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)10.20.0.0/15
network10.20.0.0/15
broadcast10.21.255.255
first host10.20.0.1
last host10.21.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.20.0.0/15
address00001010.00010100.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.00010100.00000000.00000000
broadcast00001010.00010101.11111111.11111111
green = network part, grey = host part
hex0x0a140000
decimal169082880
reverse dns0.0.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:0
/15 split into /23 · 256 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.20.0.0/23 | 10.20.0.1 – 10.20.1.254 | 10.20.1.255 |
| 2 | 10.20.2.0/23 | 10.20.2.1 – 10.20.3.254 | 10.20.3.255 |
| 3 | 10.20.4.0/23 | 10.20.4.1 – 10.20.5.254 | 10.20.5.255 |
| 4 | 10.20.6.0/23 | 10.20.6.1 – 10.20.7.254 | 10.20.7.255 |
| 5 | 10.20.8.0/23 | 10.20.8.1 – 10.20.9.254 | 10.20.9.255 |
| 6 | 10.20.10.0/23 | 10.20.10.1 – 10.20.11.254 | 10.20.11.255 |
| 7 | 10.20.12.0/23 | 10.20.12.1 – 10.20.13.254 | 10.20.13.255 |
| 8 | 10.20.14.0/23 | 10.20.14.1 – 10.20.15.254 | 10.20.15.255 |
| 9 | 10.20.16.0/23 | 10.20.16.1 – 10.20.17.254 | 10.20.17.255 |
| 10 | 10.20.18.0/23 | 10.20.18.1 – 10.20.19.254 | 10.20.19.255 |
| 11 | 10.20.20.0/23 | 10.20.20.1 – 10.20.21.254 | 10.20.21.255 |
| 12 | 10.20.22.0/23 | 10.20.22.1 – 10.20.23.254 | 10.20.23.255 |
| 13 | 10.20.24.0/23 | 10.20.24.1 – 10.20.25.254 | 10.20.25.255 |
| 14 | 10.20.26.0/23 | 10.20.26.1 – 10.20.27.254 | 10.20.27.255 |
| 15 | 10.20.28.0/23 | 10.20.28.1 – 10.20.29.254 | 10.20.29.255 |
| 16 | 10.20.30.0/23 | 10.20.30.1 – 10.20.31.254 | 10.20.31.255 |
| 17 | 10.20.32.0/23 | 10.20.32.1 – 10.20.33.254 | 10.20.33.255 |
| 18 | 10.20.34.0/23 | 10.20.34.1 – 10.20.35.254 | 10.20.35.255 |
| 19 | 10.20.36.0/23 | 10.20.36.1 – 10.20.37.254 | 10.20.37.255 |
| 20 | 10.20.38.0/23 | 10.20.38.1 – 10.20.39.254 | 10.20.39.255 |
| 21 | 10.20.40.0/23 | 10.20.40.1 – 10.20.41.254 | 10.20.41.255 |
| 22 | 10.20.42.0/23 | 10.20.42.1 – 10.20.43.254 | 10.20.43.255 |
| 23 | 10.20.44.0/23 | 10.20.44.1 – 10.20.45.254 | 10.20.45.255 |
| 24 | 10.20.46.0/23 | 10.20.46.1 – 10.20.47.254 | 10.20.47.255 |
| 25 | 10.20.48.0/23 | 10.20.48.1 – 10.20.49.254 | 10.20.49.255 |
| 26 | 10.20.50.0/23 | 10.20.50.1 – 10.20.51.254 | 10.20.51.255 |
| 27 | 10.20.52.0/23 | 10.20.52.1 – 10.20.53.254 | 10.20.53.255 |
| 28 | 10.20.54.0/23 | 10.20.54.1 – 10.20.55.254 | 10.20.55.255 |
| 29 | 10.20.56.0/23 | 10.20.56.1 – 10.20.57.254 | 10.20.57.255 |
| 30 | 10.20.58.0/23 | 10.20.58.1 – 10.20.59.254 | 10.20.59.255 |
| 31 | 10.20.60.0/23 | 10.20.60.1 – 10.20.61.254 | 10.20.61.255 |
| 32 | 10.20.62.0/23 | 10.20.62.1 – 10.20.63.254 | 10.20.63.255 |
| 33 | 10.20.64.0/23 | 10.20.64.1 – 10.20.65.254 | 10.20.65.255 |
| 34 | 10.20.66.0/23 | 10.20.66.1 – 10.20.67.254 | 10.20.67.255 |
| 35 | 10.20.68.0/23 | 10.20.68.1 – 10.20.69.254 | 10.20.69.255 |
| 36 | 10.20.70.0/23 | 10.20.70.1 – 10.20.71.254 | 10.20.71.255 |
| 37 | 10.20.72.0/23 | 10.20.72.1 – 10.20.73.254 | 10.20.73.255 |
| 38 | 10.20.74.0/23 | 10.20.74.1 – 10.20.75.254 | 10.20.75.255 |
| 39 | 10.20.76.0/23 | 10.20.76.1 – 10.20.77.254 | 10.20.77.255 |
| 40 | 10.20.78.0/23 | 10.20.78.1 – 10.20.79.254 | 10.20.79.255 |
| 41 | 10.20.80.0/23 | 10.20.80.1 – 10.20.81.254 | 10.20.81.255 |
| 42 | 10.20.82.0/23 | 10.20.82.1 – 10.20.83.254 | 10.20.83.255 |
| 43 | 10.20.84.0/23 | 10.20.84.1 – 10.20.85.254 | 10.20.85.255 |
| 44 | 10.20.86.0/23 | 10.20.86.1 – 10.20.87.254 | 10.20.87.255 |
| 45 | 10.20.88.0/23 | 10.20.88.1 – 10.20.89.254 | 10.20.89.255 |
| 46 | 10.20.90.0/23 | 10.20.90.1 – 10.20.91.254 | 10.20.91.255 |
| 47 | 10.20.92.0/23 | 10.20.92.1 – 10.20.93.254 | 10.20.93.255 |
| 48 | 10.20.94.0/23 | 10.20.94.1 – 10.20.95.254 | 10.20.95.255 |
| 49 | 10.20.96.0/23 | 10.20.96.1 – 10.20.97.254 | 10.20.97.255 |
| 50 | 10.20.98.0/23 | 10.20.98.1 – 10.20.99.254 | 10.20.99.255 |
| 51 | 10.20.100.0/23 | 10.20.100.1 – 10.20.101.254 | 10.20.101.255 |
| 52 | 10.20.102.0/23 | 10.20.102.1 – 10.20.103.254 | 10.20.103.255 |
| 53 | 10.20.104.0/23 | 10.20.104.1 – 10.20.105.254 | 10.20.105.255 |
| 54 | 10.20.106.0/23 | 10.20.106.1 – 10.20.107.254 | 10.20.107.255 |
| 55 | 10.20.108.0/23 | 10.20.108.1 – 10.20.109.254 | 10.20.109.255 |
| 56 | 10.20.110.0/23 | 10.20.110.1 – 10.20.111.254 | 10.20.111.255 |
| 57 | 10.20.112.0/23 | 10.20.112.1 – 10.20.113.254 | 10.20.113.255 |
| 58 | 10.20.114.0/23 | 10.20.114.1 – 10.20.115.254 | 10.20.115.255 |
| 59 | 10.20.116.0/23 | 10.20.116.1 – 10.20.117.254 | 10.20.117.255 |
| 60 | 10.20.118.0/23 | 10.20.118.1 – 10.20.119.254 | 10.20.119.255 |
| 61 | 10.20.120.0/23 | 10.20.120.1 – 10.20.121.254 | 10.20.121.255 |
| 62 | 10.20.122.0/23 | 10.20.122.1 – 10.20.123.254 | 10.20.123.255 |
| 63 | 10.20.124.0/23 | 10.20.124.1 – 10.20.125.254 | 10.20.125.255 |
| 64 | 10.20.126.0/23 | 10.20.126.1 – 10.20.127.254 | 10.20.127.255 |
| 65 | 10.20.128.0/23 | 10.20.128.1 – 10.20.129.254 | 10.20.129.255 |
| 66 | 10.20.130.0/23 | 10.20.130.1 – 10.20.131.254 | 10.20.131.255 |
| 67 | 10.20.132.0/23 | 10.20.132.1 – 10.20.133.254 | 10.20.133.255 |
| 68 | 10.20.134.0/23 | 10.20.134.1 – 10.20.135.254 | 10.20.135.255 |
| 69 | 10.20.136.0/23 | 10.20.136.1 – 10.20.137.254 | 10.20.137.255 |
| 70 | 10.20.138.0/23 | 10.20.138.1 – 10.20.139.254 | 10.20.139.255 |
| 71 | 10.20.140.0/23 | 10.20.140.1 – 10.20.141.254 | 10.20.141.255 |
| 72 | 10.20.142.0/23 | 10.20.142.1 – 10.20.143.254 | 10.20.143.255 |
| 73 | 10.20.144.0/23 | 10.20.144.1 – 10.20.145.254 | 10.20.145.255 |
| 74 | 10.20.146.0/23 | 10.20.146.1 – 10.20.147.254 | 10.20.147.255 |
| 75 | 10.20.148.0/23 | 10.20.148.1 – 10.20.149.254 | 10.20.149.255 |
| 76 | 10.20.150.0/23 | 10.20.150.1 – 10.20.151.254 | 10.20.151.255 |
| 77 | 10.20.152.0/23 | 10.20.152.1 – 10.20.153.254 | 10.20.153.255 |
| 78 | 10.20.154.0/23 | 10.20.154.1 – 10.20.155.254 | 10.20.155.255 |
| 79 | 10.20.156.0/23 | 10.20.156.1 – 10.20.157.254 | 10.20.157.255 |
| 80 | 10.20.158.0/23 | 10.20.158.1 – 10.20.159.254 | 10.20.159.255 |
| 81 | 10.20.160.0/23 | 10.20.160.1 – 10.20.161.254 | 10.20.161.255 |
| 82 | 10.20.162.0/23 | 10.20.162.1 – 10.20.163.254 | 10.20.163.255 |
| 83 | 10.20.164.0/23 | 10.20.164.1 – 10.20.165.254 | 10.20.165.255 |
| 84 | 10.20.166.0/23 | 10.20.166.1 – 10.20.167.254 | 10.20.167.255 |
| 85 | 10.20.168.0/23 | 10.20.168.1 – 10.20.169.254 | 10.20.169.255 |
| 86 | 10.20.170.0/23 | 10.20.170.1 – 10.20.171.254 | 10.20.171.255 |
| 87 | 10.20.172.0/23 | 10.20.172.1 – 10.20.173.254 | 10.20.173.255 |
| 88 | 10.20.174.0/23 | 10.20.174.1 – 10.20.175.254 | 10.20.175.255 |
| 89 | 10.20.176.0/23 | 10.20.176.1 – 10.20.177.254 | 10.20.177.255 |
| 90 | 10.20.178.0/23 | 10.20.178.1 – 10.20.179.254 | 10.20.179.255 |
| 91 | 10.20.180.0/23 | 10.20.180.1 – 10.20.181.254 | 10.20.181.255 |
| 92 | 10.20.182.0/23 | 10.20.182.1 – 10.20.183.254 | 10.20.183.255 |
| 93 | 10.20.184.0/23 | 10.20.184.1 – 10.20.185.254 | 10.20.185.255 |
| 94 | 10.20.186.0/23 | 10.20.186.1 – 10.20.187.254 | 10.20.187.255 |
| 95 | 10.20.188.0/23 | 10.20.188.1 – 10.20.189.254 | 10.20.189.255 |
| 96 | 10.20.190.0/23 | 10.20.190.1 – 10.20.191.254 | 10.20.191.255 |
| 97 | 10.20.192.0/23 | 10.20.192.1 – 10.20.193.254 | 10.20.193.255 |
| 98 | 10.20.194.0/23 | 10.20.194.1 – 10.20.195.254 | 10.20.195.255 |
| 99 | 10.20.196.0/23 | 10.20.196.1 – 10.20.197.254 | 10.20.197.255 |
| 100 | 10.20.198.0/23 | 10.20.198.1 – 10.20.199.254 | 10.20.199.255 |
| 101 | 10.20.200.0/23 | 10.20.200.1 – 10.20.201.254 | 10.20.201.255 |
| 102 | 10.20.202.0/23 | 10.20.202.1 – 10.20.203.254 | 10.20.203.255 |
| 103 | 10.20.204.0/23 | 10.20.204.1 – 10.20.205.254 | 10.20.205.255 |
| 104 | 10.20.206.0/23 | 10.20.206.1 – 10.20.207.254 | 10.20.207.255 |
| 105 | 10.20.208.0/23 | 10.20.208.1 – 10.20.209.254 | 10.20.209.255 |
| 106 | 10.20.210.0/23 | 10.20.210.1 – 10.20.211.254 | 10.20.211.255 |
| 107 | 10.20.212.0/23 | 10.20.212.1 – 10.20.213.254 | 10.20.213.255 |
| 108 | 10.20.214.0/23 | 10.20.214.1 – 10.20.215.254 | 10.20.215.255 |
| 109 | 10.20.216.0/23 | 10.20.216.1 – 10.20.217.254 | 10.20.217.255 |
| 110 | 10.20.218.0/23 | 10.20.218.1 – 10.20.219.254 | 10.20.219.255 |
| 111 | 10.20.220.0/23 | 10.20.220.1 – 10.20.221.254 | 10.20.221.255 |
| 112 | 10.20.222.0/23 | 10.20.222.1 – 10.20.223.254 | 10.20.223.255 |
| 113 | 10.20.224.0/23 | 10.20.224.1 – 10.20.225.254 | 10.20.225.255 |
| 114 | 10.20.226.0/23 | 10.20.226.1 – 10.20.227.254 | 10.20.227.255 |
| 115 | 10.20.228.0/23 | 10.20.228.1 – 10.20.229.254 | 10.20.229.255 |
| 116 | 10.20.230.0/23 | 10.20.230.1 – 10.20.231.254 | 10.20.231.255 |
| 117 | 10.20.232.0/23 | 10.20.232.1 – 10.20.233.254 | 10.20.233.255 |
| 118 | 10.20.234.0/23 | 10.20.234.1 – 10.20.235.254 | 10.20.235.255 |
| 119 | 10.20.236.0/23 | 10.20.236.1 – 10.20.237.254 | 10.20.237.255 |
| 120 | 10.20.238.0/23 | 10.20.238.1 – 10.20.239.254 | 10.20.239.255 |
| 121 | 10.20.240.0/23 | 10.20.240.1 – 10.20.241.254 | 10.20.241.255 |
| 122 | 10.20.242.0/23 | 10.20.242.1 – 10.20.243.254 | 10.20.243.255 |
| 123 | 10.20.244.0/23 | 10.20.244.1 – 10.20.245.254 | 10.20.245.255 |
| 124 | 10.20.246.0/23 | 10.20.246.1 – 10.20.247.254 | 10.20.247.255 |
| 125 | 10.20.248.0/23 | 10.20.248.1 – 10.20.249.254 | 10.20.249.255 |
| 126 | 10.20.250.0/23 | 10.20.250.1 – 10.20.251.254 | 10.20.251.255 |
| 127 | 10.20.252.0/23 | 10.20.252.1 – 10.20.253.254 | 10.20.253.255 |
| 128 | 10.20.254.0/23 | 10.20.254.1 – 10.20.255.254 | 10.20.255.255 |
| 129 | 10.21.0.0/23 | 10.21.0.1 – 10.21.1.254 | 10.21.1.255 |
| 130 | 10.21.2.0/23 | 10.21.2.1 – 10.21.3.254 | 10.21.3.255 |
| 131 | 10.21.4.0/23 | 10.21.4.1 – 10.21.5.254 | 10.21.5.255 |
| 132 | 10.21.6.0/23 | 10.21.6.1 – 10.21.7.254 | 10.21.7.255 |
| 133 | 10.21.8.0/23 | 10.21.8.1 – 10.21.9.254 | 10.21.9.255 |
| 134 | 10.21.10.0/23 | 10.21.10.1 – 10.21.11.254 | 10.21.11.255 |
| 135 | 10.21.12.0/23 | 10.21.12.1 – 10.21.13.254 | 10.21.13.255 |
| 136 | 10.21.14.0/23 | 10.21.14.1 – 10.21.15.254 | 10.21.15.255 |
| 137 | 10.21.16.0/23 | 10.21.16.1 – 10.21.17.254 | 10.21.17.255 |
| 138 | 10.21.18.0/23 | 10.21.18.1 – 10.21.19.254 | 10.21.19.255 |
| 139 | 10.21.20.0/23 | 10.21.20.1 – 10.21.21.254 | 10.21.21.255 |
| 140 | 10.21.22.0/23 | 10.21.22.1 – 10.21.23.254 | 10.21.23.255 |
| 141 | 10.21.24.0/23 | 10.21.24.1 – 10.21.25.254 | 10.21.25.255 |
| 142 | 10.21.26.0/23 | 10.21.26.1 – 10.21.27.254 | 10.21.27.255 |
| 143 | 10.21.28.0/23 | 10.21.28.1 – 10.21.29.254 | 10.21.29.255 |
| 144 | 10.21.30.0/23 | 10.21.30.1 – 10.21.31.254 | 10.21.31.255 |
| 145 | 10.21.32.0/23 | 10.21.32.1 – 10.21.33.254 | 10.21.33.255 |
| 146 | 10.21.34.0/23 | 10.21.34.1 – 10.21.35.254 | 10.21.35.255 |
| 147 | 10.21.36.0/23 | 10.21.36.1 – 10.21.37.254 | 10.21.37.255 |
| 148 | 10.21.38.0/23 | 10.21.38.1 – 10.21.39.254 | 10.21.39.255 |
| 149 | 10.21.40.0/23 | 10.21.40.1 – 10.21.41.254 | 10.21.41.255 |
| 150 | 10.21.42.0/23 | 10.21.42.1 – 10.21.43.254 | 10.21.43.255 |
| 151 | 10.21.44.0/23 | 10.21.44.1 – 10.21.45.254 | 10.21.45.255 |
| 152 | 10.21.46.0/23 | 10.21.46.1 – 10.21.47.254 | 10.21.47.255 |
| 153 | 10.21.48.0/23 | 10.21.48.1 – 10.21.49.254 | 10.21.49.255 |
| 154 | 10.21.50.0/23 | 10.21.50.1 – 10.21.51.254 | 10.21.51.255 |
| 155 | 10.21.52.0/23 | 10.21.52.1 – 10.21.53.254 | 10.21.53.255 |
| 156 | 10.21.54.0/23 | 10.21.54.1 – 10.21.55.254 | 10.21.55.255 |
| 157 | 10.21.56.0/23 | 10.21.56.1 – 10.21.57.254 | 10.21.57.255 |
| 158 | 10.21.58.0/23 | 10.21.58.1 – 10.21.59.254 | 10.21.59.255 |
| 159 | 10.21.60.0/23 | 10.21.60.1 – 10.21.61.254 | 10.21.61.255 |
| 160 | 10.21.62.0/23 | 10.21.62.1 – 10.21.63.254 | 10.21.63.255 |
| 161 | 10.21.64.0/23 | 10.21.64.1 – 10.21.65.254 | 10.21.65.255 |
| 162 | 10.21.66.0/23 | 10.21.66.1 – 10.21.67.254 | 10.21.67.255 |
| 163 | 10.21.68.0/23 | 10.21.68.1 – 10.21.69.254 | 10.21.69.255 |
| 164 | 10.21.70.0/23 | 10.21.70.1 – 10.21.71.254 | 10.21.71.255 |
| 165 | 10.21.72.0/23 | 10.21.72.1 – 10.21.73.254 | 10.21.73.255 |
| 166 | 10.21.74.0/23 | 10.21.74.1 – 10.21.75.254 | 10.21.75.255 |
| 167 | 10.21.76.0/23 | 10.21.76.1 – 10.21.77.254 | 10.21.77.255 |
| 168 | 10.21.78.0/23 | 10.21.78.1 – 10.21.79.254 | 10.21.79.255 |
| 169 | 10.21.80.0/23 | 10.21.80.1 – 10.21.81.254 | 10.21.81.255 |
| 170 | 10.21.82.0/23 | 10.21.82.1 – 10.21.83.254 | 10.21.83.255 |
| 171 | 10.21.84.0/23 | 10.21.84.1 – 10.21.85.254 | 10.21.85.255 |
| 172 | 10.21.86.0/23 | 10.21.86.1 – 10.21.87.254 | 10.21.87.255 |
| 173 | 10.21.88.0/23 | 10.21.88.1 – 10.21.89.254 | 10.21.89.255 |
| 174 | 10.21.90.0/23 | 10.21.90.1 – 10.21.91.254 | 10.21.91.255 |
| 175 | 10.21.92.0/23 | 10.21.92.1 – 10.21.93.254 | 10.21.93.255 |
| 176 | 10.21.94.0/23 | 10.21.94.1 – 10.21.95.254 | 10.21.95.255 |
| 177 | 10.21.96.0/23 | 10.21.96.1 – 10.21.97.254 | 10.21.97.255 |
| 178 | 10.21.98.0/23 | 10.21.98.1 – 10.21.99.254 | 10.21.99.255 |
| 179 | 10.21.100.0/23 | 10.21.100.1 – 10.21.101.254 | 10.21.101.255 |
| 180 | 10.21.102.0/23 | 10.21.102.1 – 10.21.103.254 | 10.21.103.255 |
| 181 | 10.21.104.0/23 | 10.21.104.1 – 10.21.105.254 | 10.21.105.255 |
| 182 | 10.21.106.0/23 | 10.21.106.1 – 10.21.107.254 | 10.21.107.255 |
| 183 | 10.21.108.0/23 | 10.21.108.1 – 10.21.109.254 | 10.21.109.255 |
| 184 | 10.21.110.0/23 | 10.21.110.1 – 10.21.111.254 | 10.21.111.255 |
| 185 | 10.21.112.0/23 | 10.21.112.1 – 10.21.113.254 | 10.21.113.255 |
| 186 | 10.21.114.0/23 | 10.21.114.1 – 10.21.115.254 | 10.21.115.255 |
| 187 | 10.21.116.0/23 | 10.21.116.1 – 10.21.117.254 | 10.21.117.255 |
| 188 | 10.21.118.0/23 | 10.21.118.1 – 10.21.119.254 | 10.21.119.255 |
| 189 | 10.21.120.0/23 | 10.21.120.1 – 10.21.121.254 | 10.21.121.255 |
| 190 | 10.21.122.0/23 | 10.21.122.1 – 10.21.123.254 | 10.21.123.255 |
| 191 | 10.21.124.0/23 | 10.21.124.1 – 10.21.125.254 | 10.21.125.255 |
| 192 | 10.21.126.0/23 | 10.21.126.1 – 10.21.127.254 | 10.21.127.255 |
| 193 | 10.21.128.0/23 | 10.21.128.1 – 10.21.129.254 | 10.21.129.255 |
| 194 | 10.21.130.0/23 | 10.21.130.1 – 10.21.131.254 | 10.21.131.255 |
| 195 | 10.21.132.0/23 | 10.21.132.1 – 10.21.133.254 | 10.21.133.255 |
| 196 | 10.21.134.0/23 | 10.21.134.1 – 10.21.135.254 | 10.21.135.255 |
| 197 | 10.21.136.0/23 | 10.21.136.1 – 10.21.137.254 | 10.21.137.255 |
| 198 | 10.21.138.0/23 | 10.21.138.1 – 10.21.139.254 | 10.21.139.255 |
| 199 | 10.21.140.0/23 | 10.21.140.1 – 10.21.141.254 | 10.21.141.255 |
| 200 | 10.21.142.0/23 | 10.21.142.1 – 10.21.143.254 | 10.21.143.255 |
| 201 | 10.21.144.0/23 | 10.21.144.1 – 10.21.145.254 | 10.21.145.255 |
| 202 | 10.21.146.0/23 | 10.21.146.1 – 10.21.147.254 | 10.21.147.255 |
| 203 | 10.21.148.0/23 | 10.21.148.1 – 10.21.149.254 | 10.21.149.255 |
| 204 | 10.21.150.0/23 | 10.21.150.1 – 10.21.151.254 | 10.21.151.255 |
| 205 | 10.21.152.0/23 | 10.21.152.1 – 10.21.153.254 | 10.21.153.255 |
| 206 | 10.21.154.0/23 | 10.21.154.1 – 10.21.155.254 | 10.21.155.255 |
| 207 | 10.21.156.0/23 | 10.21.156.1 – 10.21.157.254 | 10.21.157.255 |
| 208 | 10.21.158.0/23 | 10.21.158.1 – 10.21.159.254 | 10.21.159.255 |
| 209 | 10.21.160.0/23 | 10.21.160.1 – 10.21.161.254 | 10.21.161.255 |
| 210 | 10.21.162.0/23 | 10.21.162.1 – 10.21.163.254 | 10.21.163.255 |
| 211 | 10.21.164.0/23 | 10.21.164.1 – 10.21.165.254 | 10.21.165.255 |
| 212 | 10.21.166.0/23 | 10.21.166.1 – 10.21.167.254 | 10.21.167.255 |
| 213 | 10.21.168.0/23 | 10.21.168.1 – 10.21.169.254 | 10.21.169.255 |
| 214 | 10.21.170.0/23 | 10.21.170.1 – 10.21.171.254 | 10.21.171.255 |
| 215 | 10.21.172.0/23 | 10.21.172.1 – 10.21.173.254 | 10.21.173.255 |
| 216 | 10.21.174.0/23 | 10.21.174.1 – 10.21.175.254 | 10.21.175.255 |
| 217 | 10.21.176.0/23 | 10.21.176.1 – 10.21.177.254 | 10.21.177.255 |
| 218 | 10.21.178.0/23 | 10.21.178.1 – 10.21.179.254 | 10.21.179.255 |
| 219 | 10.21.180.0/23 | 10.21.180.1 – 10.21.181.254 | 10.21.181.255 |
| 220 | 10.21.182.0/23 | 10.21.182.1 – 10.21.183.254 | 10.21.183.255 |
| 221 | 10.21.184.0/23 | 10.21.184.1 – 10.21.185.254 | 10.21.185.255 |
| 222 | 10.21.186.0/23 | 10.21.186.1 – 10.21.187.254 | 10.21.187.255 |
| 223 | 10.21.188.0/23 | 10.21.188.1 – 10.21.189.254 | 10.21.189.255 |
| 224 | 10.21.190.0/23 | 10.21.190.1 – 10.21.191.254 | 10.21.191.255 |
| 225 | 10.21.192.0/23 | 10.21.192.1 – 10.21.193.254 | 10.21.193.255 |
| 226 | 10.21.194.0/23 | 10.21.194.1 – 10.21.195.254 | 10.21.195.255 |
| 227 | 10.21.196.0/23 | 10.21.196.1 – 10.21.197.254 | 10.21.197.255 |
| 228 | 10.21.198.0/23 | 10.21.198.1 – 10.21.199.254 | 10.21.199.255 |
| 229 | 10.21.200.0/23 | 10.21.200.1 – 10.21.201.254 | 10.21.201.255 |
| 230 | 10.21.202.0/23 | 10.21.202.1 – 10.21.203.254 | 10.21.203.255 |
| 231 | 10.21.204.0/23 | 10.21.204.1 – 10.21.205.254 | 10.21.205.255 |
| 232 | 10.21.206.0/23 | 10.21.206.1 – 10.21.207.254 | 10.21.207.255 |
| 233 | 10.21.208.0/23 | 10.21.208.1 – 10.21.209.254 | 10.21.209.255 |
| 234 | 10.21.210.0/23 | 10.21.210.1 – 10.21.211.254 | 10.21.211.255 |
| 235 | 10.21.212.0/23 | 10.21.212.1 – 10.21.213.254 | 10.21.213.255 |
| 236 | 10.21.214.0/23 | 10.21.214.1 – 10.21.215.254 | 10.21.215.255 |
| 237 | 10.21.216.0/23 | 10.21.216.1 – 10.21.217.254 | 10.21.217.255 |
| 238 | 10.21.218.0/23 | 10.21.218.1 – 10.21.219.254 | 10.21.219.255 |
| 239 | 10.21.220.0/23 | 10.21.220.1 – 10.21.221.254 | 10.21.221.255 |
| 240 | 10.21.222.0/23 | 10.21.222.1 – 10.21.223.254 | 10.21.223.255 |
| 241 | 10.21.224.0/23 | 10.21.224.1 – 10.21.225.254 | 10.21.225.255 |
| 242 | 10.21.226.0/23 | 10.21.226.1 – 10.21.227.254 | 10.21.227.255 |
| 243 | 10.21.228.0/23 | 10.21.228.1 – 10.21.229.254 | 10.21.229.255 |
| 244 | 10.21.230.0/23 | 10.21.230.1 – 10.21.231.254 | 10.21.231.255 |
| 245 | 10.21.232.0/23 | 10.21.232.1 – 10.21.233.254 | 10.21.233.255 |
| 246 | 10.21.234.0/23 | 10.21.234.1 – 10.21.235.254 | 10.21.235.255 |
| 247 | 10.21.236.0/23 | 10.21.236.1 – 10.21.237.254 | 10.21.237.255 |
| 248 | 10.21.238.0/23 | 10.21.238.1 – 10.21.239.254 | 10.21.239.255 |
| 249 | 10.21.240.0/23 | 10.21.240.1 – 10.21.241.254 | 10.21.241.255 |
| 250 | 10.21.242.0/23 | 10.21.242.1 – 10.21.243.254 | 10.21.243.255 |
| 251 | 10.21.244.0/23 | 10.21.244.1 – 10.21.245.254 | 10.21.245.255 |
| 252 | 10.21.246.0/23 | 10.21.246.1 – 10.21.247.254 | 10.21.247.255 |
| 253 | 10.21.248.0/23 | 10.21.248.1 – 10.21.249.254 | 10.21.249.255 |
| 254 | 10.21.250.0/23 | 10.21.250.1 – 10.21.251.254 | 10.21.251.255 |
| 255 | 10.21.252.0/23 | 10.21.252.1 – 10.21.253.254 | 10.21.253.255 |
| 256 | 10.21.254.0/23 | 10.21.254.1 – 10.21.255.254 | 10.21.255.255 |
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 /15 |
|---|---|---|---|---|
| /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 | 1 |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 2 split → |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 4 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 8 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 16 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 32 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 64 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 128 split → |
| /23 | 255.255.254.0 | 512 | 510 | 256 split → |
| /24 | 255.255.255.0 | 256 | 254 | 512 split → |
| /25 | 255.255.255.128 | 128 | 126 | 1,024 split → |
| /26 | 255.255.255.192 | 64 | 62 | 2,048 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4,096 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8,192 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16,384 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32,768 split → |
| /31 | 255.255.255.254 | 2 | 2 | 65,536 split → |
| /32 | 255.255.255.255 | 1 | 1 | 131,072 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.