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)10.21.96.0/19
network10.21.96.0/19
broadcast10.21.127.255
first host10.21.96.1
last host10.21.127.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.21.96.0/19
address00001010.00010101.01100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010101.01100000.00000000
broadcast00001010.00010101.01111111.11111111
green = network part, grey = host part
hex0x0a156000
decimal169172992
reverse dns0.96.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:6000
/19 split into /26 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.96.0/26 | 10.21.96.1 – 10.21.96.62 | 10.21.96.63 |
| 2 | 10.21.96.64/26 | 10.21.96.65 – 10.21.96.126 | 10.21.96.127 |
| 3 | 10.21.96.128/26 | 10.21.96.129 – 10.21.96.190 | 10.21.96.191 |
| 4 | 10.21.96.192/26 | 10.21.96.193 – 10.21.96.254 | 10.21.96.255 |
| 5 | 10.21.97.0/26 | 10.21.97.1 – 10.21.97.62 | 10.21.97.63 |
| 6 | 10.21.97.64/26 | 10.21.97.65 – 10.21.97.126 | 10.21.97.127 |
| 7 | 10.21.97.128/26 | 10.21.97.129 – 10.21.97.190 | 10.21.97.191 |
| 8 | 10.21.97.192/26 | 10.21.97.193 – 10.21.97.254 | 10.21.97.255 |
| 9 | 10.21.98.0/26 | 10.21.98.1 – 10.21.98.62 | 10.21.98.63 |
| 10 | 10.21.98.64/26 | 10.21.98.65 – 10.21.98.126 | 10.21.98.127 |
| 11 | 10.21.98.128/26 | 10.21.98.129 – 10.21.98.190 | 10.21.98.191 |
| 12 | 10.21.98.192/26 | 10.21.98.193 – 10.21.98.254 | 10.21.98.255 |
| 13 | 10.21.99.0/26 | 10.21.99.1 – 10.21.99.62 | 10.21.99.63 |
| 14 | 10.21.99.64/26 | 10.21.99.65 – 10.21.99.126 | 10.21.99.127 |
| 15 | 10.21.99.128/26 | 10.21.99.129 – 10.21.99.190 | 10.21.99.191 |
| 16 | 10.21.99.192/26 | 10.21.99.193 – 10.21.99.254 | 10.21.99.255 |
| 17 | 10.21.100.0/26 | 10.21.100.1 – 10.21.100.62 | 10.21.100.63 |
| 18 | 10.21.100.64/26 | 10.21.100.65 – 10.21.100.126 | 10.21.100.127 |
| 19 | 10.21.100.128/26 | 10.21.100.129 – 10.21.100.190 | 10.21.100.191 |
| 20 | 10.21.100.192/26 | 10.21.100.193 – 10.21.100.254 | 10.21.100.255 |
| 21 | 10.21.101.0/26 | 10.21.101.1 – 10.21.101.62 | 10.21.101.63 |
| 22 | 10.21.101.64/26 | 10.21.101.65 – 10.21.101.126 | 10.21.101.127 |
| 23 | 10.21.101.128/26 | 10.21.101.129 – 10.21.101.190 | 10.21.101.191 |
| 24 | 10.21.101.192/26 | 10.21.101.193 – 10.21.101.254 | 10.21.101.255 |
| 25 | 10.21.102.0/26 | 10.21.102.1 – 10.21.102.62 | 10.21.102.63 |
| 26 | 10.21.102.64/26 | 10.21.102.65 – 10.21.102.126 | 10.21.102.127 |
| 27 | 10.21.102.128/26 | 10.21.102.129 – 10.21.102.190 | 10.21.102.191 |
| 28 | 10.21.102.192/26 | 10.21.102.193 – 10.21.102.254 | 10.21.102.255 |
| 29 | 10.21.103.0/26 | 10.21.103.1 – 10.21.103.62 | 10.21.103.63 |
| 30 | 10.21.103.64/26 | 10.21.103.65 – 10.21.103.126 | 10.21.103.127 |
| 31 | 10.21.103.128/26 | 10.21.103.129 – 10.21.103.190 | 10.21.103.191 |
| 32 | 10.21.103.192/26 | 10.21.103.193 – 10.21.103.254 | 10.21.103.255 |
| 33 | 10.21.104.0/26 | 10.21.104.1 – 10.21.104.62 | 10.21.104.63 |
| 34 | 10.21.104.64/26 | 10.21.104.65 – 10.21.104.126 | 10.21.104.127 |
| 35 | 10.21.104.128/26 | 10.21.104.129 – 10.21.104.190 | 10.21.104.191 |
| 36 | 10.21.104.192/26 | 10.21.104.193 – 10.21.104.254 | 10.21.104.255 |
| 37 | 10.21.105.0/26 | 10.21.105.1 – 10.21.105.62 | 10.21.105.63 |
| 38 | 10.21.105.64/26 | 10.21.105.65 – 10.21.105.126 | 10.21.105.127 |
| 39 | 10.21.105.128/26 | 10.21.105.129 – 10.21.105.190 | 10.21.105.191 |
| 40 | 10.21.105.192/26 | 10.21.105.193 – 10.21.105.254 | 10.21.105.255 |
| 41 | 10.21.106.0/26 | 10.21.106.1 – 10.21.106.62 | 10.21.106.63 |
| 42 | 10.21.106.64/26 | 10.21.106.65 – 10.21.106.126 | 10.21.106.127 |
| 43 | 10.21.106.128/26 | 10.21.106.129 – 10.21.106.190 | 10.21.106.191 |
| 44 | 10.21.106.192/26 | 10.21.106.193 – 10.21.106.254 | 10.21.106.255 |
| 45 | 10.21.107.0/26 | 10.21.107.1 – 10.21.107.62 | 10.21.107.63 |
| 46 | 10.21.107.64/26 | 10.21.107.65 – 10.21.107.126 | 10.21.107.127 |
| 47 | 10.21.107.128/26 | 10.21.107.129 – 10.21.107.190 | 10.21.107.191 |
| 48 | 10.21.107.192/26 | 10.21.107.193 – 10.21.107.254 | 10.21.107.255 |
| 49 | 10.21.108.0/26 | 10.21.108.1 – 10.21.108.62 | 10.21.108.63 |
| 50 | 10.21.108.64/26 | 10.21.108.65 – 10.21.108.126 | 10.21.108.127 |
| 51 | 10.21.108.128/26 | 10.21.108.129 – 10.21.108.190 | 10.21.108.191 |
| 52 | 10.21.108.192/26 | 10.21.108.193 – 10.21.108.254 | 10.21.108.255 |
| 53 | 10.21.109.0/26 | 10.21.109.1 – 10.21.109.62 | 10.21.109.63 |
| 54 | 10.21.109.64/26 | 10.21.109.65 – 10.21.109.126 | 10.21.109.127 |
| 55 | 10.21.109.128/26 | 10.21.109.129 – 10.21.109.190 | 10.21.109.191 |
| 56 | 10.21.109.192/26 | 10.21.109.193 – 10.21.109.254 | 10.21.109.255 |
| 57 | 10.21.110.0/26 | 10.21.110.1 – 10.21.110.62 | 10.21.110.63 |
| 58 | 10.21.110.64/26 | 10.21.110.65 – 10.21.110.126 | 10.21.110.127 |
| 59 | 10.21.110.128/26 | 10.21.110.129 – 10.21.110.190 | 10.21.110.191 |
| 60 | 10.21.110.192/26 | 10.21.110.193 – 10.21.110.254 | 10.21.110.255 |
| 61 | 10.21.111.0/26 | 10.21.111.1 – 10.21.111.62 | 10.21.111.63 |
| 62 | 10.21.111.64/26 | 10.21.111.65 – 10.21.111.126 | 10.21.111.127 |
| 63 | 10.21.111.128/26 | 10.21.111.129 – 10.21.111.190 | 10.21.111.191 |
| 64 | 10.21.111.192/26 | 10.21.111.193 – 10.21.111.254 | 10.21.111.255 |
| 65 | 10.21.112.0/26 | 10.21.112.1 – 10.21.112.62 | 10.21.112.63 |
| 66 | 10.21.112.64/26 | 10.21.112.65 – 10.21.112.126 | 10.21.112.127 |
| 67 | 10.21.112.128/26 | 10.21.112.129 – 10.21.112.190 | 10.21.112.191 |
| 68 | 10.21.112.192/26 | 10.21.112.193 – 10.21.112.254 | 10.21.112.255 |
| 69 | 10.21.113.0/26 | 10.21.113.1 – 10.21.113.62 | 10.21.113.63 |
| 70 | 10.21.113.64/26 | 10.21.113.65 – 10.21.113.126 | 10.21.113.127 |
| 71 | 10.21.113.128/26 | 10.21.113.129 – 10.21.113.190 | 10.21.113.191 |
| 72 | 10.21.113.192/26 | 10.21.113.193 – 10.21.113.254 | 10.21.113.255 |
| 73 | 10.21.114.0/26 | 10.21.114.1 – 10.21.114.62 | 10.21.114.63 |
| 74 | 10.21.114.64/26 | 10.21.114.65 – 10.21.114.126 | 10.21.114.127 |
| 75 | 10.21.114.128/26 | 10.21.114.129 – 10.21.114.190 | 10.21.114.191 |
| 76 | 10.21.114.192/26 | 10.21.114.193 – 10.21.114.254 | 10.21.114.255 |
| 77 | 10.21.115.0/26 | 10.21.115.1 – 10.21.115.62 | 10.21.115.63 |
| 78 | 10.21.115.64/26 | 10.21.115.65 – 10.21.115.126 | 10.21.115.127 |
| 79 | 10.21.115.128/26 | 10.21.115.129 – 10.21.115.190 | 10.21.115.191 |
| 80 | 10.21.115.192/26 | 10.21.115.193 – 10.21.115.254 | 10.21.115.255 |
| 81 | 10.21.116.0/26 | 10.21.116.1 – 10.21.116.62 | 10.21.116.63 |
| 82 | 10.21.116.64/26 | 10.21.116.65 – 10.21.116.126 | 10.21.116.127 |
| 83 | 10.21.116.128/26 | 10.21.116.129 – 10.21.116.190 | 10.21.116.191 |
| 84 | 10.21.116.192/26 | 10.21.116.193 – 10.21.116.254 | 10.21.116.255 |
| 85 | 10.21.117.0/26 | 10.21.117.1 – 10.21.117.62 | 10.21.117.63 |
| 86 | 10.21.117.64/26 | 10.21.117.65 – 10.21.117.126 | 10.21.117.127 |
| 87 | 10.21.117.128/26 | 10.21.117.129 – 10.21.117.190 | 10.21.117.191 |
| 88 | 10.21.117.192/26 | 10.21.117.193 – 10.21.117.254 | 10.21.117.255 |
| 89 | 10.21.118.0/26 | 10.21.118.1 – 10.21.118.62 | 10.21.118.63 |
| 90 | 10.21.118.64/26 | 10.21.118.65 – 10.21.118.126 | 10.21.118.127 |
| 91 | 10.21.118.128/26 | 10.21.118.129 – 10.21.118.190 | 10.21.118.191 |
| 92 | 10.21.118.192/26 | 10.21.118.193 – 10.21.118.254 | 10.21.118.255 |
| 93 | 10.21.119.0/26 | 10.21.119.1 – 10.21.119.62 | 10.21.119.63 |
| 94 | 10.21.119.64/26 | 10.21.119.65 – 10.21.119.126 | 10.21.119.127 |
| 95 | 10.21.119.128/26 | 10.21.119.129 – 10.21.119.190 | 10.21.119.191 |
| 96 | 10.21.119.192/26 | 10.21.119.193 – 10.21.119.254 | 10.21.119.255 |
| 97 | 10.21.120.0/26 | 10.21.120.1 – 10.21.120.62 | 10.21.120.63 |
| 98 | 10.21.120.64/26 | 10.21.120.65 – 10.21.120.126 | 10.21.120.127 |
| 99 | 10.21.120.128/26 | 10.21.120.129 – 10.21.120.190 | 10.21.120.191 |
| 100 | 10.21.120.192/26 | 10.21.120.193 – 10.21.120.254 | 10.21.120.255 |
| 101 | 10.21.121.0/26 | 10.21.121.1 – 10.21.121.62 | 10.21.121.63 |
| 102 | 10.21.121.64/26 | 10.21.121.65 – 10.21.121.126 | 10.21.121.127 |
| 103 | 10.21.121.128/26 | 10.21.121.129 – 10.21.121.190 | 10.21.121.191 |
| 104 | 10.21.121.192/26 | 10.21.121.193 – 10.21.121.254 | 10.21.121.255 |
| 105 | 10.21.122.0/26 | 10.21.122.1 – 10.21.122.62 | 10.21.122.63 |
| 106 | 10.21.122.64/26 | 10.21.122.65 – 10.21.122.126 | 10.21.122.127 |
| 107 | 10.21.122.128/26 | 10.21.122.129 – 10.21.122.190 | 10.21.122.191 |
| 108 | 10.21.122.192/26 | 10.21.122.193 – 10.21.122.254 | 10.21.122.255 |
| 109 | 10.21.123.0/26 | 10.21.123.1 – 10.21.123.62 | 10.21.123.63 |
| 110 | 10.21.123.64/26 | 10.21.123.65 – 10.21.123.126 | 10.21.123.127 |
| 111 | 10.21.123.128/26 | 10.21.123.129 – 10.21.123.190 | 10.21.123.191 |
| 112 | 10.21.123.192/26 | 10.21.123.193 – 10.21.123.254 | 10.21.123.255 |
| 113 | 10.21.124.0/26 | 10.21.124.1 – 10.21.124.62 | 10.21.124.63 |
| 114 | 10.21.124.64/26 | 10.21.124.65 – 10.21.124.126 | 10.21.124.127 |
| 115 | 10.21.124.128/26 | 10.21.124.129 – 10.21.124.190 | 10.21.124.191 |
| 116 | 10.21.124.192/26 | 10.21.124.193 – 10.21.124.254 | 10.21.124.255 |
| 117 | 10.21.125.0/26 | 10.21.125.1 – 10.21.125.62 | 10.21.125.63 |
| 118 | 10.21.125.64/26 | 10.21.125.65 – 10.21.125.126 | 10.21.125.127 |
| 119 | 10.21.125.128/26 | 10.21.125.129 – 10.21.125.190 | 10.21.125.191 |
| 120 | 10.21.125.192/26 | 10.21.125.193 – 10.21.125.254 | 10.21.125.255 |
| 121 | 10.21.126.0/26 | 10.21.126.1 – 10.21.126.62 | 10.21.126.63 |
| 122 | 10.21.126.64/26 | 10.21.126.65 – 10.21.126.126 | 10.21.126.127 |
| 123 | 10.21.126.128/26 | 10.21.126.129 – 10.21.126.190 | 10.21.126.191 |
| 124 | 10.21.126.192/26 | 10.21.126.193 – 10.21.126.254 | 10.21.126.255 |
| 125 | 10.21.127.0/26 | 10.21.127.1 – 10.21.127.62 | 10.21.127.63 |
| 126 | 10.21.127.64/26 | 10.21.127.65 – 10.21.127.126 | 10.21.127.127 |
| 127 | 10.21.127.128/26 | 10.21.127.129 – 10.21.127.190 | 10.21.127.191 |
| 128 | 10.21.127.192/26 | 10.21.127.193 – 10.21.127.254 | 10.21.127.255 |
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 /19 |
|---|---|---|---|---|
| /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 | 1 |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 2 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 4 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 8 split → |
| /23 | 255.255.254.0 | 512 | 510 | 16 split → |
| /24 | 255.255.255.0 | 256 | 254 | 32 split → |
| /25 | 255.255.255.128 | 128 | 126 | 64 split → |
| /26 | 255.255.255.192 | 64 | 62 | 128 split → |
| /27 | 255.255.255.224 | 32 | 30 | 256 split → |
| /28 | 255.255.255.240 | 16 | 14 | 512 split → |
| /29 | 255.255.255.248 | 8 | 6 | 1,024 split → |
| /30 | 255.255.255.252 | 4 | 2 | 2,048 split → |
| /31 | 255.255.255.254 | 2 | 2 | 4,096 split → |
| /32 | 255.255.255.255 | 1 | 1 | 8,192 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.