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)10.81.128.0/17
network10.81.128.0/17
broadcast10.81.255.255
first host10.81.128.1
last host10.81.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.81.128.0/17
address00001010.01010001.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01010001.10000000.00000000
broadcast00001010.01010001.11111111.11111111
green = network part, grey = host part
hex0x0a518000
decimal173113344
reverse dns0.128.81.10.in-addr.arpa
ipv4-mapped::ffff:a51:8000
/17 split into /28 · 2,048 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.81.128.0/28 | 10.81.128.1 – 10.81.128.14 | 10.81.128.15 |
| 2 | 10.81.128.16/28 | 10.81.128.17 – 10.81.128.30 | 10.81.128.31 |
| 3 | 10.81.128.32/28 | 10.81.128.33 – 10.81.128.46 | 10.81.128.47 |
| 4 | 10.81.128.48/28 | 10.81.128.49 – 10.81.128.62 | 10.81.128.63 |
| 5 | 10.81.128.64/28 | 10.81.128.65 – 10.81.128.78 | 10.81.128.79 |
| 6 | 10.81.128.80/28 | 10.81.128.81 – 10.81.128.94 | 10.81.128.95 |
| 7 | 10.81.128.96/28 | 10.81.128.97 – 10.81.128.110 | 10.81.128.111 |
| 8 | 10.81.128.112/28 | 10.81.128.113 – 10.81.128.126 | 10.81.128.127 |
| 9 | 10.81.128.128/28 | 10.81.128.129 – 10.81.128.142 | 10.81.128.143 |
| 10 | 10.81.128.144/28 | 10.81.128.145 – 10.81.128.158 | 10.81.128.159 |
| 11 | 10.81.128.160/28 | 10.81.128.161 – 10.81.128.174 | 10.81.128.175 |
| 12 | 10.81.128.176/28 | 10.81.128.177 – 10.81.128.190 | 10.81.128.191 |
| 13 | 10.81.128.192/28 | 10.81.128.193 – 10.81.128.206 | 10.81.128.207 |
| 14 | 10.81.128.208/28 | 10.81.128.209 – 10.81.128.222 | 10.81.128.223 |
| 15 | 10.81.128.224/28 | 10.81.128.225 – 10.81.128.238 | 10.81.128.239 |
| 16 | 10.81.128.240/28 | 10.81.128.241 – 10.81.128.254 | 10.81.128.255 |
| 17 | 10.81.129.0/28 | 10.81.129.1 – 10.81.129.14 | 10.81.129.15 |
| 18 | 10.81.129.16/28 | 10.81.129.17 – 10.81.129.30 | 10.81.129.31 |
| 19 | 10.81.129.32/28 | 10.81.129.33 – 10.81.129.46 | 10.81.129.47 |
| 20 | 10.81.129.48/28 | 10.81.129.49 – 10.81.129.62 | 10.81.129.63 |
| 21 | 10.81.129.64/28 | 10.81.129.65 – 10.81.129.78 | 10.81.129.79 |
| 22 | 10.81.129.80/28 | 10.81.129.81 – 10.81.129.94 | 10.81.129.95 |
| 23 | 10.81.129.96/28 | 10.81.129.97 – 10.81.129.110 | 10.81.129.111 |
| 24 | 10.81.129.112/28 | 10.81.129.113 – 10.81.129.126 | 10.81.129.127 |
| 25 | 10.81.129.128/28 | 10.81.129.129 – 10.81.129.142 | 10.81.129.143 |
| 26 | 10.81.129.144/28 | 10.81.129.145 – 10.81.129.158 | 10.81.129.159 |
| 27 | 10.81.129.160/28 | 10.81.129.161 – 10.81.129.174 | 10.81.129.175 |
| 28 | 10.81.129.176/28 | 10.81.129.177 – 10.81.129.190 | 10.81.129.191 |
| 29 | 10.81.129.192/28 | 10.81.129.193 – 10.81.129.206 | 10.81.129.207 |
| 30 | 10.81.129.208/28 | 10.81.129.209 – 10.81.129.222 | 10.81.129.223 |
| 31 | 10.81.129.224/28 | 10.81.129.225 – 10.81.129.238 | 10.81.129.239 |
| 32 | 10.81.129.240/28 | 10.81.129.241 – 10.81.129.254 | 10.81.129.255 |
| 33 | 10.81.130.0/28 | 10.81.130.1 – 10.81.130.14 | 10.81.130.15 |
| 34 | 10.81.130.16/28 | 10.81.130.17 – 10.81.130.30 | 10.81.130.31 |
| 35 | 10.81.130.32/28 | 10.81.130.33 – 10.81.130.46 | 10.81.130.47 |
| 36 | 10.81.130.48/28 | 10.81.130.49 – 10.81.130.62 | 10.81.130.63 |
| 37 | 10.81.130.64/28 | 10.81.130.65 – 10.81.130.78 | 10.81.130.79 |
| 38 | 10.81.130.80/28 | 10.81.130.81 – 10.81.130.94 | 10.81.130.95 |
| 39 | 10.81.130.96/28 | 10.81.130.97 – 10.81.130.110 | 10.81.130.111 |
| 40 | 10.81.130.112/28 | 10.81.130.113 – 10.81.130.126 | 10.81.130.127 |
| 41 | 10.81.130.128/28 | 10.81.130.129 – 10.81.130.142 | 10.81.130.143 |
| 42 | 10.81.130.144/28 | 10.81.130.145 – 10.81.130.158 | 10.81.130.159 |
| 43 | 10.81.130.160/28 | 10.81.130.161 – 10.81.130.174 | 10.81.130.175 |
| 44 | 10.81.130.176/28 | 10.81.130.177 – 10.81.130.190 | 10.81.130.191 |
| 45 | 10.81.130.192/28 | 10.81.130.193 – 10.81.130.206 | 10.81.130.207 |
| 46 | 10.81.130.208/28 | 10.81.130.209 – 10.81.130.222 | 10.81.130.223 |
| 47 | 10.81.130.224/28 | 10.81.130.225 – 10.81.130.238 | 10.81.130.239 |
| 48 | 10.81.130.240/28 | 10.81.130.241 – 10.81.130.254 | 10.81.130.255 |
| 49 | 10.81.131.0/28 | 10.81.131.1 – 10.81.131.14 | 10.81.131.15 |
| 50 | 10.81.131.16/28 | 10.81.131.17 – 10.81.131.30 | 10.81.131.31 |
| 51 | 10.81.131.32/28 | 10.81.131.33 – 10.81.131.46 | 10.81.131.47 |
| 52 | 10.81.131.48/28 | 10.81.131.49 – 10.81.131.62 | 10.81.131.63 |
| 53 | 10.81.131.64/28 | 10.81.131.65 – 10.81.131.78 | 10.81.131.79 |
| 54 | 10.81.131.80/28 | 10.81.131.81 – 10.81.131.94 | 10.81.131.95 |
| 55 | 10.81.131.96/28 | 10.81.131.97 – 10.81.131.110 | 10.81.131.111 |
| 56 | 10.81.131.112/28 | 10.81.131.113 – 10.81.131.126 | 10.81.131.127 |
| 57 | 10.81.131.128/28 | 10.81.131.129 – 10.81.131.142 | 10.81.131.143 |
| 58 | 10.81.131.144/28 | 10.81.131.145 – 10.81.131.158 | 10.81.131.159 |
| 59 | 10.81.131.160/28 | 10.81.131.161 – 10.81.131.174 | 10.81.131.175 |
| 60 | 10.81.131.176/28 | 10.81.131.177 – 10.81.131.190 | 10.81.131.191 |
| 61 | 10.81.131.192/28 | 10.81.131.193 – 10.81.131.206 | 10.81.131.207 |
| 62 | 10.81.131.208/28 | 10.81.131.209 – 10.81.131.222 | 10.81.131.223 |
| 63 | 10.81.131.224/28 | 10.81.131.225 – 10.81.131.238 | 10.81.131.239 |
| 64 | 10.81.131.240/28 | 10.81.131.241 – 10.81.131.254 | 10.81.131.255 |
| 65 | 10.81.132.0/28 | 10.81.132.1 – 10.81.132.14 | 10.81.132.15 |
| 66 | 10.81.132.16/28 | 10.81.132.17 – 10.81.132.30 | 10.81.132.31 |
| 67 | 10.81.132.32/28 | 10.81.132.33 – 10.81.132.46 | 10.81.132.47 |
| 68 | 10.81.132.48/28 | 10.81.132.49 – 10.81.132.62 | 10.81.132.63 |
| 69 | 10.81.132.64/28 | 10.81.132.65 – 10.81.132.78 | 10.81.132.79 |
| 70 | 10.81.132.80/28 | 10.81.132.81 – 10.81.132.94 | 10.81.132.95 |
| 71 | 10.81.132.96/28 | 10.81.132.97 – 10.81.132.110 | 10.81.132.111 |
| 72 | 10.81.132.112/28 | 10.81.132.113 – 10.81.132.126 | 10.81.132.127 |
| 73 | 10.81.132.128/28 | 10.81.132.129 – 10.81.132.142 | 10.81.132.143 |
| 74 | 10.81.132.144/28 | 10.81.132.145 – 10.81.132.158 | 10.81.132.159 |
| 75 | 10.81.132.160/28 | 10.81.132.161 – 10.81.132.174 | 10.81.132.175 |
| 76 | 10.81.132.176/28 | 10.81.132.177 – 10.81.132.190 | 10.81.132.191 |
| 77 | 10.81.132.192/28 | 10.81.132.193 – 10.81.132.206 | 10.81.132.207 |
| 78 | 10.81.132.208/28 | 10.81.132.209 – 10.81.132.222 | 10.81.132.223 |
| 79 | 10.81.132.224/28 | 10.81.132.225 – 10.81.132.238 | 10.81.132.239 |
| 80 | 10.81.132.240/28 | 10.81.132.241 – 10.81.132.254 | 10.81.132.255 |
| 81 | 10.81.133.0/28 | 10.81.133.1 – 10.81.133.14 | 10.81.133.15 |
| 82 | 10.81.133.16/28 | 10.81.133.17 – 10.81.133.30 | 10.81.133.31 |
| 83 | 10.81.133.32/28 | 10.81.133.33 – 10.81.133.46 | 10.81.133.47 |
| 84 | 10.81.133.48/28 | 10.81.133.49 – 10.81.133.62 | 10.81.133.63 |
| 85 | 10.81.133.64/28 | 10.81.133.65 – 10.81.133.78 | 10.81.133.79 |
| 86 | 10.81.133.80/28 | 10.81.133.81 – 10.81.133.94 | 10.81.133.95 |
| 87 | 10.81.133.96/28 | 10.81.133.97 – 10.81.133.110 | 10.81.133.111 |
| 88 | 10.81.133.112/28 | 10.81.133.113 – 10.81.133.126 | 10.81.133.127 |
| 89 | 10.81.133.128/28 | 10.81.133.129 – 10.81.133.142 | 10.81.133.143 |
| 90 | 10.81.133.144/28 | 10.81.133.145 – 10.81.133.158 | 10.81.133.159 |
| 91 | 10.81.133.160/28 | 10.81.133.161 – 10.81.133.174 | 10.81.133.175 |
| 92 | 10.81.133.176/28 | 10.81.133.177 – 10.81.133.190 | 10.81.133.191 |
| 93 | 10.81.133.192/28 | 10.81.133.193 – 10.81.133.206 | 10.81.133.207 |
| 94 | 10.81.133.208/28 | 10.81.133.209 – 10.81.133.222 | 10.81.133.223 |
| 95 | 10.81.133.224/28 | 10.81.133.225 – 10.81.133.238 | 10.81.133.239 |
| 96 | 10.81.133.240/28 | 10.81.133.241 – 10.81.133.254 | 10.81.133.255 |
| 97 | 10.81.134.0/28 | 10.81.134.1 – 10.81.134.14 | 10.81.134.15 |
| 98 | 10.81.134.16/28 | 10.81.134.17 – 10.81.134.30 | 10.81.134.31 |
| 99 | 10.81.134.32/28 | 10.81.134.33 – 10.81.134.46 | 10.81.134.47 |
| 100 | 10.81.134.48/28 | 10.81.134.49 – 10.81.134.62 | 10.81.134.63 |
| 101 | 10.81.134.64/28 | 10.81.134.65 – 10.81.134.78 | 10.81.134.79 |
| 102 | 10.81.134.80/28 | 10.81.134.81 – 10.81.134.94 | 10.81.134.95 |
| 103 | 10.81.134.96/28 | 10.81.134.97 – 10.81.134.110 | 10.81.134.111 |
| 104 | 10.81.134.112/28 | 10.81.134.113 – 10.81.134.126 | 10.81.134.127 |
| 105 | 10.81.134.128/28 | 10.81.134.129 – 10.81.134.142 | 10.81.134.143 |
| 106 | 10.81.134.144/28 | 10.81.134.145 – 10.81.134.158 | 10.81.134.159 |
| 107 | 10.81.134.160/28 | 10.81.134.161 – 10.81.134.174 | 10.81.134.175 |
| 108 | 10.81.134.176/28 | 10.81.134.177 – 10.81.134.190 | 10.81.134.191 |
| 109 | 10.81.134.192/28 | 10.81.134.193 – 10.81.134.206 | 10.81.134.207 |
| 110 | 10.81.134.208/28 | 10.81.134.209 – 10.81.134.222 | 10.81.134.223 |
| 111 | 10.81.134.224/28 | 10.81.134.225 – 10.81.134.238 | 10.81.134.239 |
| 112 | 10.81.134.240/28 | 10.81.134.241 – 10.81.134.254 | 10.81.134.255 |
| 113 | 10.81.135.0/28 | 10.81.135.1 – 10.81.135.14 | 10.81.135.15 |
| 114 | 10.81.135.16/28 | 10.81.135.17 – 10.81.135.30 | 10.81.135.31 |
| 115 | 10.81.135.32/28 | 10.81.135.33 – 10.81.135.46 | 10.81.135.47 |
| 116 | 10.81.135.48/28 | 10.81.135.49 – 10.81.135.62 | 10.81.135.63 |
| 117 | 10.81.135.64/28 | 10.81.135.65 – 10.81.135.78 | 10.81.135.79 |
| 118 | 10.81.135.80/28 | 10.81.135.81 – 10.81.135.94 | 10.81.135.95 |
| 119 | 10.81.135.96/28 | 10.81.135.97 – 10.81.135.110 | 10.81.135.111 |
| 120 | 10.81.135.112/28 | 10.81.135.113 – 10.81.135.126 | 10.81.135.127 |
| 121 | 10.81.135.128/28 | 10.81.135.129 – 10.81.135.142 | 10.81.135.143 |
| 122 | 10.81.135.144/28 | 10.81.135.145 – 10.81.135.158 | 10.81.135.159 |
| 123 | 10.81.135.160/28 | 10.81.135.161 – 10.81.135.174 | 10.81.135.175 |
| 124 | 10.81.135.176/28 | 10.81.135.177 – 10.81.135.190 | 10.81.135.191 |
| 125 | 10.81.135.192/28 | 10.81.135.193 – 10.81.135.206 | 10.81.135.207 |
| 126 | 10.81.135.208/28 | 10.81.135.209 – 10.81.135.222 | 10.81.135.223 |
| 127 | 10.81.135.224/28 | 10.81.135.225 – 10.81.135.238 | 10.81.135.239 |
| 128 | 10.81.135.240/28 | 10.81.135.241 – 10.81.135.254 | 10.81.135.255 |
| 129 | 10.81.136.0/28 | 10.81.136.1 – 10.81.136.14 | 10.81.136.15 |
| 130 | 10.81.136.16/28 | 10.81.136.17 – 10.81.136.30 | 10.81.136.31 |
| 131 | 10.81.136.32/28 | 10.81.136.33 – 10.81.136.46 | 10.81.136.47 |
| 132 | 10.81.136.48/28 | 10.81.136.49 – 10.81.136.62 | 10.81.136.63 |
| 133 | 10.81.136.64/28 | 10.81.136.65 – 10.81.136.78 | 10.81.136.79 |
| 134 | 10.81.136.80/28 | 10.81.136.81 – 10.81.136.94 | 10.81.136.95 |
| 135 | 10.81.136.96/28 | 10.81.136.97 – 10.81.136.110 | 10.81.136.111 |
| 136 | 10.81.136.112/28 | 10.81.136.113 – 10.81.136.126 | 10.81.136.127 |
| 137 | 10.81.136.128/28 | 10.81.136.129 – 10.81.136.142 | 10.81.136.143 |
| 138 | 10.81.136.144/28 | 10.81.136.145 – 10.81.136.158 | 10.81.136.159 |
| 139 | 10.81.136.160/28 | 10.81.136.161 – 10.81.136.174 | 10.81.136.175 |
| 140 | 10.81.136.176/28 | 10.81.136.177 – 10.81.136.190 | 10.81.136.191 |
| 141 | 10.81.136.192/28 | 10.81.136.193 – 10.81.136.206 | 10.81.136.207 |
| 142 | 10.81.136.208/28 | 10.81.136.209 – 10.81.136.222 | 10.81.136.223 |
| 143 | 10.81.136.224/28 | 10.81.136.225 – 10.81.136.238 | 10.81.136.239 |
| 144 | 10.81.136.240/28 | 10.81.136.241 – 10.81.136.254 | 10.81.136.255 |
| 145 | 10.81.137.0/28 | 10.81.137.1 – 10.81.137.14 | 10.81.137.15 |
| 146 | 10.81.137.16/28 | 10.81.137.17 – 10.81.137.30 | 10.81.137.31 |
| 147 | 10.81.137.32/28 | 10.81.137.33 – 10.81.137.46 | 10.81.137.47 |
| 148 | 10.81.137.48/28 | 10.81.137.49 – 10.81.137.62 | 10.81.137.63 |
| 149 | 10.81.137.64/28 | 10.81.137.65 – 10.81.137.78 | 10.81.137.79 |
| 150 | 10.81.137.80/28 | 10.81.137.81 – 10.81.137.94 | 10.81.137.95 |
| 151 | 10.81.137.96/28 | 10.81.137.97 – 10.81.137.110 | 10.81.137.111 |
| 152 | 10.81.137.112/28 | 10.81.137.113 – 10.81.137.126 | 10.81.137.127 |
| 153 | 10.81.137.128/28 | 10.81.137.129 – 10.81.137.142 | 10.81.137.143 |
| 154 | 10.81.137.144/28 | 10.81.137.145 – 10.81.137.158 | 10.81.137.159 |
| 155 | 10.81.137.160/28 | 10.81.137.161 – 10.81.137.174 | 10.81.137.175 |
| 156 | 10.81.137.176/28 | 10.81.137.177 – 10.81.137.190 | 10.81.137.191 |
| 157 | 10.81.137.192/28 | 10.81.137.193 – 10.81.137.206 | 10.81.137.207 |
| 158 | 10.81.137.208/28 | 10.81.137.209 – 10.81.137.222 | 10.81.137.223 |
| 159 | 10.81.137.224/28 | 10.81.137.225 – 10.81.137.238 | 10.81.137.239 |
| 160 | 10.81.137.240/28 | 10.81.137.241 – 10.81.137.254 | 10.81.137.255 |
| 161 | 10.81.138.0/28 | 10.81.138.1 – 10.81.138.14 | 10.81.138.15 |
| 162 | 10.81.138.16/28 | 10.81.138.17 – 10.81.138.30 | 10.81.138.31 |
| 163 | 10.81.138.32/28 | 10.81.138.33 – 10.81.138.46 | 10.81.138.47 |
| 164 | 10.81.138.48/28 | 10.81.138.49 – 10.81.138.62 | 10.81.138.63 |
| 165 | 10.81.138.64/28 | 10.81.138.65 – 10.81.138.78 | 10.81.138.79 |
| 166 | 10.81.138.80/28 | 10.81.138.81 – 10.81.138.94 | 10.81.138.95 |
| 167 | 10.81.138.96/28 | 10.81.138.97 – 10.81.138.110 | 10.81.138.111 |
| 168 | 10.81.138.112/28 | 10.81.138.113 – 10.81.138.126 | 10.81.138.127 |
| 169 | 10.81.138.128/28 | 10.81.138.129 – 10.81.138.142 | 10.81.138.143 |
| 170 | 10.81.138.144/28 | 10.81.138.145 – 10.81.138.158 | 10.81.138.159 |
| 171 | 10.81.138.160/28 | 10.81.138.161 – 10.81.138.174 | 10.81.138.175 |
| 172 | 10.81.138.176/28 | 10.81.138.177 – 10.81.138.190 | 10.81.138.191 |
| 173 | 10.81.138.192/28 | 10.81.138.193 – 10.81.138.206 | 10.81.138.207 |
| 174 | 10.81.138.208/28 | 10.81.138.209 – 10.81.138.222 | 10.81.138.223 |
| 175 | 10.81.138.224/28 | 10.81.138.225 – 10.81.138.238 | 10.81.138.239 |
| 176 | 10.81.138.240/28 | 10.81.138.241 – 10.81.138.254 | 10.81.138.255 |
| 177 | 10.81.139.0/28 | 10.81.139.1 – 10.81.139.14 | 10.81.139.15 |
| 178 | 10.81.139.16/28 | 10.81.139.17 – 10.81.139.30 | 10.81.139.31 |
| 179 | 10.81.139.32/28 | 10.81.139.33 – 10.81.139.46 | 10.81.139.47 |
| 180 | 10.81.139.48/28 | 10.81.139.49 – 10.81.139.62 | 10.81.139.63 |
| 181 | 10.81.139.64/28 | 10.81.139.65 – 10.81.139.78 | 10.81.139.79 |
| 182 | 10.81.139.80/28 | 10.81.139.81 – 10.81.139.94 | 10.81.139.95 |
| 183 | 10.81.139.96/28 | 10.81.139.97 – 10.81.139.110 | 10.81.139.111 |
| 184 | 10.81.139.112/28 | 10.81.139.113 – 10.81.139.126 | 10.81.139.127 |
| 185 | 10.81.139.128/28 | 10.81.139.129 – 10.81.139.142 | 10.81.139.143 |
| 186 | 10.81.139.144/28 | 10.81.139.145 – 10.81.139.158 | 10.81.139.159 |
| 187 | 10.81.139.160/28 | 10.81.139.161 – 10.81.139.174 | 10.81.139.175 |
| 188 | 10.81.139.176/28 | 10.81.139.177 – 10.81.139.190 | 10.81.139.191 |
| 189 | 10.81.139.192/28 | 10.81.139.193 – 10.81.139.206 | 10.81.139.207 |
| 190 | 10.81.139.208/28 | 10.81.139.209 – 10.81.139.222 | 10.81.139.223 |
| 191 | 10.81.139.224/28 | 10.81.139.225 – 10.81.139.238 | 10.81.139.239 |
| 192 | 10.81.139.240/28 | 10.81.139.241 – 10.81.139.254 | 10.81.139.255 |
| 193 | 10.81.140.0/28 | 10.81.140.1 – 10.81.140.14 | 10.81.140.15 |
| 194 | 10.81.140.16/28 | 10.81.140.17 – 10.81.140.30 | 10.81.140.31 |
| 195 | 10.81.140.32/28 | 10.81.140.33 – 10.81.140.46 | 10.81.140.47 |
| 196 | 10.81.140.48/28 | 10.81.140.49 – 10.81.140.62 | 10.81.140.63 |
| 197 | 10.81.140.64/28 | 10.81.140.65 – 10.81.140.78 | 10.81.140.79 |
| 198 | 10.81.140.80/28 | 10.81.140.81 – 10.81.140.94 | 10.81.140.95 |
| 199 | 10.81.140.96/28 | 10.81.140.97 – 10.81.140.110 | 10.81.140.111 |
| 200 | 10.81.140.112/28 | 10.81.140.113 – 10.81.140.126 | 10.81.140.127 |
| 201 | 10.81.140.128/28 | 10.81.140.129 – 10.81.140.142 | 10.81.140.143 |
| 202 | 10.81.140.144/28 | 10.81.140.145 – 10.81.140.158 | 10.81.140.159 |
| 203 | 10.81.140.160/28 | 10.81.140.161 – 10.81.140.174 | 10.81.140.175 |
| 204 | 10.81.140.176/28 | 10.81.140.177 – 10.81.140.190 | 10.81.140.191 |
| 205 | 10.81.140.192/28 | 10.81.140.193 – 10.81.140.206 | 10.81.140.207 |
| 206 | 10.81.140.208/28 | 10.81.140.209 – 10.81.140.222 | 10.81.140.223 |
| 207 | 10.81.140.224/28 | 10.81.140.225 – 10.81.140.238 | 10.81.140.239 |
| 208 | 10.81.140.240/28 | 10.81.140.241 – 10.81.140.254 | 10.81.140.255 |
| 209 | 10.81.141.0/28 | 10.81.141.1 – 10.81.141.14 | 10.81.141.15 |
| 210 | 10.81.141.16/28 | 10.81.141.17 – 10.81.141.30 | 10.81.141.31 |
| 211 | 10.81.141.32/28 | 10.81.141.33 – 10.81.141.46 | 10.81.141.47 |
| 212 | 10.81.141.48/28 | 10.81.141.49 – 10.81.141.62 | 10.81.141.63 |
| 213 | 10.81.141.64/28 | 10.81.141.65 – 10.81.141.78 | 10.81.141.79 |
| 214 | 10.81.141.80/28 | 10.81.141.81 – 10.81.141.94 | 10.81.141.95 |
| 215 | 10.81.141.96/28 | 10.81.141.97 – 10.81.141.110 | 10.81.141.111 |
| 216 | 10.81.141.112/28 | 10.81.141.113 – 10.81.141.126 | 10.81.141.127 |
| 217 | 10.81.141.128/28 | 10.81.141.129 – 10.81.141.142 | 10.81.141.143 |
| 218 | 10.81.141.144/28 | 10.81.141.145 – 10.81.141.158 | 10.81.141.159 |
| 219 | 10.81.141.160/28 | 10.81.141.161 – 10.81.141.174 | 10.81.141.175 |
| 220 | 10.81.141.176/28 | 10.81.141.177 – 10.81.141.190 | 10.81.141.191 |
| 221 | 10.81.141.192/28 | 10.81.141.193 – 10.81.141.206 | 10.81.141.207 |
| 222 | 10.81.141.208/28 | 10.81.141.209 – 10.81.141.222 | 10.81.141.223 |
| 223 | 10.81.141.224/28 | 10.81.141.225 – 10.81.141.238 | 10.81.141.239 |
| 224 | 10.81.141.240/28 | 10.81.141.241 – 10.81.141.254 | 10.81.141.255 |
| 225 | 10.81.142.0/28 | 10.81.142.1 – 10.81.142.14 | 10.81.142.15 |
| 226 | 10.81.142.16/28 | 10.81.142.17 – 10.81.142.30 | 10.81.142.31 |
| 227 | 10.81.142.32/28 | 10.81.142.33 – 10.81.142.46 | 10.81.142.47 |
| 228 | 10.81.142.48/28 | 10.81.142.49 – 10.81.142.62 | 10.81.142.63 |
| 229 | 10.81.142.64/28 | 10.81.142.65 – 10.81.142.78 | 10.81.142.79 |
| 230 | 10.81.142.80/28 | 10.81.142.81 – 10.81.142.94 | 10.81.142.95 |
| 231 | 10.81.142.96/28 | 10.81.142.97 – 10.81.142.110 | 10.81.142.111 |
| 232 | 10.81.142.112/28 | 10.81.142.113 – 10.81.142.126 | 10.81.142.127 |
| 233 | 10.81.142.128/28 | 10.81.142.129 – 10.81.142.142 | 10.81.142.143 |
| 234 | 10.81.142.144/28 | 10.81.142.145 – 10.81.142.158 | 10.81.142.159 |
| 235 | 10.81.142.160/28 | 10.81.142.161 – 10.81.142.174 | 10.81.142.175 |
| 236 | 10.81.142.176/28 | 10.81.142.177 – 10.81.142.190 | 10.81.142.191 |
| 237 | 10.81.142.192/28 | 10.81.142.193 – 10.81.142.206 | 10.81.142.207 |
| 238 | 10.81.142.208/28 | 10.81.142.209 – 10.81.142.222 | 10.81.142.223 |
| 239 | 10.81.142.224/28 | 10.81.142.225 – 10.81.142.238 | 10.81.142.239 |
| 240 | 10.81.142.240/28 | 10.81.142.241 – 10.81.142.254 | 10.81.142.255 |
| 241 | 10.81.143.0/28 | 10.81.143.1 – 10.81.143.14 | 10.81.143.15 |
| 242 | 10.81.143.16/28 | 10.81.143.17 – 10.81.143.30 | 10.81.143.31 |
| 243 | 10.81.143.32/28 | 10.81.143.33 – 10.81.143.46 | 10.81.143.47 |
| 244 | 10.81.143.48/28 | 10.81.143.49 – 10.81.143.62 | 10.81.143.63 |
| 245 | 10.81.143.64/28 | 10.81.143.65 – 10.81.143.78 | 10.81.143.79 |
| 246 | 10.81.143.80/28 | 10.81.143.81 – 10.81.143.94 | 10.81.143.95 |
| 247 | 10.81.143.96/28 | 10.81.143.97 – 10.81.143.110 | 10.81.143.111 |
| 248 | 10.81.143.112/28 | 10.81.143.113 – 10.81.143.126 | 10.81.143.127 |
| 249 | 10.81.143.128/28 | 10.81.143.129 – 10.81.143.142 | 10.81.143.143 |
| 250 | 10.81.143.144/28 | 10.81.143.145 – 10.81.143.158 | 10.81.143.159 |
| 251 | 10.81.143.160/28 | 10.81.143.161 – 10.81.143.174 | 10.81.143.175 |
| 252 | 10.81.143.176/28 | 10.81.143.177 – 10.81.143.190 | 10.81.143.191 |
| 253 | 10.81.143.192/28 | 10.81.143.193 – 10.81.143.206 | 10.81.143.207 |
| 254 | 10.81.143.208/28 | 10.81.143.209 – 10.81.143.222 | 10.81.143.223 |
| 255 | 10.81.143.224/28 | 10.81.143.225 – 10.81.143.238 | 10.81.143.239 |
| 256 | 10.81.143.240/28 | 10.81.143.241 – 10.81.143.254 | 10.81.143.255 |
showing 256 of 2,048
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 /17 |
|---|---|---|---|---|
| /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 | 1 |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 2 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 4 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 8 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 16 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 32 split → |
| /23 | 255.255.254.0 | 512 | 510 | 64 split → |
| /24 | 255.255.255.0 | 256 | 254 | 128 split → |
| /25 | 255.255.255.128 | 128 | 126 | 256 split → |
| /26 | 255.255.255.192 | 64 | 62 | 512 split → |
| /27 | 255.255.255.224 | 32 | 30 | 1,024 split → |
| /28 | 255.255.255.240 | 16 | 14 | 2,048 split → |
| /29 | 255.255.255.248 | 8 | 6 | 4,096 split → |
| /30 | 255.255.255.252 | 4 | 2 | 8,192 split → |
| /31 | 255.255.255.254 | 2 | 2 | 16,384 split → |
| /32 | 255.255.255.255 | 1 | 1 | 32,768 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.