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)172.16.2.64/26
network172.16.2.64/26
broadcast172.16.2.127
first host172.16.2.65
last host172.16.2.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.2.64/26
address10101100.00010000.00000010.01000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000010.01000000
broadcast10101100.00010000.00000010.01111111
green = network part, grey = host part
hex0xac100240
decimal2886730304
reverse dns64.2.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:240
/26 split into /31 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.2.64/31 | 172.16.2.64 – 172.16.2.65 | 172.16.2.65 |
| 2 | 172.16.2.66/31 | 172.16.2.66 – 172.16.2.67 | 172.16.2.67 |
| 3 | 172.16.2.68/31 | 172.16.2.68 – 172.16.2.69 | 172.16.2.69 |
| 4 | 172.16.2.70/31 | 172.16.2.70 – 172.16.2.71 | 172.16.2.71 |
| 5 | 172.16.2.72/31 | 172.16.2.72 – 172.16.2.73 | 172.16.2.73 |
| 6 | 172.16.2.74/31 | 172.16.2.74 – 172.16.2.75 | 172.16.2.75 |
| 7 | 172.16.2.76/31 | 172.16.2.76 – 172.16.2.77 | 172.16.2.77 |
| 8 | 172.16.2.78/31 | 172.16.2.78 – 172.16.2.79 | 172.16.2.79 |
| 9 | 172.16.2.80/31 | 172.16.2.80 – 172.16.2.81 | 172.16.2.81 |
| 10 | 172.16.2.82/31 | 172.16.2.82 – 172.16.2.83 | 172.16.2.83 |
| 11 | 172.16.2.84/31 | 172.16.2.84 – 172.16.2.85 | 172.16.2.85 |
| 12 | 172.16.2.86/31 | 172.16.2.86 – 172.16.2.87 | 172.16.2.87 |
| 13 | 172.16.2.88/31 | 172.16.2.88 – 172.16.2.89 | 172.16.2.89 |
| 14 | 172.16.2.90/31 | 172.16.2.90 – 172.16.2.91 | 172.16.2.91 |
| 15 | 172.16.2.92/31 | 172.16.2.92 – 172.16.2.93 | 172.16.2.93 |
| 16 | 172.16.2.94/31 | 172.16.2.94 – 172.16.2.95 | 172.16.2.95 |
| 17 | 172.16.2.96/31 | 172.16.2.96 – 172.16.2.97 | 172.16.2.97 |
| 18 | 172.16.2.98/31 | 172.16.2.98 – 172.16.2.99 | 172.16.2.99 |
| 19 | 172.16.2.100/31 | 172.16.2.100 – 172.16.2.101 | 172.16.2.101 |
| 20 | 172.16.2.102/31 | 172.16.2.102 – 172.16.2.103 | 172.16.2.103 |
| 21 | 172.16.2.104/31 | 172.16.2.104 – 172.16.2.105 | 172.16.2.105 |
| 22 | 172.16.2.106/31 | 172.16.2.106 – 172.16.2.107 | 172.16.2.107 |
| 23 | 172.16.2.108/31 | 172.16.2.108 – 172.16.2.109 | 172.16.2.109 |
| 24 | 172.16.2.110/31 | 172.16.2.110 – 172.16.2.111 | 172.16.2.111 |
| 25 | 172.16.2.112/31 | 172.16.2.112 – 172.16.2.113 | 172.16.2.113 |
| 26 | 172.16.2.114/31 | 172.16.2.114 – 172.16.2.115 | 172.16.2.115 |
| 27 | 172.16.2.116/31 | 172.16.2.116 – 172.16.2.117 | 172.16.2.117 |
| 28 | 172.16.2.118/31 | 172.16.2.118 – 172.16.2.119 | 172.16.2.119 |
| 29 | 172.16.2.120/31 | 172.16.2.120 – 172.16.2.121 | 172.16.2.121 |
| 30 | 172.16.2.122/31 | 172.16.2.122 – 172.16.2.123 | 172.16.2.123 |
| 31 | 172.16.2.124/31 | 172.16.2.124 – 172.16.2.125 | 172.16.2.125 |
| 32 | 172.16.2.126/31 | 172.16.2.126 – 172.16.2.127 | 172.16.2.127 |
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.