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)10.128.0.0/9
network10.128.0.0/9
broadcast10.255.255.255
first host10.128.0.1
last host10.255.255.254
subnet mask255.128.0.0
wildcard0.127.255.255
addresses8,388,608
usable hosts8,388,606
classA
ipcalc 10.128.0.0/9
address00001010.10000000.00000000.00000000
subnet mask11111111.10000000.00000000.00000000
network00001010.10000000.00000000.00000000
broadcast00001010.11111111.11111111.11111111
green = network part, grey = host part
hex0x0a800000
decimal176160768
reverse dns0.0.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:0
/9 split into /16 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.128.0.0/16 | 10.128.0.1 – 10.128.255.254 | 10.128.255.255 |
| 2 | 10.129.0.0/16 | 10.129.0.1 – 10.129.255.254 | 10.129.255.255 |
| 3 | 10.130.0.0/16 | 10.130.0.1 – 10.130.255.254 | 10.130.255.255 |
| 4 | 10.131.0.0/16 | 10.131.0.1 – 10.131.255.254 | 10.131.255.255 |
| 5 | 10.132.0.0/16 | 10.132.0.1 – 10.132.255.254 | 10.132.255.255 |
| 6 | 10.133.0.0/16 | 10.133.0.1 – 10.133.255.254 | 10.133.255.255 |
| 7 | 10.134.0.0/16 | 10.134.0.1 – 10.134.255.254 | 10.134.255.255 |
| 8 | 10.135.0.0/16 | 10.135.0.1 – 10.135.255.254 | 10.135.255.255 |
| 9 | 10.136.0.0/16 | 10.136.0.1 – 10.136.255.254 | 10.136.255.255 |
| 10 | 10.137.0.0/16 | 10.137.0.1 – 10.137.255.254 | 10.137.255.255 |
| 11 | 10.138.0.0/16 | 10.138.0.1 – 10.138.255.254 | 10.138.255.255 |
| 12 | 10.139.0.0/16 | 10.139.0.1 – 10.139.255.254 | 10.139.255.255 |
| 13 | 10.140.0.0/16 | 10.140.0.1 – 10.140.255.254 | 10.140.255.255 |
| 14 | 10.141.0.0/16 | 10.141.0.1 – 10.141.255.254 | 10.141.255.255 |
| 15 | 10.142.0.0/16 | 10.142.0.1 – 10.142.255.254 | 10.142.255.255 |
| 16 | 10.143.0.0/16 | 10.143.0.1 – 10.143.255.254 | 10.143.255.255 |
| 17 | 10.144.0.0/16 | 10.144.0.1 – 10.144.255.254 | 10.144.255.255 |
| 18 | 10.145.0.0/16 | 10.145.0.1 – 10.145.255.254 | 10.145.255.255 |
| 19 | 10.146.0.0/16 | 10.146.0.1 – 10.146.255.254 | 10.146.255.255 |
| 20 | 10.147.0.0/16 | 10.147.0.1 – 10.147.255.254 | 10.147.255.255 |
| 21 | 10.148.0.0/16 | 10.148.0.1 – 10.148.255.254 | 10.148.255.255 |
| 22 | 10.149.0.0/16 | 10.149.0.1 – 10.149.255.254 | 10.149.255.255 |
| 23 | 10.150.0.0/16 | 10.150.0.1 – 10.150.255.254 | 10.150.255.255 |
| 24 | 10.151.0.0/16 | 10.151.0.1 – 10.151.255.254 | 10.151.255.255 |
| 25 | 10.152.0.0/16 | 10.152.0.1 – 10.152.255.254 | 10.152.255.255 |
| 26 | 10.153.0.0/16 | 10.153.0.1 – 10.153.255.254 | 10.153.255.255 |
| 27 | 10.154.0.0/16 | 10.154.0.1 – 10.154.255.254 | 10.154.255.255 |
| 28 | 10.155.0.0/16 | 10.155.0.1 – 10.155.255.254 | 10.155.255.255 |
| 29 | 10.156.0.0/16 | 10.156.0.1 – 10.156.255.254 | 10.156.255.255 |
| 30 | 10.157.0.0/16 | 10.157.0.1 – 10.157.255.254 | 10.157.255.255 |
| 31 | 10.158.0.0/16 | 10.158.0.1 – 10.158.255.254 | 10.158.255.255 |
| 32 | 10.159.0.0/16 | 10.159.0.1 – 10.159.255.254 | 10.159.255.255 |
| 33 | 10.160.0.0/16 | 10.160.0.1 – 10.160.255.254 | 10.160.255.255 |
| 34 | 10.161.0.0/16 | 10.161.0.1 – 10.161.255.254 | 10.161.255.255 |
| 35 | 10.162.0.0/16 | 10.162.0.1 – 10.162.255.254 | 10.162.255.255 |
| 36 | 10.163.0.0/16 | 10.163.0.1 – 10.163.255.254 | 10.163.255.255 |
| 37 | 10.164.0.0/16 | 10.164.0.1 – 10.164.255.254 | 10.164.255.255 |
| 38 | 10.165.0.0/16 | 10.165.0.1 – 10.165.255.254 | 10.165.255.255 |
| 39 | 10.166.0.0/16 | 10.166.0.1 – 10.166.255.254 | 10.166.255.255 |
| 40 | 10.167.0.0/16 | 10.167.0.1 – 10.167.255.254 | 10.167.255.255 |
| 41 | 10.168.0.0/16 | 10.168.0.1 – 10.168.255.254 | 10.168.255.255 |
| 42 | 10.169.0.0/16 | 10.169.0.1 – 10.169.255.254 | 10.169.255.255 |
| 43 | 10.170.0.0/16 | 10.170.0.1 – 10.170.255.254 | 10.170.255.255 |
| 44 | 10.171.0.0/16 | 10.171.0.1 – 10.171.255.254 | 10.171.255.255 |
| 45 | 10.172.0.0/16 | 10.172.0.1 – 10.172.255.254 | 10.172.255.255 |
| 46 | 10.173.0.0/16 | 10.173.0.1 – 10.173.255.254 | 10.173.255.255 |
| 47 | 10.174.0.0/16 | 10.174.0.1 – 10.174.255.254 | 10.174.255.255 |
| 48 | 10.175.0.0/16 | 10.175.0.1 – 10.175.255.254 | 10.175.255.255 |
| 49 | 10.176.0.0/16 | 10.176.0.1 – 10.176.255.254 | 10.176.255.255 |
| 50 | 10.177.0.0/16 | 10.177.0.1 – 10.177.255.254 | 10.177.255.255 |
| 51 | 10.178.0.0/16 | 10.178.0.1 – 10.178.255.254 | 10.178.255.255 |
| 52 | 10.179.0.0/16 | 10.179.0.1 – 10.179.255.254 | 10.179.255.255 |
| 53 | 10.180.0.0/16 | 10.180.0.1 – 10.180.255.254 | 10.180.255.255 |
| 54 | 10.181.0.0/16 | 10.181.0.1 – 10.181.255.254 | 10.181.255.255 |
| 55 | 10.182.0.0/16 | 10.182.0.1 – 10.182.255.254 | 10.182.255.255 |
| 56 | 10.183.0.0/16 | 10.183.0.1 – 10.183.255.254 | 10.183.255.255 |
| 57 | 10.184.0.0/16 | 10.184.0.1 – 10.184.255.254 | 10.184.255.255 |
| 58 | 10.185.0.0/16 | 10.185.0.1 – 10.185.255.254 | 10.185.255.255 |
| 59 | 10.186.0.0/16 | 10.186.0.1 – 10.186.255.254 | 10.186.255.255 |
| 60 | 10.187.0.0/16 | 10.187.0.1 – 10.187.255.254 | 10.187.255.255 |
| 61 | 10.188.0.0/16 | 10.188.0.1 – 10.188.255.254 | 10.188.255.255 |
| 62 | 10.189.0.0/16 | 10.189.0.1 – 10.189.255.254 | 10.189.255.255 |
| 63 | 10.190.0.0/16 | 10.190.0.1 – 10.190.255.254 | 10.190.255.255 |
| 64 | 10.191.0.0/16 | 10.191.0.1 – 10.191.255.254 | 10.191.255.255 |
| 65 | 10.192.0.0/16 | 10.192.0.1 – 10.192.255.254 | 10.192.255.255 |
| 66 | 10.193.0.0/16 | 10.193.0.1 – 10.193.255.254 | 10.193.255.255 |
| 67 | 10.194.0.0/16 | 10.194.0.1 – 10.194.255.254 | 10.194.255.255 |
| 68 | 10.195.0.0/16 | 10.195.0.1 – 10.195.255.254 | 10.195.255.255 |
| 69 | 10.196.0.0/16 | 10.196.0.1 – 10.196.255.254 | 10.196.255.255 |
| 70 | 10.197.0.0/16 | 10.197.0.1 – 10.197.255.254 | 10.197.255.255 |
| 71 | 10.198.0.0/16 | 10.198.0.1 – 10.198.255.254 | 10.198.255.255 |
| 72 | 10.199.0.0/16 | 10.199.0.1 – 10.199.255.254 | 10.199.255.255 |
| 73 | 10.200.0.0/16 | 10.200.0.1 – 10.200.255.254 | 10.200.255.255 |
| 74 | 10.201.0.0/16 | 10.201.0.1 – 10.201.255.254 | 10.201.255.255 |
| 75 | 10.202.0.0/16 | 10.202.0.1 – 10.202.255.254 | 10.202.255.255 |
| 76 | 10.203.0.0/16 | 10.203.0.1 – 10.203.255.254 | 10.203.255.255 |
| 77 | 10.204.0.0/16 | 10.204.0.1 – 10.204.255.254 | 10.204.255.255 |
| 78 | 10.205.0.0/16 | 10.205.0.1 – 10.205.255.254 | 10.205.255.255 |
| 79 | 10.206.0.0/16 | 10.206.0.1 – 10.206.255.254 | 10.206.255.255 |
| 80 | 10.207.0.0/16 | 10.207.0.1 – 10.207.255.254 | 10.207.255.255 |
| 81 | 10.208.0.0/16 | 10.208.0.1 – 10.208.255.254 | 10.208.255.255 |
| 82 | 10.209.0.0/16 | 10.209.0.1 – 10.209.255.254 | 10.209.255.255 |
| 83 | 10.210.0.0/16 | 10.210.0.1 – 10.210.255.254 | 10.210.255.255 |
| 84 | 10.211.0.0/16 | 10.211.0.1 – 10.211.255.254 | 10.211.255.255 |
| 85 | 10.212.0.0/16 | 10.212.0.1 – 10.212.255.254 | 10.212.255.255 |
| 86 | 10.213.0.0/16 | 10.213.0.1 – 10.213.255.254 | 10.213.255.255 |
| 87 | 10.214.0.0/16 | 10.214.0.1 – 10.214.255.254 | 10.214.255.255 |
| 88 | 10.215.0.0/16 | 10.215.0.1 – 10.215.255.254 | 10.215.255.255 |
| 89 | 10.216.0.0/16 | 10.216.0.1 – 10.216.255.254 | 10.216.255.255 |
| 90 | 10.217.0.0/16 | 10.217.0.1 – 10.217.255.254 | 10.217.255.255 |
| 91 | 10.218.0.0/16 | 10.218.0.1 – 10.218.255.254 | 10.218.255.255 |
| 92 | 10.219.0.0/16 | 10.219.0.1 – 10.219.255.254 | 10.219.255.255 |
| 93 | 10.220.0.0/16 | 10.220.0.1 – 10.220.255.254 | 10.220.255.255 |
| 94 | 10.221.0.0/16 | 10.221.0.1 – 10.221.255.254 | 10.221.255.255 |
| 95 | 10.222.0.0/16 | 10.222.0.1 – 10.222.255.254 | 10.222.255.255 |
| 96 | 10.223.0.0/16 | 10.223.0.1 – 10.223.255.254 | 10.223.255.255 |
| 97 | 10.224.0.0/16 | 10.224.0.1 – 10.224.255.254 | 10.224.255.255 |
| 98 | 10.225.0.0/16 | 10.225.0.1 – 10.225.255.254 | 10.225.255.255 |
| 99 | 10.226.0.0/16 | 10.226.0.1 – 10.226.255.254 | 10.226.255.255 |
| 100 | 10.227.0.0/16 | 10.227.0.1 – 10.227.255.254 | 10.227.255.255 |
| 101 | 10.228.0.0/16 | 10.228.0.1 – 10.228.255.254 | 10.228.255.255 |
| 102 | 10.229.0.0/16 | 10.229.0.1 – 10.229.255.254 | 10.229.255.255 |
| 103 | 10.230.0.0/16 | 10.230.0.1 – 10.230.255.254 | 10.230.255.255 |
| 104 | 10.231.0.0/16 | 10.231.0.1 – 10.231.255.254 | 10.231.255.255 |
| 105 | 10.232.0.0/16 | 10.232.0.1 – 10.232.255.254 | 10.232.255.255 |
| 106 | 10.233.0.0/16 | 10.233.0.1 – 10.233.255.254 | 10.233.255.255 |
| 107 | 10.234.0.0/16 | 10.234.0.1 – 10.234.255.254 | 10.234.255.255 |
| 108 | 10.235.0.0/16 | 10.235.0.1 – 10.235.255.254 | 10.235.255.255 |
| 109 | 10.236.0.0/16 | 10.236.0.1 – 10.236.255.254 | 10.236.255.255 |
| 110 | 10.237.0.0/16 | 10.237.0.1 – 10.237.255.254 | 10.237.255.255 |
| 111 | 10.238.0.0/16 | 10.238.0.1 – 10.238.255.254 | 10.238.255.255 |
| 112 | 10.239.0.0/16 | 10.239.0.1 – 10.239.255.254 | 10.239.255.255 |
| 113 | 10.240.0.0/16 | 10.240.0.1 – 10.240.255.254 | 10.240.255.255 |
| 114 | 10.241.0.0/16 | 10.241.0.1 – 10.241.255.254 | 10.241.255.255 |
| 115 | 10.242.0.0/16 | 10.242.0.1 – 10.242.255.254 | 10.242.255.255 |
| 116 | 10.243.0.0/16 | 10.243.0.1 – 10.243.255.254 | 10.243.255.255 |
| 117 | 10.244.0.0/16 | 10.244.0.1 – 10.244.255.254 | 10.244.255.255 |
| 118 | 10.245.0.0/16 | 10.245.0.1 – 10.245.255.254 | 10.245.255.255 |
| 119 | 10.246.0.0/16 | 10.246.0.1 – 10.246.255.254 | 10.246.255.255 |
| 120 | 10.247.0.0/16 | 10.247.0.1 – 10.247.255.254 | 10.247.255.255 |
| 121 | 10.248.0.0/16 | 10.248.0.1 – 10.248.255.254 | 10.248.255.255 |
| 122 | 10.249.0.0/16 | 10.249.0.1 – 10.249.255.254 | 10.249.255.255 |
| 123 | 10.250.0.0/16 | 10.250.0.1 – 10.250.255.254 | 10.250.255.255 |
| 124 | 10.251.0.0/16 | 10.251.0.1 – 10.251.255.254 | 10.251.255.255 |
| 125 | 10.252.0.0/16 | 10.252.0.1 – 10.252.255.254 | 10.252.255.255 |
| 126 | 10.253.0.0/16 | 10.253.0.1 – 10.253.255.254 | 10.253.255.255 |
| 127 | 10.254.0.0/16 | 10.254.0.1 – 10.254.255.254 | 10.254.255.255 |
| 128 | 10.255.0.0/16 | 10.255.0.1 – 10.255.255.254 | 10.255.255.255 |
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 /9 |
|---|---|---|---|---|
| /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 | 1 |
| /10 | 255.192.0.0 | 4,194,304 | 4,194,302 | 2 split → |
| /11 | 255.224.0.0 | 2,097,152 | 2,097,150 | 4 split → |
| /12 | 255.240.0.0 | 1,048,576 | 1,048,574 | 8 split → |
| /13 | 255.248.0.0 | 524,288 | 524,286 | 16 split → |
| /14 | 255.252.0.0 | 262,144 | 262,142 | 32 split → |
| /15 | 255.254.0.0 | 131,072 | 131,070 | 64 split → |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 128 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 256 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 512 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 1,024 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 2,048 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 4,096 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 8,192 split → |
| /23 | 255.255.254.0 | 512 | 510 | 16,384 split → |
| /24 | 255.255.255.0 | 256 | 254 | 32,768 split → |
| /25 | 255.255.255.128 | 128 | 126 | 65,536 split → |
| /26 | 255.255.255.192 | 64 | 62 | 131,072 split → |
| /27 | 255.255.255.224 | 32 | 30 | 262,144 split → |
| /28 | 255.255.255.240 | 16 | 14 | 524,288 split → |
| /29 | 255.255.255.248 | 8 | 6 | 1,048,576 split → |
| /30 | 255.255.255.252 | 4 | 2 | 2,097,152 split → |
| /31 | 255.255.255.254 | 2 | 2 | 4,194,304 split → |
| /32 | 255.255.255.255 | 1 | 1 | 8,388,608 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.