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)10.81.0.0/16
network10.81.0.0/16
broadcast10.81.255.255
first host10.81.0.1
last host10.81.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.81.0.0/16
address00001010.01010001.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.01010001.00000000.00000000
broadcast00001010.01010001.11111111.11111111
green = network part, grey = host part
hex0x0a510000
decimal173080576
reverse dns0.0.81.10.in-addr.arpa
ipv4-mapped::ffff:a51:0
/16 split into /25 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.81.0.0/25 | 10.81.0.1 – 10.81.0.126 | 10.81.0.127 |
| 2 | 10.81.0.128/25 | 10.81.0.129 – 10.81.0.254 | 10.81.0.255 |
| 3 | 10.81.1.0/25 | 10.81.1.1 – 10.81.1.126 | 10.81.1.127 |
| 4 | 10.81.1.128/25 | 10.81.1.129 – 10.81.1.254 | 10.81.1.255 |
| 5 | 10.81.2.0/25 | 10.81.2.1 – 10.81.2.126 | 10.81.2.127 |
| 6 | 10.81.2.128/25 | 10.81.2.129 – 10.81.2.254 | 10.81.2.255 |
| 7 | 10.81.3.0/25 | 10.81.3.1 – 10.81.3.126 | 10.81.3.127 |
| 8 | 10.81.3.128/25 | 10.81.3.129 – 10.81.3.254 | 10.81.3.255 |
| 9 | 10.81.4.0/25 | 10.81.4.1 – 10.81.4.126 | 10.81.4.127 |
| 10 | 10.81.4.128/25 | 10.81.4.129 – 10.81.4.254 | 10.81.4.255 |
| 11 | 10.81.5.0/25 | 10.81.5.1 – 10.81.5.126 | 10.81.5.127 |
| 12 | 10.81.5.128/25 | 10.81.5.129 – 10.81.5.254 | 10.81.5.255 |
| 13 | 10.81.6.0/25 | 10.81.6.1 – 10.81.6.126 | 10.81.6.127 |
| 14 | 10.81.6.128/25 | 10.81.6.129 – 10.81.6.254 | 10.81.6.255 |
| 15 | 10.81.7.0/25 | 10.81.7.1 – 10.81.7.126 | 10.81.7.127 |
| 16 | 10.81.7.128/25 | 10.81.7.129 – 10.81.7.254 | 10.81.7.255 |
| 17 | 10.81.8.0/25 | 10.81.8.1 – 10.81.8.126 | 10.81.8.127 |
| 18 | 10.81.8.128/25 | 10.81.8.129 – 10.81.8.254 | 10.81.8.255 |
| 19 | 10.81.9.0/25 | 10.81.9.1 – 10.81.9.126 | 10.81.9.127 |
| 20 | 10.81.9.128/25 | 10.81.9.129 – 10.81.9.254 | 10.81.9.255 |
| 21 | 10.81.10.0/25 | 10.81.10.1 – 10.81.10.126 | 10.81.10.127 |
| 22 | 10.81.10.128/25 | 10.81.10.129 – 10.81.10.254 | 10.81.10.255 |
| 23 | 10.81.11.0/25 | 10.81.11.1 – 10.81.11.126 | 10.81.11.127 |
| 24 | 10.81.11.128/25 | 10.81.11.129 – 10.81.11.254 | 10.81.11.255 |
| 25 | 10.81.12.0/25 | 10.81.12.1 – 10.81.12.126 | 10.81.12.127 |
| 26 | 10.81.12.128/25 | 10.81.12.129 – 10.81.12.254 | 10.81.12.255 |
| 27 | 10.81.13.0/25 | 10.81.13.1 – 10.81.13.126 | 10.81.13.127 |
| 28 | 10.81.13.128/25 | 10.81.13.129 – 10.81.13.254 | 10.81.13.255 |
| 29 | 10.81.14.0/25 | 10.81.14.1 – 10.81.14.126 | 10.81.14.127 |
| 30 | 10.81.14.128/25 | 10.81.14.129 – 10.81.14.254 | 10.81.14.255 |
| 31 | 10.81.15.0/25 | 10.81.15.1 – 10.81.15.126 | 10.81.15.127 |
| 32 | 10.81.15.128/25 | 10.81.15.129 – 10.81.15.254 | 10.81.15.255 |
| 33 | 10.81.16.0/25 | 10.81.16.1 – 10.81.16.126 | 10.81.16.127 |
| 34 | 10.81.16.128/25 | 10.81.16.129 – 10.81.16.254 | 10.81.16.255 |
| 35 | 10.81.17.0/25 | 10.81.17.1 – 10.81.17.126 | 10.81.17.127 |
| 36 | 10.81.17.128/25 | 10.81.17.129 – 10.81.17.254 | 10.81.17.255 |
| 37 | 10.81.18.0/25 | 10.81.18.1 – 10.81.18.126 | 10.81.18.127 |
| 38 | 10.81.18.128/25 | 10.81.18.129 – 10.81.18.254 | 10.81.18.255 |
| 39 | 10.81.19.0/25 | 10.81.19.1 – 10.81.19.126 | 10.81.19.127 |
| 40 | 10.81.19.128/25 | 10.81.19.129 – 10.81.19.254 | 10.81.19.255 |
| 41 | 10.81.20.0/25 | 10.81.20.1 – 10.81.20.126 | 10.81.20.127 |
| 42 | 10.81.20.128/25 | 10.81.20.129 – 10.81.20.254 | 10.81.20.255 |
| 43 | 10.81.21.0/25 | 10.81.21.1 – 10.81.21.126 | 10.81.21.127 |
| 44 | 10.81.21.128/25 | 10.81.21.129 – 10.81.21.254 | 10.81.21.255 |
| 45 | 10.81.22.0/25 | 10.81.22.1 – 10.81.22.126 | 10.81.22.127 |
| 46 | 10.81.22.128/25 | 10.81.22.129 – 10.81.22.254 | 10.81.22.255 |
| 47 | 10.81.23.0/25 | 10.81.23.1 – 10.81.23.126 | 10.81.23.127 |
| 48 | 10.81.23.128/25 | 10.81.23.129 – 10.81.23.254 | 10.81.23.255 |
| 49 | 10.81.24.0/25 | 10.81.24.1 – 10.81.24.126 | 10.81.24.127 |
| 50 | 10.81.24.128/25 | 10.81.24.129 – 10.81.24.254 | 10.81.24.255 |
| 51 | 10.81.25.0/25 | 10.81.25.1 – 10.81.25.126 | 10.81.25.127 |
| 52 | 10.81.25.128/25 | 10.81.25.129 – 10.81.25.254 | 10.81.25.255 |
| 53 | 10.81.26.0/25 | 10.81.26.1 – 10.81.26.126 | 10.81.26.127 |
| 54 | 10.81.26.128/25 | 10.81.26.129 – 10.81.26.254 | 10.81.26.255 |
| 55 | 10.81.27.0/25 | 10.81.27.1 – 10.81.27.126 | 10.81.27.127 |
| 56 | 10.81.27.128/25 | 10.81.27.129 – 10.81.27.254 | 10.81.27.255 |
| 57 | 10.81.28.0/25 | 10.81.28.1 – 10.81.28.126 | 10.81.28.127 |
| 58 | 10.81.28.128/25 | 10.81.28.129 – 10.81.28.254 | 10.81.28.255 |
| 59 | 10.81.29.0/25 | 10.81.29.1 – 10.81.29.126 | 10.81.29.127 |
| 60 | 10.81.29.128/25 | 10.81.29.129 – 10.81.29.254 | 10.81.29.255 |
| 61 | 10.81.30.0/25 | 10.81.30.1 – 10.81.30.126 | 10.81.30.127 |
| 62 | 10.81.30.128/25 | 10.81.30.129 – 10.81.30.254 | 10.81.30.255 |
| 63 | 10.81.31.0/25 | 10.81.31.1 – 10.81.31.126 | 10.81.31.127 |
| 64 | 10.81.31.128/25 | 10.81.31.129 – 10.81.31.254 | 10.81.31.255 |
| 65 | 10.81.32.0/25 | 10.81.32.1 – 10.81.32.126 | 10.81.32.127 |
| 66 | 10.81.32.128/25 | 10.81.32.129 – 10.81.32.254 | 10.81.32.255 |
| 67 | 10.81.33.0/25 | 10.81.33.1 – 10.81.33.126 | 10.81.33.127 |
| 68 | 10.81.33.128/25 | 10.81.33.129 – 10.81.33.254 | 10.81.33.255 |
| 69 | 10.81.34.0/25 | 10.81.34.1 – 10.81.34.126 | 10.81.34.127 |
| 70 | 10.81.34.128/25 | 10.81.34.129 – 10.81.34.254 | 10.81.34.255 |
| 71 | 10.81.35.0/25 | 10.81.35.1 – 10.81.35.126 | 10.81.35.127 |
| 72 | 10.81.35.128/25 | 10.81.35.129 – 10.81.35.254 | 10.81.35.255 |
| 73 | 10.81.36.0/25 | 10.81.36.1 – 10.81.36.126 | 10.81.36.127 |
| 74 | 10.81.36.128/25 | 10.81.36.129 – 10.81.36.254 | 10.81.36.255 |
| 75 | 10.81.37.0/25 | 10.81.37.1 – 10.81.37.126 | 10.81.37.127 |
| 76 | 10.81.37.128/25 | 10.81.37.129 – 10.81.37.254 | 10.81.37.255 |
| 77 | 10.81.38.0/25 | 10.81.38.1 – 10.81.38.126 | 10.81.38.127 |
| 78 | 10.81.38.128/25 | 10.81.38.129 – 10.81.38.254 | 10.81.38.255 |
| 79 | 10.81.39.0/25 | 10.81.39.1 – 10.81.39.126 | 10.81.39.127 |
| 80 | 10.81.39.128/25 | 10.81.39.129 – 10.81.39.254 | 10.81.39.255 |
| 81 | 10.81.40.0/25 | 10.81.40.1 – 10.81.40.126 | 10.81.40.127 |
| 82 | 10.81.40.128/25 | 10.81.40.129 – 10.81.40.254 | 10.81.40.255 |
| 83 | 10.81.41.0/25 | 10.81.41.1 – 10.81.41.126 | 10.81.41.127 |
| 84 | 10.81.41.128/25 | 10.81.41.129 – 10.81.41.254 | 10.81.41.255 |
| 85 | 10.81.42.0/25 | 10.81.42.1 – 10.81.42.126 | 10.81.42.127 |
| 86 | 10.81.42.128/25 | 10.81.42.129 – 10.81.42.254 | 10.81.42.255 |
| 87 | 10.81.43.0/25 | 10.81.43.1 – 10.81.43.126 | 10.81.43.127 |
| 88 | 10.81.43.128/25 | 10.81.43.129 – 10.81.43.254 | 10.81.43.255 |
| 89 | 10.81.44.0/25 | 10.81.44.1 – 10.81.44.126 | 10.81.44.127 |
| 90 | 10.81.44.128/25 | 10.81.44.129 – 10.81.44.254 | 10.81.44.255 |
| 91 | 10.81.45.0/25 | 10.81.45.1 – 10.81.45.126 | 10.81.45.127 |
| 92 | 10.81.45.128/25 | 10.81.45.129 – 10.81.45.254 | 10.81.45.255 |
| 93 | 10.81.46.0/25 | 10.81.46.1 – 10.81.46.126 | 10.81.46.127 |
| 94 | 10.81.46.128/25 | 10.81.46.129 – 10.81.46.254 | 10.81.46.255 |
| 95 | 10.81.47.0/25 | 10.81.47.1 – 10.81.47.126 | 10.81.47.127 |
| 96 | 10.81.47.128/25 | 10.81.47.129 – 10.81.47.254 | 10.81.47.255 |
| 97 | 10.81.48.0/25 | 10.81.48.1 – 10.81.48.126 | 10.81.48.127 |
| 98 | 10.81.48.128/25 | 10.81.48.129 – 10.81.48.254 | 10.81.48.255 |
| 99 | 10.81.49.0/25 | 10.81.49.1 – 10.81.49.126 | 10.81.49.127 |
| 100 | 10.81.49.128/25 | 10.81.49.129 – 10.81.49.254 | 10.81.49.255 |
| 101 | 10.81.50.0/25 | 10.81.50.1 – 10.81.50.126 | 10.81.50.127 |
| 102 | 10.81.50.128/25 | 10.81.50.129 – 10.81.50.254 | 10.81.50.255 |
| 103 | 10.81.51.0/25 | 10.81.51.1 – 10.81.51.126 | 10.81.51.127 |
| 104 | 10.81.51.128/25 | 10.81.51.129 – 10.81.51.254 | 10.81.51.255 |
| 105 | 10.81.52.0/25 | 10.81.52.1 – 10.81.52.126 | 10.81.52.127 |
| 106 | 10.81.52.128/25 | 10.81.52.129 – 10.81.52.254 | 10.81.52.255 |
| 107 | 10.81.53.0/25 | 10.81.53.1 – 10.81.53.126 | 10.81.53.127 |
| 108 | 10.81.53.128/25 | 10.81.53.129 – 10.81.53.254 | 10.81.53.255 |
| 109 | 10.81.54.0/25 | 10.81.54.1 – 10.81.54.126 | 10.81.54.127 |
| 110 | 10.81.54.128/25 | 10.81.54.129 – 10.81.54.254 | 10.81.54.255 |
| 111 | 10.81.55.0/25 | 10.81.55.1 – 10.81.55.126 | 10.81.55.127 |
| 112 | 10.81.55.128/25 | 10.81.55.129 – 10.81.55.254 | 10.81.55.255 |
| 113 | 10.81.56.0/25 | 10.81.56.1 – 10.81.56.126 | 10.81.56.127 |
| 114 | 10.81.56.128/25 | 10.81.56.129 – 10.81.56.254 | 10.81.56.255 |
| 115 | 10.81.57.0/25 | 10.81.57.1 – 10.81.57.126 | 10.81.57.127 |
| 116 | 10.81.57.128/25 | 10.81.57.129 – 10.81.57.254 | 10.81.57.255 |
| 117 | 10.81.58.0/25 | 10.81.58.1 – 10.81.58.126 | 10.81.58.127 |
| 118 | 10.81.58.128/25 | 10.81.58.129 – 10.81.58.254 | 10.81.58.255 |
| 119 | 10.81.59.0/25 | 10.81.59.1 – 10.81.59.126 | 10.81.59.127 |
| 120 | 10.81.59.128/25 | 10.81.59.129 – 10.81.59.254 | 10.81.59.255 |
| 121 | 10.81.60.0/25 | 10.81.60.1 – 10.81.60.126 | 10.81.60.127 |
| 122 | 10.81.60.128/25 | 10.81.60.129 – 10.81.60.254 | 10.81.60.255 |
| 123 | 10.81.61.0/25 | 10.81.61.1 – 10.81.61.126 | 10.81.61.127 |
| 124 | 10.81.61.128/25 | 10.81.61.129 – 10.81.61.254 | 10.81.61.255 |
| 125 | 10.81.62.0/25 | 10.81.62.1 – 10.81.62.126 | 10.81.62.127 |
| 126 | 10.81.62.128/25 | 10.81.62.129 – 10.81.62.254 | 10.81.62.255 |
| 127 | 10.81.63.0/25 | 10.81.63.1 – 10.81.63.126 | 10.81.63.127 |
| 128 | 10.81.63.128/25 | 10.81.63.129 – 10.81.63.254 | 10.81.63.255 |
| 129 | 10.81.64.0/25 | 10.81.64.1 – 10.81.64.126 | 10.81.64.127 |
| 130 | 10.81.64.128/25 | 10.81.64.129 – 10.81.64.254 | 10.81.64.255 |
| 131 | 10.81.65.0/25 | 10.81.65.1 – 10.81.65.126 | 10.81.65.127 |
| 132 | 10.81.65.128/25 | 10.81.65.129 – 10.81.65.254 | 10.81.65.255 |
| 133 | 10.81.66.0/25 | 10.81.66.1 – 10.81.66.126 | 10.81.66.127 |
| 134 | 10.81.66.128/25 | 10.81.66.129 – 10.81.66.254 | 10.81.66.255 |
| 135 | 10.81.67.0/25 | 10.81.67.1 – 10.81.67.126 | 10.81.67.127 |
| 136 | 10.81.67.128/25 | 10.81.67.129 – 10.81.67.254 | 10.81.67.255 |
| 137 | 10.81.68.0/25 | 10.81.68.1 – 10.81.68.126 | 10.81.68.127 |
| 138 | 10.81.68.128/25 | 10.81.68.129 – 10.81.68.254 | 10.81.68.255 |
| 139 | 10.81.69.0/25 | 10.81.69.1 – 10.81.69.126 | 10.81.69.127 |
| 140 | 10.81.69.128/25 | 10.81.69.129 – 10.81.69.254 | 10.81.69.255 |
| 141 | 10.81.70.0/25 | 10.81.70.1 – 10.81.70.126 | 10.81.70.127 |
| 142 | 10.81.70.128/25 | 10.81.70.129 – 10.81.70.254 | 10.81.70.255 |
| 143 | 10.81.71.0/25 | 10.81.71.1 – 10.81.71.126 | 10.81.71.127 |
| 144 | 10.81.71.128/25 | 10.81.71.129 – 10.81.71.254 | 10.81.71.255 |
| 145 | 10.81.72.0/25 | 10.81.72.1 – 10.81.72.126 | 10.81.72.127 |
| 146 | 10.81.72.128/25 | 10.81.72.129 – 10.81.72.254 | 10.81.72.255 |
| 147 | 10.81.73.0/25 | 10.81.73.1 – 10.81.73.126 | 10.81.73.127 |
| 148 | 10.81.73.128/25 | 10.81.73.129 – 10.81.73.254 | 10.81.73.255 |
| 149 | 10.81.74.0/25 | 10.81.74.1 – 10.81.74.126 | 10.81.74.127 |
| 150 | 10.81.74.128/25 | 10.81.74.129 – 10.81.74.254 | 10.81.74.255 |
| 151 | 10.81.75.0/25 | 10.81.75.1 – 10.81.75.126 | 10.81.75.127 |
| 152 | 10.81.75.128/25 | 10.81.75.129 – 10.81.75.254 | 10.81.75.255 |
| 153 | 10.81.76.0/25 | 10.81.76.1 – 10.81.76.126 | 10.81.76.127 |
| 154 | 10.81.76.128/25 | 10.81.76.129 – 10.81.76.254 | 10.81.76.255 |
| 155 | 10.81.77.0/25 | 10.81.77.1 – 10.81.77.126 | 10.81.77.127 |
| 156 | 10.81.77.128/25 | 10.81.77.129 – 10.81.77.254 | 10.81.77.255 |
| 157 | 10.81.78.0/25 | 10.81.78.1 – 10.81.78.126 | 10.81.78.127 |
| 158 | 10.81.78.128/25 | 10.81.78.129 – 10.81.78.254 | 10.81.78.255 |
| 159 | 10.81.79.0/25 | 10.81.79.1 – 10.81.79.126 | 10.81.79.127 |
| 160 | 10.81.79.128/25 | 10.81.79.129 – 10.81.79.254 | 10.81.79.255 |
| 161 | 10.81.80.0/25 | 10.81.80.1 – 10.81.80.126 | 10.81.80.127 |
| 162 | 10.81.80.128/25 | 10.81.80.129 – 10.81.80.254 | 10.81.80.255 |
| 163 | 10.81.81.0/25 | 10.81.81.1 – 10.81.81.126 | 10.81.81.127 |
| 164 | 10.81.81.128/25 | 10.81.81.129 – 10.81.81.254 | 10.81.81.255 |
| 165 | 10.81.82.0/25 | 10.81.82.1 – 10.81.82.126 | 10.81.82.127 |
| 166 | 10.81.82.128/25 | 10.81.82.129 – 10.81.82.254 | 10.81.82.255 |
| 167 | 10.81.83.0/25 | 10.81.83.1 – 10.81.83.126 | 10.81.83.127 |
| 168 | 10.81.83.128/25 | 10.81.83.129 – 10.81.83.254 | 10.81.83.255 |
| 169 | 10.81.84.0/25 | 10.81.84.1 – 10.81.84.126 | 10.81.84.127 |
| 170 | 10.81.84.128/25 | 10.81.84.129 – 10.81.84.254 | 10.81.84.255 |
| 171 | 10.81.85.0/25 | 10.81.85.1 – 10.81.85.126 | 10.81.85.127 |
| 172 | 10.81.85.128/25 | 10.81.85.129 – 10.81.85.254 | 10.81.85.255 |
| 173 | 10.81.86.0/25 | 10.81.86.1 – 10.81.86.126 | 10.81.86.127 |
| 174 | 10.81.86.128/25 | 10.81.86.129 – 10.81.86.254 | 10.81.86.255 |
| 175 | 10.81.87.0/25 | 10.81.87.1 – 10.81.87.126 | 10.81.87.127 |
| 176 | 10.81.87.128/25 | 10.81.87.129 – 10.81.87.254 | 10.81.87.255 |
| 177 | 10.81.88.0/25 | 10.81.88.1 – 10.81.88.126 | 10.81.88.127 |
| 178 | 10.81.88.128/25 | 10.81.88.129 – 10.81.88.254 | 10.81.88.255 |
| 179 | 10.81.89.0/25 | 10.81.89.1 – 10.81.89.126 | 10.81.89.127 |
| 180 | 10.81.89.128/25 | 10.81.89.129 – 10.81.89.254 | 10.81.89.255 |
| 181 | 10.81.90.0/25 | 10.81.90.1 – 10.81.90.126 | 10.81.90.127 |
| 182 | 10.81.90.128/25 | 10.81.90.129 – 10.81.90.254 | 10.81.90.255 |
| 183 | 10.81.91.0/25 | 10.81.91.1 – 10.81.91.126 | 10.81.91.127 |
| 184 | 10.81.91.128/25 | 10.81.91.129 – 10.81.91.254 | 10.81.91.255 |
| 185 | 10.81.92.0/25 | 10.81.92.1 – 10.81.92.126 | 10.81.92.127 |
| 186 | 10.81.92.128/25 | 10.81.92.129 – 10.81.92.254 | 10.81.92.255 |
| 187 | 10.81.93.0/25 | 10.81.93.1 – 10.81.93.126 | 10.81.93.127 |
| 188 | 10.81.93.128/25 | 10.81.93.129 – 10.81.93.254 | 10.81.93.255 |
| 189 | 10.81.94.0/25 | 10.81.94.1 – 10.81.94.126 | 10.81.94.127 |
| 190 | 10.81.94.128/25 | 10.81.94.129 – 10.81.94.254 | 10.81.94.255 |
| 191 | 10.81.95.0/25 | 10.81.95.1 – 10.81.95.126 | 10.81.95.127 |
| 192 | 10.81.95.128/25 | 10.81.95.129 – 10.81.95.254 | 10.81.95.255 |
| 193 | 10.81.96.0/25 | 10.81.96.1 – 10.81.96.126 | 10.81.96.127 |
| 194 | 10.81.96.128/25 | 10.81.96.129 – 10.81.96.254 | 10.81.96.255 |
| 195 | 10.81.97.0/25 | 10.81.97.1 – 10.81.97.126 | 10.81.97.127 |
| 196 | 10.81.97.128/25 | 10.81.97.129 – 10.81.97.254 | 10.81.97.255 |
| 197 | 10.81.98.0/25 | 10.81.98.1 – 10.81.98.126 | 10.81.98.127 |
| 198 | 10.81.98.128/25 | 10.81.98.129 – 10.81.98.254 | 10.81.98.255 |
| 199 | 10.81.99.0/25 | 10.81.99.1 – 10.81.99.126 | 10.81.99.127 |
| 200 | 10.81.99.128/25 | 10.81.99.129 – 10.81.99.254 | 10.81.99.255 |
| 201 | 10.81.100.0/25 | 10.81.100.1 – 10.81.100.126 | 10.81.100.127 |
| 202 | 10.81.100.128/25 | 10.81.100.129 – 10.81.100.254 | 10.81.100.255 |
| 203 | 10.81.101.0/25 | 10.81.101.1 – 10.81.101.126 | 10.81.101.127 |
| 204 | 10.81.101.128/25 | 10.81.101.129 – 10.81.101.254 | 10.81.101.255 |
| 205 | 10.81.102.0/25 | 10.81.102.1 – 10.81.102.126 | 10.81.102.127 |
| 206 | 10.81.102.128/25 | 10.81.102.129 – 10.81.102.254 | 10.81.102.255 |
| 207 | 10.81.103.0/25 | 10.81.103.1 – 10.81.103.126 | 10.81.103.127 |
| 208 | 10.81.103.128/25 | 10.81.103.129 – 10.81.103.254 | 10.81.103.255 |
| 209 | 10.81.104.0/25 | 10.81.104.1 – 10.81.104.126 | 10.81.104.127 |
| 210 | 10.81.104.128/25 | 10.81.104.129 – 10.81.104.254 | 10.81.104.255 |
| 211 | 10.81.105.0/25 | 10.81.105.1 – 10.81.105.126 | 10.81.105.127 |
| 212 | 10.81.105.128/25 | 10.81.105.129 – 10.81.105.254 | 10.81.105.255 |
| 213 | 10.81.106.0/25 | 10.81.106.1 – 10.81.106.126 | 10.81.106.127 |
| 214 | 10.81.106.128/25 | 10.81.106.129 – 10.81.106.254 | 10.81.106.255 |
| 215 | 10.81.107.0/25 | 10.81.107.1 – 10.81.107.126 | 10.81.107.127 |
| 216 | 10.81.107.128/25 | 10.81.107.129 – 10.81.107.254 | 10.81.107.255 |
| 217 | 10.81.108.0/25 | 10.81.108.1 – 10.81.108.126 | 10.81.108.127 |
| 218 | 10.81.108.128/25 | 10.81.108.129 – 10.81.108.254 | 10.81.108.255 |
| 219 | 10.81.109.0/25 | 10.81.109.1 – 10.81.109.126 | 10.81.109.127 |
| 220 | 10.81.109.128/25 | 10.81.109.129 – 10.81.109.254 | 10.81.109.255 |
| 221 | 10.81.110.0/25 | 10.81.110.1 – 10.81.110.126 | 10.81.110.127 |
| 222 | 10.81.110.128/25 | 10.81.110.129 – 10.81.110.254 | 10.81.110.255 |
| 223 | 10.81.111.0/25 | 10.81.111.1 – 10.81.111.126 | 10.81.111.127 |
| 224 | 10.81.111.128/25 | 10.81.111.129 – 10.81.111.254 | 10.81.111.255 |
| 225 | 10.81.112.0/25 | 10.81.112.1 – 10.81.112.126 | 10.81.112.127 |
| 226 | 10.81.112.128/25 | 10.81.112.129 – 10.81.112.254 | 10.81.112.255 |
| 227 | 10.81.113.0/25 | 10.81.113.1 – 10.81.113.126 | 10.81.113.127 |
| 228 | 10.81.113.128/25 | 10.81.113.129 – 10.81.113.254 | 10.81.113.255 |
| 229 | 10.81.114.0/25 | 10.81.114.1 – 10.81.114.126 | 10.81.114.127 |
| 230 | 10.81.114.128/25 | 10.81.114.129 – 10.81.114.254 | 10.81.114.255 |
| 231 | 10.81.115.0/25 | 10.81.115.1 – 10.81.115.126 | 10.81.115.127 |
| 232 | 10.81.115.128/25 | 10.81.115.129 – 10.81.115.254 | 10.81.115.255 |
| 233 | 10.81.116.0/25 | 10.81.116.1 – 10.81.116.126 | 10.81.116.127 |
| 234 | 10.81.116.128/25 | 10.81.116.129 – 10.81.116.254 | 10.81.116.255 |
| 235 | 10.81.117.0/25 | 10.81.117.1 – 10.81.117.126 | 10.81.117.127 |
| 236 | 10.81.117.128/25 | 10.81.117.129 – 10.81.117.254 | 10.81.117.255 |
| 237 | 10.81.118.0/25 | 10.81.118.1 – 10.81.118.126 | 10.81.118.127 |
| 238 | 10.81.118.128/25 | 10.81.118.129 – 10.81.118.254 | 10.81.118.255 |
| 239 | 10.81.119.0/25 | 10.81.119.1 – 10.81.119.126 | 10.81.119.127 |
| 240 | 10.81.119.128/25 | 10.81.119.129 – 10.81.119.254 | 10.81.119.255 |
| 241 | 10.81.120.0/25 | 10.81.120.1 – 10.81.120.126 | 10.81.120.127 |
| 242 | 10.81.120.128/25 | 10.81.120.129 – 10.81.120.254 | 10.81.120.255 |
| 243 | 10.81.121.0/25 | 10.81.121.1 – 10.81.121.126 | 10.81.121.127 |
| 244 | 10.81.121.128/25 | 10.81.121.129 – 10.81.121.254 | 10.81.121.255 |
| 245 | 10.81.122.0/25 | 10.81.122.1 – 10.81.122.126 | 10.81.122.127 |
| 246 | 10.81.122.128/25 | 10.81.122.129 – 10.81.122.254 | 10.81.122.255 |
| 247 | 10.81.123.0/25 | 10.81.123.1 – 10.81.123.126 | 10.81.123.127 |
| 248 | 10.81.123.128/25 | 10.81.123.129 – 10.81.123.254 | 10.81.123.255 |
| 249 | 10.81.124.0/25 | 10.81.124.1 – 10.81.124.126 | 10.81.124.127 |
| 250 | 10.81.124.128/25 | 10.81.124.129 – 10.81.124.254 | 10.81.124.255 |
| 251 | 10.81.125.0/25 | 10.81.125.1 – 10.81.125.126 | 10.81.125.127 |
| 252 | 10.81.125.128/25 | 10.81.125.129 – 10.81.125.254 | 10.81.125.255 |
| 253 | 10.81.126.0/25 | 10.81.126.1 – 10.81.126.126 | 10.81.126.127 |
| 254 | 10.81.126.128/25 | 10.81.126.129 – 10.81.126.254 | 10.81.126.255 |
| 255 | 10.81.127.0/25 | 10.81.127.1 – 10.81.127.126 | 10.81.127.127 |
| 256 | 10.81.127.128/25 | 10.81.127.129 – 10.81.127.254 | 10.81.127.255 |
showing 256 of 512
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 /16 |
|---|---|---|---|---|
| /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 | 1 |
| /17 | 255.255.128.0 | 32,768 | 32,766 | 2 split → |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 4 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 8 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 16 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 32 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 64 split → |
| /23 | 255.255.254.0 | 512 | 510 | 128 split → |
| /24 | 255.255.255.0 | 256 | 254 | 256 split → |
| /25 | 255.255.255.128 | 128 | 126 | 512 split → |
| /26 | 255.255.255.192 | 64 | 62 | 1,024 split → |
| /27 | 255.255.255.224 | 32 | 30 | 2,048 split → |
| /28 | 255.255.255.240 | 16 | 14 | 4,096 split → |
| /29 | 255.255.255.248 | 8 | 6 | 8,192 split → |
| /30 | 255.255.255.252 | 4 | 2 | 16,384 split → |
| /31 | 255.255.255.254 | 2 | 2 | 32,768 split → |
| /32 | 255.255.255.255 | 1 | 1 | 65,536 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.