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)172.16.4.128/26
network172.16.4.128/26
broadcast172.16.4.191
first host172.16.4.129
last host172.16.4.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.4.128/26
address10101100.00010000.00000100.10000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000100.10000000
broadcast10101100.00010000.00000100.10111111
green = network part, grey = host part
hex0xac100480
decimal2886730880
reverse dns128.4.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:480
/26 split into /31 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.4.128/31 | 172.16.4.128 – 172.16.4.129 | 172.16.4.129 |
| 2 | 172.16.4.130/31 | 172.16.4.130 – 172.16.4.131 | 172.16.4.131 |
| 3 | 172.16.4.132/31 | 172.16.4.132 – 172.16.4.133 | 172.16.4.133 |
| 4 | 172.16.4.134/31 | 172.16.4.134 – 172.16.4.135 | 172.16.4.135 |
| 5 | 172.16.4.136/31 | 172.16.4.136 – 172.16.4.137 | 172.16.4.137 |
| 6 | 172.16.4.138/31 | 172.16.4.138 – 172.16.4.139 | 172.16.4.139 |
| 7 | 172.16.4.140/31 | 172.16.4.140 – 172.16.4.141 | 172.16.4.141 |
| 8 | 172.16.4.142/31 | 172.16.4.142 – 172.16.4.143 | 172.16.4.143 |
| 9 | 172.16.4.144/31 | 172.16.4.144 – 172.16.4.145 | 172.16.4.145 |
| 10 | 172.16.4.146/31 | 172.16.4.146 – 172.16.4.147 | 172.16.4.147 |
| 11 | 172.16.4.148/31 | 172.16.4.148 – 172.16.4.149 | 172.16.4.149 |
| 12 | 172.16.4.150/31 | 172.16.4.150 – 172.16.4.151 | 172.16.4.151 |
| 13 | 172.16.4.152/31 | 172.16.4.152 – 172.16.4.153 | 172.16.4.153 |
| 14 | 172.16.4.154/31 | 172.16.4.154 – 172.16.4.155 | 172.16.4.155 |
| 15 | 172.16.4.156/31 | 172.16.4.156 – 172.16.4.157 | 172.16.4.157 |
| 16 | 172.16.4.158/31 | 172.16.4.158 – 172.16.4.159 | 172.16.4.159 |
| 17 | 172.16.4.160/31 | 172.16.4.160 – 172.16.4.161 | 172.16.4.161 |
| 18 | 172.16.4.162/31 | 172.16.4.162 – 172.16.4.163 | 172.16.4.163 |
| 19 | 172.16.4.164/31 | 172.16.4.164 – 172.16.4.165 | 172.16.4.165 |
| 20 | 172.16.4.166/31 | 172.16.4.166 – 172.16.4.167 | 172.16.4.167 |
| 21 | 172.16.4.168/31 | 172.16.4.168 – 172.16.4.169 | 172.16.4.169 |
| 22 | 172.16.4.170/31 | 172.16.4.170 – 172.16.4.171 | 172.16.4.171 |
| 23 | 172.16.4.172/31 | 172.16.4.172 – 172.16.4.173 | 172.16.4.173 |
| 24 | 172.16.4.174/31 | 172.16.4.174 – 172.16.4.175 | 172.16.4.175 |
| 25 | 172.16.4.176/31 | 172.16.4.176 – 172.16.4.177 | 172.16.4.177 |
| 26 | 172.16.4.178/31 | 172.16.4.178 – 172.16.4.179 | 172.16.4.179 |
| 27 | 172.16.4.180/31 | 172.16.4.180 – 172.16.4.181 | 172.16.4.181 |
| 28 | 172.16.4.182/31 | 172.16.4.182 – 172.16.4.183 | 172.16.4.183 |
| 29 | 172.16.4.184/31 | 172.16.4.184 – 172.16.4.185 | 172.16.4.185 |
| 30 | 172.16.4.186/31 | 172.16.4.186 – 172.16.4.187 | 172.16.4.187 |
| 31 | 172.16.4.188/31 | 172.16.4.188 – 172.16.4.189 | 172.16.4.189 |
| 32 | 172.16.4.190/31 | 172.16.4.190 – 172.16.4.191 | 172.16.4.191 |
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 /26 |
|---|---|---|---|---|
| /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 | - |
| /26 | 255.255.255.192 | 64 | 62 | 1 |
| /27 | 255.255.255.224 | 32 | 30 | 2 split → |
| /28 | 255.255.255.240 | 16 | 14 | 4 split → |
| /29 | 255.255.255.248 | 8 | 6 | 8 split → |
| /30 | 255.255.255.252 | 4 | 2 | 16 split → |
| /31 | 255.255.255.254 | 2 | 2 | 32 split → |
| /32 | 255.255.255.255 | 1 | 1 | 64 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.