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)10.0.192.0/20
network10.0.192.0/20
broadcast10.0.207.255
first host10.0.192.1
last host10.0.207.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.0.192.0/20
address00001010.00000000.11000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000000.11000000.00000000
broadcast00001010.00000000.11001111.11111111
green = network part, grey = host part
hex0x0a00c000
decimal167821312
reverse dns0.192.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:c000
/20 split into /27 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.0.192.0/27 | 10.0.192.1 – 10.0.192.30 | 10.0.192.31 |
| 2 | 10.0.192.32/27 | 10.0.192.33 – 10.0.192.62 | 10.0.192.63 |
| 3 | 10.0.192.64/27 | 10.0.192.65 – 10.0.192.94 | 10.0.192.95 |
| 4 | 10.0.192.96/27 | 10.0.192.97 – 10.0.192.126 | 10.0.192.127 |
| 5 | 10.0.192.128/27 | 10.0.192.129 – 10.0.192.158 | 10.0.192.159 |
| 6 | 10.0.192.160/27 | 10.0.192.161 – 10.0.192.190 | 10.0.192.191 |
| 7 | 10.0.192.192/27 | 10.0.192.193 – 10.0.192.222 | 10.0.192.223 |
| 8 | 10.0.192.224/27 | 10.0.192.225 – 10.0.192.254 | 10.0.192.255 |
| 9 | 10.0.193.0/27 | 10.0.193.1 – 10.0.193.30 | 10.0.193.31 |
| 10 | 10.0.193.32/27 | 10.0.193.33 – 10.0.193.62 | 10.0.193.63 |
| 11 | 10.0.193.64/27 | 10.0.193.65 – 10.0.193.94 | 10.0.193.95 |
| 12 | 10.0.193.96/27 | 10.0.193.97 – 10.0.193.126 | 10.0.193.127 |
| 13 | 10.0.193.128/27 | 10.0.193.129 – 10.0.193.158 | 10.0.193.159 |
| 14 | 10.0.193.160/27 | 10.0.193.161 – 10.0.193.190 | 10.0.193.191 |
| 15 | 10.0.193.192/27 | 10.0.193.193 – 10.0.193.222 | 10.0.193.223 |
| 16 | 10.0.193.224/27 | 10.0.193.225 – 10.0.193.254 | 10.0.193.255 |
| 17 | 10.0.194.0/27 | 10.0.194.1 – 10.0.194.30 | 10.0.194.31 |
| 18 | 10.0.194.32/27 | 10.0.194.33 – 10.0.194.62 | 10.0.194.63 |
| 19 | 10.0.194.64/27 | 10.0.194.65 – 10.0.194.94 | 10.0.194.95 |
| 20 | 10.0.194.96/27 | 10.0.194.97 – 10.0.194.126 | 10.0.194.127 |
| 21 | 10.0.194.128/27 | 10.0.194.129 – 10.0.194.158 | 10.0.194.159 |
| 22 | 10.0.194.160/27 | 10.0.194.161 – 10.0.194.190 | 10.0.194.191 |
| 23 | 10.0.194.192/27 | 10.0.194.193 – 10.0.194.222 | 10.0.194.223 |
| 24 | 10.0.194.224/27 | 10.0.194.225 – 10.0.194.254 | 10.0.194.255 |
| 25 | 10.0.195.0/27 | 10.0.195.1 – 10.0.195.30 | 10.0.195.31 |
| 26 | 10.0.195.32/27 | 10.0.195.33 – 10.0.195.62 | 10.0.195.63 |
| 27 | 10.0.195.64/27 | 10.0.195.65 – 10.0.195.94 | 10.0.195.95 |
| 28 | 10.0.195.96/27 | 10.0.195.97 – 10.0.195.126 | 10.0.195.127 |
| 29 | 10.0.195.128/27 | 10.0.195.129 – 10.0.195.158 | 10.0.195.159 |
| 30 | 10.0.195.160/27 | 10.0.195.161 – 10.0.195.190 | 10.0.195.191 |
| 31 | 10.0.195.192/27 | 10.0.195.193 – 10.0.195.222 | 10.0.195.223 |
| 32 | 10.0.195.224/27 | 10.0.195.225 – 10.0.195.254 | 10.0.195.255 |
| 33 | 10.0.196.0/27 | 10.0.196.1 – 10.0.196.30 | 10.0.196.31 |
| 34 | 10.0.196.32/27 | 10.0.196.33 – 10.0.196.62 | 10.0.196.63 |
| 35 | 10.0.196.64/27 | 10.0.196.65 – 10.0.196.94 | 10.0.196.95 |
| 36 | 10.0.196.96/27 | 10.0.196.97 – 10.0.196.126 | 10.0.196.127 |
| 37 | 10.0.196.128/27 | 10.0.196.129 – 10.0.196.158 | 10.0.196.159 |
| 38 | 10.0.196.160/27 | 10.0.196.161 – 10.0.196.190 | 10.0.196.191 |
| 39 | 10.0.196.192/27 | 10.0.196.193 – 10.0.196.222 | 10.0.196.223 |
| 40 | 10.0.196.224/27 | 10.0.196.225 – 10.0.196.254 | 10.0.196.255 |
| 41 | 10.0.197.0/27 | 10.0.197.1 – 10.0.197.30 | 10.0.197.31 |
| 42 | 10.0.197.32/27 | 10.0.197.33 – 10.0.197.62 | 10.0.197.63 |
| 43 | 10.0.197.64/27 | 10.0.197.65 – 10.0.197.94 | 10.0.197.95 |
| 44 | 10.0.197.96/27 | 10.0.197.97 – 10.0.197.126 | 10.0.197.127 |
| 45 | 10.0.197.128/27 | 10.0.197.129 – 10.0.197.158 | 10.0.197.159 |
| 46 | 10.0.197.160/27 | 10.0.197.161 – 10.0.197.190 | 10.0.197.191 |
| 47 | 10.0.197.192/27 | 10.0.197.193 – 10.0.197.222 | 10.0.197.223 |
| 48 | 10.0.197.224/27 | 10.0.197.225 – 10.0.197.254 | 10.0.197.255 |
| 49 | 10.0.198.0/27 | 10.0.198.1 – 10.0.198.30 | 10.0.198.31 |
| 50 | 10.0.198.32/27 | 10.0.198.33 – 10.0.198.62 | 10.0.198.63 |
| 51 | 10.0.198.64/27 | 10.0.198.65 – 10.0.198.94 | 10.0.198.95 |
| 52 | 10.0.198.96/27 | 10.0.198.97 – 10.0.198.126 | 10.0.198.127 |
| 53 | 10.0.198.128/27 | 10.0.198.129 – 10.0.198.158 | 10.0.198.159 |
| 54 | 10.0.198.160/27 | 10.0.198.161 – 10.0.198.190 | 10.0.198.191 |
| 55 | 10.0.198.192/27 | 10.0.198.193 – 10.0.198.222 | 10.0.198.223 |
| 56 | 10.0.198.224/27 | 10.0.198.225 – 10.0.198.254 | 10.0.198.255 |
| 57 | 10.0.199.0/27 | 10.0.199.1 – 10.0.199.30 | 10.0.199.31 |
| 58 | 10.0.199.32/27 | 10.0.199.33 – 10.0.199.62 | 10.0.199.63 |
| 59 | 10.0.199.64/27 | 10.0.199.65 – 10.0.199.94 | 10.0.199.95 |
| 60 | 10.0.199.96/27 | 10.0.199.97 – 10.0.199.126 | 10.0.199.127 |
| 61 | 10.0.199.128/27 | 10.0.199.129 – 10.0.199.158 | 10.0.199.159 |
| 62 | 10.0.199.160/27 | 10.0.199.161 – 10.0.199.190 | 10.0.199.191 |
| 63 | 10.0.199.192/27 | 10.0.199.193 – 10.0.199.222 | 10.0.199.223 |
| 64 | 10.0.199.224/27 | 10.0.199.225 – 10.0.199.254 | 10.0.199.255 |
| 65 | 10.0.200.0/27 | 10.0.200.1 – 10.0.200.30 | 10.0.200.31 |
| 66 | 10.0.200.32/27 | 10.0.200.33 – 10.0.200.62 | 10.0.200.63 |
| 67 | 10.0.200.64/27 | 10.0.200.65 – 10.0.200.94 | 10.0.200.95 |
| 68 | 10.0.200.96/27 | 10.0.200.97 – 10.0.200.126 | 10.0.200.127 |
| 69 | 10.0.200.128/27 | 10.0.200.129 – 10.0.200.158 | 10.0.200.159 |
| 70 | 10.0.200.160/27 | 10.0.200.161 – 10.0.200.190 | 10.0.200.191 |
| 71 | 10.0.200.192/27 | 10.0.200.193 – 10.0.200.222 | 10.0.200.223 |
| 72 | 10.0.200.224/27 | 10.0.200.225 – 10.0.200.254 | 10.0.200.255 |
| 73 | 10.0.201.0/27 | 10.0.201.1 – 10.0.201.30 | 10.0.201.31 |
| 74 | 10.0.201.32/27 | 10.0.201.33 – 10.0.201.62 | 10.0.201.63 |
| 75 | 10.0.201.64/27 | 10.0.201.65 – 10.0.201.94 | 10.0.201.95 |
| 76 | 10.0.201.96/27 | 10.0.201.97 – 10.0.201.126 | 10.0.201.127 |
| 77 | 10.0.201.128/27 | 10.0.201.129 – 10.0.201.158 | 10.0.201.159 |
| 78 | 10.0.201.160/27 | 10.0.201.161 – 10.0.201.190 | 10.0.201.191 |
| 79 | 10.0.201.192/27 | 10.0.201.193 – 10.0.201.222 | 10.0.201.223 |
| 80 | 10.0.201.224/27 | 10.0.201.225 – 10.0.201.254 | 10.0.201.255 |
| 81 | 10.0.202.0/27 | 10.0.202.1 – 10.0.202.30 | 10.0.202.31 |
| 82 | 10.0.202.32/27 | 10.0.202.33 – 10.0.202.62 | 10.0.202.63 |
| 83 | 10.0.202.64/27 | 10.0.202.65 – 10.0.202.94 | 10.0.202.95 |
| 84 | 10.0.202.96/27 | 10.0.202.97 – 10.0.202.126 | 10.0.202.127 |
| 85 | 10.0.202.128/27 | 10.0.202.129 – 10.0.202.158 | 10.0.202.159 |
| 86 | 10.0.202.160/27 | 10.0.202.161 – 10.0.202.190 | 10.0.202.191 |
| 87 | 10.0.202.192/27 | 10.0.202.193 – 10.0.202.222 | 10.0.202.223 |
| 88 | 10.0.202.224/27 | 10.0.202.225 – 10.0.202.254 | 10.0.202.255 |
| 89 | 10.0.203.0/27 | 10.0.203.1 – 10.0.203.30 | 10.0.203.31 |
| 90 | 10.0.203.32/27 | 10.0.203.33 – 10.0.203.62 | 10.0.203.63 |
| 91 | 10.0.203.64/27 | 10.0.203.65 – 10.0.203.94 | 10.0.203.95 |
| 92 | 10.0.203.96/27 | 10.0.203.97 – 10.0.203.126 | 10.0.203.127 |
| 93 | 10.0.203.128/27 | 10.0.203.129 – 10.0.203.158 | 10.0.203.159 |
| 94 | 10.0.203.160/27 | 10.0.203.161 – 10.0.203.190 | 10.0.203.191 |
| 95 | 10.0.203.192/27 | 10.0.203.193 – 10.0.203.222 | 10.0.203.223 |
| 96 | 10.0.203.224/27 | 10.0.203.225 – 10.0.203.254 | 10.0.203.255 |
| 97 | 10.0.204.0/27 | 10.0.204.1 – 10.0.204.30 | 10.0.204.31 |
| 98 | 10.0.204.32/27 | 10.0.204.33 – 10.0.204.62 | 10.0.204.63 |
| 99 | 10.0.204.64/27 | 10.0.204.65 – 10.0.204.94 | 10.0.204.95 |
| 100 | 10.0.204.96/27 | 10.0.204.97 – 10.0.204.126 | 10.0.204.127 |
| 101 | 10.0.204.128/27 | 10.0.204.129 – 10.0.204.158 | 10.0.204.159 |
| 102 | 10.0.204.160/27 | 10.0.204.161 – 10.0.204.190 | 10.0.204.191 |
| 103 | 10.0.204.192/27 | 10.0.204.193 – 10.0.204.222 | 10.0.204.223 |
| 104 | 10.0.204.224/27 | 10.0.204.225 – 10.0.204.254 | 10.0.204.255 |
| 105 | 10.0.205.0/27 | 10.0.205.1 – 10.0.205.30 | 10.0.205.31 |
| 106 | 10.0.205.32/27 | 10.0.205.33 – 10.0.205.62 | 10.0.205.63 |
| 107 | 10.0.205.64/27 | 10.0.205.65 – 10.0.205.94 | 10.0.205.95 |
| 108 | 10.0.205.96/27 | 10.0.205.97 – 10.0.205.126 | 10.0.205.127 |
| 109 | 10.0.205.128/27 | 10.0.205.129 – 10.0.205.158 | 10.0.205.159 |
| 110 | 10.0.205.160/27 | 10.0.205.161 – 10.0.205.190 | 10.0.205.191 |
| 111 | 10.0.205.192/27 | 10.0.205.193 – 10.0.205.222 | 10.0.205.223 |
| 112 | 10.0.205.224/27 | 10.0.205.225 – 10.0.205.254 | 10.0.205.255 |
| 113 | 10.0.206.0/27 | 10.0.206.1 – 10.0.206.30 | 10.0.206.31 |
| 114 | 10.0.206.32/27 | 10.0.206.33 – 10.0.206.62 | 10.0.206.63 |
| 115 | 10.0.206.64/27 | 10.0.206.65 – 10.0.206.94 | 10.0.206.95 |
| 116 | 10.0.206.96/27 | 10.0.206.97 – 10.0.206.126 | 10.0.206.127 |
| 117 | 10.0.206.128/27 | 10.0.206.129 – 10.0.206.158 | 10.0.206.159 |
| 118 | 10.0.206.160/27 | 10.0.206.161 – 10.0.206.190 | 10.0.206.191 |
| 119 | 10.0.206.192/27 | 10.0.206.193 – 10.0.206.222 | 10.0.206.223 |
| 120 | 10.0.206.224/27 | 10.0.206.225 – 10.0.206.254 | 10.0.206.255 |
| 121 | 10.0.207.0/27 | 10.0.207.1 – 10.0.207.30 | 10.0.207.31 |
| 122 | 10.0.207.32/27 | 10.0.207.33 – 10.0.207.62 | 10.0.207.63 |
| 123 | 10.0.207.64/27 | 10.0.207.65 – 10.0.207.94 | 10.0.207.95 |
| 124 | 10.0.207.96/27 | 10.0.207.97 – 10.0.207.126 | 10.0.207.127 |
| 125 | 10.0.207.128/27 | 10.0.207.129 – 10.0.207.158 | 10.0.207.159 |
| 126 | 10.0.207.160/27 | 10.0.207.161 – 10.0.207.190 | 10.0.207.191 |
| 127 | 10.0.207.192/27 | 10.0.207.193 – 10.0.207.222 | 10.0.207.223 |
| 128 | 10.0.207.224/27 | 10.0.207.225 – 10.0.207.254 | 10.0.207.255 |
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 /20 |
|---|---|---|---|---|
| /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 | 1 |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 2 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 4 split → |
| /23 | 255.255.254.0 | 512 | 510 | 8 split → |
| /24 | 255.255.255.0 | 256 | 254 | 16 split → |
| /25 | 255.255.255.128 | 128 | 126 | 32 split → |
| /26 | 255.255.255.192 | 64 | 62 | 64 split → |
| /27 | 255.255.255.224 | 32 | 30 | 128 split → |
| /28 | 255.255.255.240 | 16 | 14 | 256 split → |
| /29 | 255.255.255.248 | 8 | 6 | 512 split → |
| /30 | 255.255.255.252 | 4 | 2 | 1,024 split → |
| /31 | 255.255.255.254 | 2 | 2 | 2,048 split → |
| /32 | 255.255.255.255 | 1 | 1 | 4,096 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.