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)10.3.4.64/27
network10.3.4.64/27
broadcast10.3.4.95
first host10.3.4.65
last host10.3.4.94
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.3.4.64/27
address00001010.00000011.00000100.01000000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000011.00000100.01000000
broadcast00001010.00000011.00000100.01011111
green = network part, grey = host part
hex0x0a030440
decimal167969856
reverse dns64.4.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:440
/27 split into /32 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.3.4.64/32 | 10.3.4.64 – 10.3.4.64 | 10.3.4.64 |
| 2 | 10.3.4.65/32 | 10.3.4.65 – 10.3.4.65 | 10.3.4.65 |
| 3 | 10.3.4.66/32 | 10.3.4.66 – 10.3.4.66 | 10.3.4.66 |
| 4 | 10.3.4.67/32 | 10.3.4.67 – 10.3.4.67 | 10.3.4.67 |
| 5 | 10.3.4.68/32 | 10.3.4.68 – 10.3.4.68 | 10.3.4.68 |
| 6 | 10.3.4.69/32 | 10.3.4.69 – 10.3.4.69 | 10.3.4.69 |
| 7 | 10.3.4.70/32 | 10.3.4.70 – 10.3.4.70 | 10.3.4.70 |
| 8 | 10.3.4.71/32 | 10.3.4.71 – 10.3.4.71 | 10.3.4.71 |
| 9 | 10.3.4.72/32 | 10.3.4.72 – 10.3.4.72 | 10.3.4.72 |
| 10 | 10.3.4.73/32 | 10.3.4.73 – 10.3.4.73 | 10.3.4.73 |
| 11 | 10.3.4.74/32 | 10.3.4.74 – 10.3.4.74 | 10.3.4.74 |
| 12 | 10.3.4.75/32 | 10.3.4.75 – 10.3.4.75 | 10.3.4.75 |
| 13 | 10.3.4.76/32 | 10.3.4.76 – 10.3.4.76 | 10.3.4.76 |
| 14 | 10.3.4.77/32 | 10.3.4.77 – 10.3.4.77 | 10.3.4.77 |
| 15 | 10.3.4.78/32 | 10.3.4.78 – 10.3.4.78 | 10.3.4.78 |
| 16 | 10.3.4.79/32 | 10.3.4.79 – 10.3.4.79 | 10.3.4.79 |
| 17 | 10.3.4.80/32 | 10.3.4.80 – 10.3.4.80 | 10.3.4.80 |
| 18 | 10.3.4.81/32 | 10.3.4.81 – 10.3.4.81 | 10.3.4.81 |
| 19 | 10.3.4.82/32 | 10.3.4.82 – 10.3.4.82 | 10.3.4.82 |
| 20 | 10.3.4.83/32 | 10.3.4.83 – 10.3.4.83 | 10.3.4.83 |
| 21 | 10.3.4.84/32 | 10.3.4.84 – 10.3.4.84 | 10.3.4.84 |
| 22 | 10.3.4.85/32 | 10.3.4.85 – 10.3.4.85 | 10.3.4.85 |
| 23 | 10.3.4.86/32 | 10.3.4.86 – 10.3.4.86 | 10.3.4.86 |
| 24 | 10.3.4.87/32 | 10.3.4.87 – 10.3.4.87 | 10.3.4.87 |
| 25 | 10.3.4.88/32 | 10.3.4.88 – 10.3.4.88 | 10.3.4.88 |
| 26 | 10.3.4.89/32 | 10.3.4.89 – 10.3.4.89 | 10.3.4.89 |
| 27 | 10.3.4.90/32 | 10.3.4.90 – 10.3.4.90 | 10.3.4.90 |
| 28 | 10.3.4.91/32 | 10.3.4.91 – 10.3.4.91 | 10.3.4.91 |
| 29 | 10.3.4.92/32 | 10.3.4.92 – 10.3.4.92 | 10.3.4.92 |
| 30 | 10.3.4.93/32 | 10.3.4.93 – 10.3.4.93 | 10.3.4.93 |
| 31 | 10.3.4.94/32 | 10.3.4.94 – 10.3.4.94 | 10.3.4.94 |
| 32 | 10.3.4.95/32 | 10.3.4.95 – 10.3.4.95 | 10.3.4.95 |
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 /27 |
|---|---|---|---|---|
| /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 | - |
| /27 | 255.255.255.224 | 32 | 30 | 1 |
| /28 | 255.255.255.240 | 16 | 14 | 2 split → |
| /29 | 255.255.255.248 | 8 | 6 | 4 split → |
| /30 | 255.255.255.252 | 4 | 2 | 8 split → |
| /31 | 255.255.255.254 | 2 | 2 | 16 split → |
| /32 | 255.255.255.255 | 1 | 1 | 32 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.