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)10.20.128.0/19
network10.20.128.0/19
broadcast10.20.159.255
first host10.20.128.1
last host10.20.159.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.20.128.0/19
address00001010.00010100.10000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010100.10000000.00000000
broadcast00001010.00010100.10011111.11111111
green = network part, grey = host part
hex0x0a148000
decimal169115648
reverse dns0.128.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:8000
/19 split into /26 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.20.128.0/26 | 10.20.128.1 – 10.20.128.62 | 10.20.128.63 |
| 2 | 10.20.128.64/26 | 10.20.128.65 – 10.20.128.126 | 10.20.128.127 |
| 3 | 10.20.128.128/26 | 10.20.128.129 – 10.20.128.190 | 10.20.128.191 |
| 4 | 10.20.128.192/26 | 10.20.128.193 – 10.20.128.254 | 10.20.128.255 |
| 5 | 10.20.129.0/26 | 10.20.129.1 – 10.20.129.62 | 10.20.129.63 |
| 6 | 10.20.129.64/26 | 10.20.129.65 – 10.20.129.126 | 10.20.129.127 |
| 7 | 10.20.129.128/26 | 10.20.129.129 – 10.20.129.190 | 10.20.129.191 |
| 8 | 10.20.129.192/26 | 10.20.129.193 – 10.20.129.254 | 10.20.129.255 |
| 9 | 10.20.130.0/26 | 10.20.130.1 – 10.20.130.62 | 10.20.130.63 |
| 10 | 10.20.130.64/26 | 10.20.130.65 – 10.20.130.126 | 10.20.130.127 |
| 11 | 10.20.130.128/26 | 10.20.130.129 – 10.20.130.190 | 10.20.130.191 |
| 12 | 10.20.130.192/26 | 10.20.130.193 – 10.20.130.254 | 10.20.130.255 |
| 13 | 10.20.131.0/26 | 10.20.131.1 – 10.20.131.62 | 10.20.131.63 |
| 14 | 10.20.131.64/26 | 10.20.131.65 – 10.20.131.126 | 10.20.131.127 |
| 15 | 10.20.131.128/26 | 10.20.131.129 – 10.20.131.190 | 10.20.131.191 |
| 16 | 10.20.131.192/26 | 10.20.131.193 – 10.20.131.254 | 10.20.131.255 |
| 17 | 10.20.132.0/26 | 10.20.132.1 – 10.20.132.62 | 10.20.132.63 |
| 18 | 10.20.132.64/26 | 10.20.132.65 – 10.20.132.126 | 10.20.132.127 |
| 19 | 10.20.132.128/26 | 10.20.132.129 – 10.20.132.190 | 10.20.132.191 |
| 20 | 10.20.132.192/26 | 10.20.132.193 – 10.20.132.254 | 10.20.132.255 |
| 21 | 10.20.133.0/26 | 10.20.133.1 – 10.20.133.62 | 10.20.133.63 |
| 22 | 10.20.133.64/26 | 10.20.133.65 – 10.20.133.126 | 10.20.133.127 |
| 23 | 10.20.133.128/26 | 10.20.133.129 – 10.20.133.190 | 10.20.133.191 |
| 24 | 10.20.133.192/26 | 10.20.133.193 – 10.20.133.254 | 10.20.133.255 |
| 25 | 10.20.134.0/26 | 10.20.134.1 – 10.20.134.62 | 10.20.134.63 |
| 26 | 10.20.134.64/26 | 10.20.134.65 – 10.20.134.126 | 10.20.134.127 |
| 27 | 10.20.134.128/26 | 10.20.134.129 – 10.20.134.190 | 10.20.134.191 |
| 28 | 10.20.134.192/26 | 10.20.134.193 – 10.20.134.254 | 10.20.134.255 |
| 29 | 10.20.135.0/26 | 10.20.135.1 – 10.20.135.62 | 10.20.135.63 |
| 30 | 10.20.135.64/26 | 10.20.135.65 – 10.20.135.126 | 10.20.135.127 |
| 31 | 10.20.135.128/26 | 10.20.135.129 – 10.20.135.190 | 10.20.135.191 |
| 32 | 10.20.135.192/26 | 10.20.135.193 – 10.20.135.254 | 10.20.135.255 |
| 33 | 10.20.136.0/26 | 10.20.136.1 – 10.20.136.62 | 10.20.136.63 |
| 34 | 10.20.136.64/26 | 10.20.136.65 – 10.20.136.126 | 10.20.136.127 |
| 35 | 10.20.136.128/26 | 10.20.136.129 – 10.20.136.190 | 10.20.136.191 |
| 36 | 10.20.136.192/26 | 10.20.136.193 – 10.20.136.254 | 10.20.136.255 |
| 37 | 10.20.137.0/26 | 10.20.137.1 – 10.20.137.62 | 10.20.137.63 |
| 38 | 10.20.137.64/26 | 10.20.137.65 – 10.20.137.126 | 10.20.137.127 |
| 39 | 10.20.137.128/26 | 10.20.137.129 – 10.20.137.190 | 10.20.137.191 |
| 40 | 10.20.137.192/26 | 10.20.137.193 – 10.20.137.254 | 10.20.137.255 |
| 41 | 10.20.138.0/26 | 10.20.138.1 – 10.20.138.62 | 10.20.138.63 |
| 42 | 10.20.138.64/26 | 10.20.138.65 – 10.20.138.126 | 10.20.138.127 |
| 43 | 10.20.138.128/26 | 10.20.138.129 – 10.20.138.190 | 10.20.138.191 |
| 44 | 10.20.138.192/26 | 10.20.138.193 – 10.20.138.254 | 10.20.138.255 |
| 45 | 10.20.139.0/26 | 10.20.139.1 – 10.20.139.62 | 10.20.139.63 |
| 46 | 10.20.139.64/26 | 10.20.139.65 – 10.20.139.126 | 10.20.139.127 |
| 47 | 10.20.139.128/26 | 10.20.139.129 – 10.20.139.190 | 10.20.139.191 |
| 48 | 10.20.139.192/26 | 10.20.139.193 – 10.20.139.254 | 10.20.139.255 |
| 49 | 10.20.140.0/26 | 10.20.140.1 – 10.20.140.62 | 10.20.140.63 |
| 50 | 10.20.140.64/26 | 10.20.140.65 – 10.20.140.126 | 10.20.140.127 |
| 51 | 10.20.140.128/26 | 10.20.140.129 – 10.20.140.190 | 10.20.140.191 |
| 52 | 10.20.140.192/26 | 10.20.140.193 – 10.20.140.254 | 10.20.140.255 |
| 53 | 10.20.141.0/26 | 10.20.141.1 – 10.20.141.62 | 10.20.141.63 |
| 54 | 10.20.141.64/26 | 10.20.141.65 – 10.20.141.126 | 10.20.141.127 |
| 55 | 10.20.141.128/26 | 10.20.141.129 – 10.20.141.190 | 10.20.141.191 |
| 56 | 10.20.141.192/26 | 10.20.141.193 – 10.20.141.254 | 10.20.141.255 |
| 57 | 10.20.142.0/26 | 10.20.142.1 – 10.20.142.62 | 10.20.142.63 |
| 58 | 10.20.142.64/26 | 10.20.142.65 – 10.20.142.126 | 10.20.142.127 |
| 59 | 10.20.142.128/26 | 10.20.142.129 – 10.20.142.190 | 10.20.142.191 |
| 60 | 10.20.142.192/26 | 10.20.142.193 – 10.20.142.254 | 10.20.142.255 |
| 61 | 10.20.143.0/26 | 10.20.143.1 – 10.20.143.62 | 10.20.143.63 |
| 62 | 10.20.143.64/26 | 10.20.143.65 – 10.20.143.126 | 10.20.143.127 |
| 63 | 10.20.143.128/26 | 10.20.143.129 – 10.20.143.190 | 10.20.143.191 |
| 64 | 10.20.143.192/26 | 10.20.143.193 – 10.20.143.254 | 10.20.143.255 |
| 65 | 10.20.144.0/26 | 10.20.144.1 – 10.20.144.62 | 10.20.144.63 |
| 66 | 10.20.144.64/26 | 10.20.144.65 – 10.20.144.126 | 10.20.144.127 |
| 67 | 10.20.144.128/26 | 10.20.144.129 – 10.20.144.190 | 10.20.144.191 |
| 68 | 10.20.144.192/26 | 10.20.144.193 – 10.20.144.254 | 10.20.144.255 |
| 69 | 10.20.145.0/26 | 10.20.145.1 – 10.20.145.62 | 10.20.145.63 |
| 70 | 10.20.145.64/26 | 10.20.145.65 – 10.20.145.126 | 10.20.145.127 |
| 71 | 10.20.145.128/26 | 10.20.145.129 – 10.20.145.190 | 10.20.145.191 |
| 72 | 10.20.145.192/26 | 10.20.145.193 – 10.20.145.254 | 10.20.145.255 |
| 73 | 10.20.146.0/26 | 10.20.146.1 – 10.20.146.62 | 10.20.146.63 |
| 74 | 10.20.146.64/26 | 10.20.146.65 – 10.20.146.126 | 10.20.146.127 |
| 75 | 10.20.146.128/26 | 10.20.146.129 – 10.20.146.190 | 10.20.146.191 |
| 76 | 10.20.146.192/26 | 10.20.146.193 – 10.20.146.254 | 10.20.146.255 |
| 77 | 10.20.147.0/26 | 10.20.147.1 – 10.20.147.62 | 10.20.147.63 |
| 78 | 10.20.147.64/26 | 10.20.147.65 – 10.20.147.126 | 10.20.147.127 |
| 79 | 10.20.147.128/26 | 10.20.147.129 – 10.20.147.190 | 10.20.147.191 |
| 80 | 10.20.147.192/26 | 10.20.147.193 – 10.20.147.254 | 10.20.147.255 |
| 81 | 10.20.148.0/26 | 10.20.148.1 – 10.20.148.62 | 10.20.148.63 |
| 82 | 10.20.148.64/26 | 10.20.148.65 – 10.20.148.126 | 10.20.148.127 |
| 83 | 10.20.148.128/26 | 10.20.148.129 – 10.20.148.190 | 10.20.148.191 |
| 84 | 10.20.148.192/26 | 10.20.148.193 – 10.20.148.254 | 10.20.148.255 |
| 85 | 10.20.149.0/26 | 10.20.149.1 – 10.20.149.62 | 10.20.149.63 |
| 86 | 10.20.149.64/26 | 10.20.149.65 – 10.20.149.126 | 10.20.149.127 |
| 87 | 10.20.149.128/26 | 10.20.149.129 – 10.20.149.190 | 10.20.149.191 |
| 88 | 10.20.149.192/26 | 10.20.149.193 – 10.20.149.254 | 10.20.149.255 |
| 89 | 10.20.150.0/26 | 10.20.150.1 – 10.20.150.62 | 10.20.150.63 |
| 90 | 10.20.150.64/26 | 10.20.150.65 – 10.20.150.126 | 10.20.150.127 |
| 91 | 10.20.150.128/26 | 10.20.150.129 – 10.20.150.190 | 10.20.150.191 |
| 92 | 10.20.150.192/26 | 10.20.150.193 – 10.20.150.254 | 10.20.150.255 |
| 93 | 10.20.151.0/26 | 10.20.151.1 – 10.20.151.62 | 10.20.151.63 |
| 94 | 10.20.151.64/26 | 10.20.151.65 – 10.20.151.126 | 10.20.151.127 |
| 95 | 10.20.151.128/26 | 10.20.151.129 – 10.20.151.190 | 10.20.151.191 |
| 96 | 10.20.151.192/26 | 10.20.151.193 – 10.20.151.254 | 10.20.151.255 |
| 97 | 10.20.152.0/26 | 10.20.152.1 – 10.20.152.62 | 10.20.152.63 |
| 98 | 10.20.152.64/26 | 10.20.152.65 – 10.20.152.126 | 10.20.152.127 |
| 99 | 10.20.152.128/26 | 10.20.152.129 – 10.20.152.190 | 10.20.152.191 |
| 100 | 10.20.152.192/26 | 10.20.152.193 – 10.20.152.254 | 10.20.152.255 |
| 101 | 10.20.153.0/26 | 10.20.153.1 – 10.20.153.62 | 10.20.153.63 |
| 102 | 10.20.153.64/26 | 10.20.153.65 – 10.20.153.126 | 10.20.153.127 |
| 103 | 10.20.153.128/26 | 10.20.153.129 – 10.20.153.190 | 10.20.153.191 |
| 104 | 10.20.153.192/26 | 10.20.153.193 – 10.20.153.254 | 10.20.153.255 |
| 105 | 10.20.154.0/26 | 10.20.154.1 – 10.20.154.62 | 10.20.154.63 |
| 106 | 10.20.154.64/26 | 10.20.154.65 – 10.20.154.126 | 10.20.154.127 |
| 107 | 10.20.154.128/26 | 10.20.154.129 – 10.20.154.190 | 10.20.154.191 |
| 108 | 10.20.154.192/26 | 10.20.154.193 – 10.20.154.254 | 10.20.154.255 |
| 109 | 10.20.155.0/26 | 10.20.155.1 – 10.20.155.62 | 10.20.155.63 |
| 110 | 10.20.155.64/26 | 10.20.155.65 – 10.20.155.126 | 10.20.155.127 |
| 111 | 10.20.155.128/26 | 10.20.155.129 – 10.20.155.190 | 10.20.155.191 |
| 112 | 10.20.155.192/26 | 10.20.155.193 – 10.20.155.254 | 10.20.155.255 |
| 113 | 10.20.156.0/26 | 10.20.156.1 – 10.20.156.62 | 10.20.156.63 |
| 114 | 10.20.156.64/26 | 10.20.156.65 – 10.20.156.126 | 10.20.156.127 |
| 115 | 10.20.156.128/26 | 10.20.156.129 – 10.20.156.190 | 10.20.156.191 |
| 116 | 10.20.156.192/26 | 10.20.156.193 – 10.20.156.254 | 10.20.156.255 |
| 117 | 10.20.157.0/26 | 10.20.157.1 – 10.20.157.62 | 10.20.157.63 |
| 118 | 10.20.157.64/26 | 10.20.157.65 – 10.20.157.126 | 10.20.157.127 |
| 119 | 10.20.157.128/26 | 10.20.157.129 – 10.20.157.190 | 10.20.157.191 |
| 120 | 10.20.157.192/26 | 10.20.157.193 – 10.20.157.254 | 10.20.157.255 |
| 121 | 10.20.158.0/26 | 10.20.158.1 – 10.20.158.62 | 10.20.158.63 |
| 122 | 10.20.158.64/26 | 10.20.158.65 – 10.20.158.126 | 10.20.158.127 |
| 123 | 10.20.158.128/26 | 10.20.158.129 – 10.20.158.190 | 10.20.158.191 |
| 124 | 10.20.158.192/26 | 10.20.158.193 – 10.20.158.254 | 10.20.158.255 |
| 125 | 10.20.159.0/26 | 10.20.159.1 – 10.20.159.62 | 10.20.159.63 |
| 126 | 10.20.159.64/26 | 10.20.159.65 – 10.20.159.126 | 10.20.159.127 |
| 127 | 10.20.159.128/26 | 10.20.159.129 – 10.20.159.190 | 10.20.159.191 |
| 128 | 10.20.159.192/26 | 10.20.159.193 – 10.20.159.254 | 10.20.159.255 |
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.