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)10.80.0.0/12
network10.80.0.0/12
broadcast10.95.255.255
first host10.80.0.1
last host10.95.255.254
subnet mask255.240.0.0
wildcard0.15.255.255
addresses1,048,576
usable hosts1,048,574
classA
ipcalc 10.80.0.0/12
address00001010.01010000.00000000.00000000
subnet mask11111111.11110000.00000000.00000000
network00001010.01010000.00000000.00000000
broadcast00001010.01011111.11111111.11111111
green = network part, grey = host part
hex0x0a500000
decimal173015040
reverse dns0.0.80.10.in-addr.arpa
ipv4-mapped::ffff:a50:0
/12 split into /19 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.80.0.0/19 | 10.80.0.1 – 10.80.31.254 | 10.80.31.255 |
| 2 | 10.80.32.0/19 | 10.80.32.1 – 10.80.63.254 | 10.80.63.255 |
| 3 | 10.80.64.0/19 | 10.80.64.1 – 10.80.95.254 | 10.80.95.255 |
| 4 | 10.80.96.0/19 | 10.80.96.1 – 10.80.127.254 | 10.80.127.255 |
| 5 | 10.80.128.0/19 | 10.80.128.1 – 10.80.159.254 | 10.80.159.255 |
| 6 | 10.80.160.0/19 | 10.80.160.1 – 10.80.191.254 | 10.80.191.255 |
| 7 | 10.80.192.0/19 | 10.80.192.1 – 10.80.223.254 | 10.80.223.255 |
| 8 | 10.80.224.0/19 | 10.80.224.1 – 10.80.255.254 | 10.80.255.255 |
| 9 | 10.81.0.0/19 | 10.81.0.1 – 10.81.31.254 | 10.81.31.255 |
| 10 | 10.81.32.0/19 | 10.81.32.1 – 10.81.63.254 | 10.81.63.255 |
| 11 | 10.81.64.0/19 | 10.81.64.1 – 10.81.95.254 | 10.81.95.255 |
| 12 | 10.81.96.0/19 | 10.81.96.1 – 10.81.127.254 | 10.81.127.255 |
| 13 | 10.81.128.0/19 | 10.81.128.1 – 10.81.159.254 | 10.81.159.255 |
| 14 | 10.81.160.0/19 | 10.81.160.1 – 10.81.191.254 | 10.81.191.255 |
| 15 | 10.81.192.0/19 | 10.81.192.1 – 10.81.223.254 | 10.81.223.255 |
| 16 | 10.81.224.0/19 | 10.81.224.1 – 10.81.255.254 | 10.81.255.255 |
| 17 | 10.82.0.0/19 | 10.82.0.1 – 10.82.31.254 | 10.82.31.255 |
| 18 | 10.82.32.0/19 | 10.82.32.1 – 10.82.63.254 | 10.82.63.255 |
| 19 | 10.82.64.0/19 | 10.82.64.1 – 10.82.95.254 | 10.82.95.255 |
| 20 | 10.82.96.0/19 | 10.82.96.1 – 10.82.127.254 | 10.82.127.255 |
| 21 | 10.82.128.0/19 | 10.82.128.1 – 10.82.159.254 | 10.82.159.255 |
| 22 | 10.82.160.0/19 | 10.82.160.1 – 10.82.191.254 | 10.82.191.255 |
| 23 | 10.82.192.0/19 | 10.82.192.1 – 10.82.223.254 | 10.82.223.255 |
| 24 | 10.82.224.0/19 | 10.82.224.1 – 10.82.255.254 | 10.82.255.255 |
| 25 | 10.83.0.0/19 | 10.83.0.1 – 10.83.31.254 | 10.83.31.255 |
| 26 | 10.83.32.0/19 | 10.83.32.1 – 10.83.63.254 | 10.83.63.255 |
| 27 | 10.83.64.0/19 | 10.83.64.1 – 10.83.95.254 | 10.83.95.255 |
| 28 | 10.83.96.0/19 | 10.83.96.1 – 10.83.127.254 | 10.83.127.255 |
| 29 | 10.83.128.0/19 | 10.83.128.1 – 10.83.159.254 | 10.83.159.255 |
| 30 | 10.83.160.0/19 | 10.83.160.1 – 10.83.191.254 | 10.83.191.255 |
| 31 | 10.83.192.0/19 | 10.83.192.1 – 10.83.223.254 | 10.83.223.255 |
| 32 | 10.83.224.0/19 | 10.83.224.1 – 10.83.255.254 | 10.83.255.255 |
| 33 | 10.84.0.0/19 | 10.84.0.1 – 10.84.31.254 | 10.84.31.255 |
| 34 | 10.84.32.0/19 | 10.84.32.1 – 10.84.63.254 | 10.84.63.255 |
| 35 | 10.84.64.0/19 | 10.84.64.1 – 10.84.95.254 | 10.84.95.255 |
| 36 | 10.84.96.0/19 | 10.84.96.1 – 10.84.127.254 | 10.84.127.255 |
| 37 | 10.84.128.0/19 | 10.84.128.1 – 10.84.159.254 | 10.84.159.255 |
| 38 | 10.84.160.0/19 | 10.84.160.1 – 10.84.191.254 | 10.84.191.255 |
| 39 | 10.84.192.0/19 | 10.84.192.1 – 10.84.223.254 | 10.84.223.255 |
| 40 | 10.84.224.0/19 | 10.84.224.1 – 10.84.255.254 | 10.84.255.255 |
| 41 | 10.85.0.0/19 | 10.85.0.1 – 10.85.31.254 | 10.85.31.255 |
| 42 | 10.85.32.0/19 | 10.85.32.1 – 10.85.63.254 | 10.85.63.255 |
| 43 | 10.85.64.0/19 | 10.85.64.1 – 10.85.95.254 | 10.85.95.255 |
| 44 | 10.85.96.0/19 | 10.85.96.1 – 10.85.127.254 | 10.85.127.255 |
| 45 | 10.85.128.0/19 | 10.85.128.1 – 10.85.159.254 | 10.85.159.255 |
| 46 | 10.85.160.0/19 | 10.85.160.1 – 10.85.191.254 | 10.85.191.255 |
| 47 | 10.85.192.0/19 | 10.85.192.1 – 10.85.223.254 | 10.85.223.255 |
| 48 | 10.85.224.0/19 | 10.85.224.1 – 10.85.255.254 | 10.85.255.255 |
| 49 | 10.86.0.0/19 | 10.86.0.1 – 10.86.31.254 | 10.86.31.255 |
| 50 | 10.86.32.0/19 | 10.86.32.1 – 10.86.63.254 | 10.86.63.255 |
| 51 | 10.86.64.0/19 | 10.86.64.1 – 10.86.95.254 | 10.86.95.255 |
| 52 | 10.86.96.0/19 | 10.86.96.1 – 10.86.127.254 | 10.86.127.255 |
| 53 | 10.86.128.0/19 | 10.86.128.1 – 10.86.159.254 | 10.86.159.255 |
| 54 | 10.86.160.0/19 | 10.86.160.1 – 10.86.191.254 | 10.86.191.255 |
| 55 | 10.86.192.0/19 | 10.86.192.1 – 10.86.223.254 | 10.86.223.255 |
| 56 | 10.86.224.0/19 | 10.86.224.1 – 10.86.255.254 | 10.86.255.255 |
| 57 | 10.87.0.0/19 | 10.87.0.1 – 10.87.31.254 | 10.87.31.255 |
| 58 | 10.87.32.0/19 | 10.87.32.1 – 10.87.63.254 | 10.87.63.255 |
| 59 | 10.87.64.0/19 | 10.87.64.1 – 10.87.95.254 | 10.87.95.255 |
| 60 | 10.87.96.0/19 | 10.87.96.1 – 10.87.127.254 | 10.87.127.255 |
| 61 | 10.87.128.0/19 | 10.87.128.1 – 10.87.159.254 | 10.87.159.255 |
| 62 | 10.87.160.0/19 | 10.87.160.1 – 10.87.191.254 | 10.87.191.255 |
| 63 | 10.87.192.0/19 | 10.87.192.1 – 10.87.223.254 | 10.87.223.255 |
| 64 | 10.87.224.0/19 | 10.87.224.1 – 10.87.255.254 | 10.87.255.255 |
| 65 | 10.88.0.0/19 | 10.88.0.1 – 10.88.31.254 | 10.88.31.255 |
| 66 | 10.88.32.0/19 | 10.88.32.1 – 10.88.63.254 | 10.88.63.255 |
| 67 | 10.88.64.0/19 | 10.88.64.1 – 10.88.95.254 | 10.88.95.255 |
| 68 | 10.88.96.0/19 | 10.88.96.1 – 10.88.127.254 | 10.88.127.255 |
| 69 | 10.88.128.0/19 | 10.88.128.1 – 10.88.159.254 | 10.88.159.255 |
| 70 | 10.88.160.0/19 | 10.88.160.1 – 10.88.191.254 | 10.88.191.255 |
| 71 | 10.88.192.0/19 | 10.88.192.1 – 10.88.223.254 | 10.88.223.255 |
| 72 | 10.88.224.0/19 | 10.88.224.1 – 10.88.255.254 | 10.88.255.255 |
| 73 | 10.89.0.0/19 | 10.89.0.1 – 10.89.31.254 | 10.89.31.255 |
| 74 | 10.89.32.0/19 | 10.89.32.1 – 10.89.63.254 | 10.89.63.255 |
| 75 | 10.89.64.0/19 | 10.89.64.1 – 10.89.95.254 | 10.89.95.255 |
| 76 | 10.89.96.0/19 | 10.89.96.1 – 10.89.127.254 | 10.89.127.255 |
| 77 | 10.89.128.0/19 | 10.89.128.1 – 10.89.159.254 | 10.89.159.255 |
| 78 | 10.89.160.0/19 | 10.89.160.1 – 10.89.191.254 | 10.89.191.255 |
| 79 | 10.89.192.0/19 | 10.89.192.1 – 10.89.223.254 | 10.89.223.255 |
| 80 | 10.89.224.0/19 | 10.89.224.1 – 10.89.255.254 | 10.89.255.255 |
| 81 | 10.90.0.0/19 | 10.90.0.1 – 10.90.31.254 | 10.90.31.255 |
| 82 | 10.90.32.0/19 | 10.90.32.1 – 10.90.63.254 | 10.90.63.255 |
| 83 | 10.90.64.0/19 | 10.90.64.1 – 10.90.95.254 | 10.90.95.255 |
| 84 | 10.90.96.0/19 | 10.90.96.1 – 10.90.127.254 | 10.90.127.255 |
| 85 | 10.90.128.0/19 | 10.90.128.1 – 10.90.159.254 | 10.90.159.255 |
| 86 | 10.90.160.0/19 | 10.90.160.1 – 10.90.191.254 | 10.90.191.255 |
| 87 | 10.90.192.0/19 | 10.90.192.1 – 10.90.223.254 | 10.90.223.255 |
| 88 | 10.90.224.0/19 | 10.90.224.1 – 10.90.255.254 | 10.90.255.255 |
| 89 | 10.91.0.0/19 | 10.91.0.1 – 10.91.31.254 | 10.91.31.255 |
| 90 | 10.91.32.0/19 | 10.91.32.1 – 10.91.63.254 | 10.91.63.255 |
| 91 | 10.91.64.0/19 | 10.91.64.1 – 10.91.95.254 | 10.91.95.255 |
| 92 | 10.91.96.0/19 | 10.91.96.1 – 10.91.127.254 | 10.91.127.255 |
| 93 | 10.91.128.0/19 | 10.91.128.1 – 10.91.159.254 | 10.91.159.255 |
| 94 | 10.91.160.0/19 | 10.91.160.1 – 10.91.191.254 | 10.91.191.255 |
| 95 | 10.91.192.0/19 | 10.91.192.1 – 10.91.223.254 | 10.91.223.255 |
| 96 | 10.91.224.0/19 | 10.91.224.1 – 10.91.255.254 | 10.91.255.255 |
| 97 | 10.92.0.0/19 | 10.92.0.1 – 10.92.31.254 | 10.92.31.255 |
| 98 | 10.92.32.0/19 | 10.92.32.1 – 10.92.63.254 | 10.92.63.255 |
| 99 | 10.92.64.0/19 | 10.92.64.1 – 10.92.95.254 | 10.92.95.255 |
| 100 | 10.92.96.0/19 | 10.92.96.1 – 10.92.127.254 | 10.92.127.255 |
| 101 | 10.92.128.0/19 | 10.92.128.1 – 10.92.159.254 | 10.92.159.255 |
| 102 | 10.92.160.0/19 | 10.92.160.1 – 10.92.191.254 | 10.92.191.255 |
| 103 | 10.92.192.0/19 | 10.92.192.1 – 10.92.223.254 | 10.92.223.255 |
| 104 | 10.92.224.0/19 | 10.92.224.1 – 10.92.255.254 | 10.92.255.255 |
| 105 | 10.93.0.0/19 | 10.93.0.1 – 10.93.31.254 | 10.93.31.255 |
| 106 | 10.93.32.0/19 | 10.93.32.1 – 10.93.63.254 | 10.93.63.255 |
| 107 | 10.93.64.0/19 | 10.93.64.1 – 10.93.95.254 | 10.93.95.255 |
| 108 | 10.93.96.0/19 | 10.93.96.1 – 10.93.127.254 | 10.93.127.255 |
| 109 | 10.93.128.0/19 | 10.93.128.1 – 10.93.159.254 | 10.93.159.255 |
| 110 | 10.93.160.0/19 | 10.93.160.1 – 10.93.191.254 | 10.93.191.255 |
| 111 | 10.93.192.0/19 | 10.93.192.1 – 10.93.223.254 | 10.93.223.255 |
| 112 | 10.93.224.0/19 | 10.93.224.1 – 10.93.255.254 | 10.93.255.255 |
| 113 | 10.94.0.0/19 | 10.94.0.1 – 10.94.31.254 | 10.94.31.255 |
| 114 | 10.94.32.0/19 | 10.94.32.1 – 10.94.63.254 | 10.94.63.255 |
| 115 | 10.94.64.0/19 | 10.94.64.1 – 10.94.95.254 | 10.94.95.255 |
| 116 | 10.94.96.0/19 | 10.94.96.1 – 10.94.127.254 | 10.94.127.255 |
| 117 | 10.94.128.0/19 | 10.94.128.1 – 10.94.159.254 | 10.94.159.255 |
| 118 | 10.94.160.0/19 | 10.94.160.1 – 10.94.191.254 | 10.94.191.255 |
| 119 | 10.94.192.0/19 | 10.94.192.1 – 10.94.223.254 | 10.94.223.255 |
| 120 | 10.94.224.0/19 | 10.94.224.1 – 10.94.255.254 | 10.94.255.255 |
| 121 | 10.95.0.0/19 | 10.95.0.1 – 10.95.31.254 | 10.95.31.255 |
| 122 | 10.95.32.0/19 | 10.95.32.1 – 10.95.63.254 | 10.95.63.255 |
| 123 | 10.95.64.0/19 | 10.95.64.1 – 10.95.95.254 | 10.95.95.255 |
| 124 | 10.95.96.0/19 | 10.95.96.1 – 10.95.127.254 | 10.95.127.255 |
| 125 | 10.95.128.0/19 | 10.95.128.1 – 10.95.159.254 | 10.95.159.255 |
| 126 | 10.95.160.0/19 | 10.95.160.1 – 10.95.191.254 | 10.95.191.255 |
| 127 | 10.95.192.0/19 | 10.95.192.1 – 10.95.223.254 | 10.95.223.255 |
| 128 | 10.95.224.0/19 | 10.95.224.1 – 10.95.255.254 | 10.95.255.255 |
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 /12 |
|---|---|---|---|---|
| /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 | 1 |
| /13 | 255.248.0.0 | 524,288 | 524,286 | 2 split → |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 4 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 8 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 16 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 32 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 64 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 128 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 256 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 512 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 1,024 split → |
| /23 | 255.255.254.0 | 512 | 510 | 2,048 split → |
| /24 | 255.255.255.0 | 256 | 254 | 4,096 split → |
| /25 | 255.255.255.128 | 128 | 126 | 8,192 split → |
| /26 | 255.255.255.192 | 64 | 62 | 16,384 split → |
| /27 | 255.255.255.224 | 32 | 30 | 32,768 split → |
| /28 | 255.255.255.240 | 16 | 14 | 65,536 split → |
| /29 | 255.255.255.248 | 8 | 6 | 131,072 split → |
| /30 | 255.255.255.252 | 4 | 2 | 262,144 split → |
| /31 | 255.255.255.254 | 2 | 2 | 524,288 split → |
| /32 | 255.255.255.255 | 1 | 1 | 1,048,576 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.