.250/32 | 172.16.4.250 – 172.16.4.250 | 172.16.4.250 |
| 124 | 172.16.4.251/32 | 172.16.4.251 – 172.16.4.251 | 172.16.4.251 |
| 125 | 172.16.4.252/32 | 172.16.4.252 – 172.16.4.252 | 172.16.4.252 |
| 126 | 172.16.4.253/32 | 172.16.4.253 – 172.16.4.253 | 172.16.4.253 |
| 127 | 172.16.4.254/32 | 172.16.4.254 – 172.16.4.254 | 172.16.4.254 |
| 128 | 172.16.4.255/32 | 172.16.4.255 – 172.16.4.255 | 172.16.4.255 |
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.