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)10.21.64.0/19
network10.21.64.0/19
broadcast10.21.95.255
first host10.21.64.1
last host10.21.95.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.21.64.0/19
address00001010.00010101.01000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010101.01000000.00000000
broadcast00001010.00010101.01011111.11111111
green = network part, grey = host part
hex0x0a154000
decimal169164800
reverse dns0.64.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:4000
/19 split into /28 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.64.0/28 | 10.21.64.1 – 10.21.64.14 | 10.21.64.15 |
| 2 | 10.21.64.16/28 | 10.21.64.17 – 10.21.64.30 | 10.21.64.31 |
| 3 | 10.21.64.32/28 | 10.21.64.33 – 10.21.64.46 | 10.21.64.47 |
| 4 | 10.21.64.48/28 | 10.21.64.49 – 10.21.64.62 | 10.21.64.63 |
| 5 | 10.21.64.64/28 | 10.21.64.65 – 10.21.64.78 | 10.21.64.79 |
| 6 | 10.21.64.80/28 | 10.21.64.81 – 10.21.64.94 | 10.21.64.95 |
| 7 | 10.21.64.96/28 | 10.21.64.97 – 10.21.64.110 | 10.21.64.111 |
| 8 | 10.21.64.112/28 | 10.21.64.113 – 10.21.64.126 | 10.21.64.127 |
| 9 | 10.21.64.128/28 | 10.21.64.129 – 10.21.64.142 | 10.21.64.143 |
| 10 | 10.21.64.144/28 | 10.21.64.145 – 10.21.64.158 | 10.21.64.159 |
| 11 | 10.21.64.160/28 | 10.21.64.161 – 10.21.64.174 | 10.21.64.175 |
| 12 | 10.21.64.176/28 | 10.21.64.177 – 10.21.64.190 | 10.21.64.191 |
| 13 | 10.21.64.192/28 | 10.21.64.193 – 10.21.64.206 | 10.21.64.207 |
| 14 | 10.21.64.208/28 | 10.21.64.209 – 10.21.64.222 | 10.21.64.223 |
| 15 | 10.21.64.224/28 | 10.21.64.225 – 10.21.64.238 | 10.21.64.239 |
| 16 | 10.21.64.240/28 | 10.21.64.241 – 10.21.64.254 | 10.21.64.255 |
| 17 | 10.21.65.0/28 | 10.21.65.1 – 10.21.65.14 | 10.21.65.15 |
| 18 | 10.21.65.16/28 | 10.21.65.17 – 10.21.65.30 | 10.21.65.31 |
| 19 | 10.21.65.32/28 | 10.21.65.33 – 10.21.65.46 | 10.21.65.47 |
| 20 | 10.21.65.48/28 | 10.21.65.49 – 10.21.65.62 | 10.21.65.63 |
| 21 | 10.21.65.64/28 | 10.21.65.65 – 10.21.65.78 | 10.21.65.79 |
| 22 | 10.21.65.80/28 | 10.21.65.81 – 10.21.65.94 | 10.21.65.95 |
| 23 | 10.21.65.96/28 | 10.21.65.97 – 10.21.65.110 | 10.21.65.111 |
| 24 | 10.21.65.112/28 | 10.21.65.113 – 10.21.65.126 | 10.21.65.127 |
| 25 | 10.21.65.128/28 | 10.21.65.129 – 10.21.65.142 | 10.21.65.143 |
| 26 | 10.21.65.144/28 | 10.21.65.145 – 10.21.65.158 | 10.21.65.159 |
| 27 | 10.21.65.160/28 | 10.21.65.161 – 10.21.65.174 | 10.21.65.175 |
| 28 | 10.21.65.176/28 | 10.21.65.177 – 10.21.65.190 | 10.21.65.191 |
| 29 | 10.21.65.192/28 | 10.21.65.193 – 10.21.65.206 | 10.21.65.207 |
| 30 | 10.21.65.208/28 | 10.21.65.209 – 10.21.65.222 | 10.21.65.223 |
| 31 | 10.21.65.224/28 | 10.21.65.225 – 10.21.65.238 | 10.21.65.239 |
| 32 | 10.21.65.240/28 | 10.21.65.241 – 10.21.65.254 | 10.21.65.255 |
| 33 | 10.21.66.0/28 | 10.21.66.1 – 10.21.66.14 | 10.21.66.15 |
| 34 | 10.21.66.16/28 | 10.21.66.17 – 10.21.66.30 | 10.21.66.31 |
| 35 | 10.21.66.32/28 | 10.21.66.33 – 10.21.66.46 | 10.21.66.47 |
| 36 | 10.21.66.48/28 | 10.21.66.49 – 10.21.66.62 | 10.21.66.63 |
| 37 | 10.21.66.64/28 | 10.21.66.65 – 10.21.66.78 | 10.21.66.79 |
| 38 | 10.21.66.80/28 | 10.21.66.81 – 10.21.66.94 | 10.21.66.95 |
| 39 | 10.21.66.96/28 | 10.21.66.97 – 10.21.66.110 | 10.21.66.111 |
| 40 | 10.21.66.112/28 | 10.21.66.113 – 10.21.66.126 | 10.21.66.127 |
| 41 | 10.21.66.128/28 | 10.21.66.129 – 10.21.66.142 | 10.21.66.143 |
| 42 | 10.21.66.144/28 | 10.21.66.145 – 10.21.66.158 | 10.21.66.159 |
| 43 | 10.21.66.160/28 | 10.21.66.161 – 10.21.66.174 | 10.21.66.175 |
| 44 | 10.21.66.176/28 | 10.21.66.177 – 10.21.66.190 | 10.21.66.191 |
| 45 | 10.21.66.192/28 | 10.21.66.193 – 10.21.66.206 | 10.21.66.207 |
| 46 | 10.21.66.208/28 | 10.21.66.209 – 10.21.66.222 | 10.21.66.223 |
| 47 | 10.21.66.224/28 | 10.21.66.225 – 10.21.66.238 | 10.21.66.239 |
| 48 | 10.21.66.240/28 | 10.21.66.241 – 10.21.66.254 | 10.21.66.255 |
| 49 | 10.21.67.0/28 | 10.21.67.1 – 10.21.67.14 | 10.21.67.15 |
| 50 | 10.21.67.16/28 | 10.21.67.17 – 10.21.67.30 | 10.21.67.31 |
| 51 | 10.21.67.32/28 | 10.21.67.33 – 10.21.67.46 | 10.21.67.47 |
| 52 | 10.21.67.48/28 | 10.21.67.49 – 10.21.67.62 | 10.21.67.63 |
| 53 | 10.21.67.64/28 | 10.21.67.65 – 10.21.67.78 | 10.21.67.79 |
| 54 | 10.21.67.80/28 | 10.21.67.81 – 10.21.67.94 | 10.21.67.95 |
| 55 | 10.21.67.96/28 | 10.21.67.97 – 10.21.67.110 | 10.21.67.111 |
| 56 | 10.21.67.112/28 | 10.21.67.113 – 10.21.67.126 | 10.21.67.127 |
| 57 | 10.21.67.128/28 | 10.21.67.129 – 10.21.67.142 | 10.21.67.143 |
| 58 | 10.21.67.144/28 | 10.21.67.145 – 10.21.67.158 | 10.21.67.159 |
| 59 | 10.21.67.160/28 | 10.21.67.161 – 10.21.67.174 | 10.21.67.175 |
| 60 | 10.21.67.176/28 | 10.21.67.177 – 10.21.67.190 | 10.21.67.191 |
| 61 | 10.21.67.192/28 | 10.21.67.193 – 10.21.67.206 | 10.21.67.207 |
| 62 | 10.21.67.208/28 | 10.21.67.209 – 10.21.67.222 | 10.21.67.223 |
| 63 | 10.21.67.224/28 | 10.21.67.225 – 10.21.67.238 | 10.21.67.239 |
| 64 | 10.21.67.240/28 | 10.21.67.241 – 10.21.67.254 | 10.21.67.255 |
| 65 | 10.21.68.0/28 | 10.21.68.1 – 10.21.68.14 | 10.21.68.15 |
| 66 | 10.21.68.16/28 | 10.21.68.17 – 10.21.68.30 | 10.21.68.31 |
| 67 | 10.21.68.32/28 | 10.21.68.33 – 10.21.68.46 | 10.21.68.47 |
| 68 | 10.21.68.48/28 | 10.21.68.49 – 10.21.68.62 | 10.21.68.63 |
| 69 | 10.21.68.64/28 | 10.21.68.65 – 10.21.68.78 | 10.21.68.79 |
| 70 | 10.21.68.80/28 | 10.21.68.81 – 10.21.68.94 | 10.21.68.95 |
| 71 | 10.21.68.96/28 | 10.21.68.97 – 10.21.68.110 | 10.21.68.111 |
| 72 | 10.21.68.112/28 | 10.21.68.113 – 10.21.68.126 | 10.21.68.127 |
| 73 | 10.21.68.128/28 | 10.21.68.129 – 10.21.68.142 | 10.21.68.143 |
| 74 | 10.21.68.144/28 | 10.21.68.145 – 10.21.68.158 | 10.21.68.159 |
| 75 | 10.21.68.160/28 | 10.21.68.161 – 10.21.68.174 | 10.21.68.175 |
| 76 | 10.21.68.176/28 | 10.21.68.177 – 10.21.68.190 | 10.21.68.191 |
| 77 | 10.21.68.192/28 | 10.21.68.193 – 10.21.68.206 | 10.21.68.207 |
| 78 | 10.21.68.208/28 | 10.21.68.209 – 10.21.68.222 | 10.21.68.223 |
| 79 | 10.21.68.224/28 | 10.21.68.225 – 10.21.68.238 | 10.21.68.239 |
| 80 | 10.21.68.240/28 | 10.21.68.241 – 10.21.68.254 | 10.21.68.255 |
| 81 | 10.21.69.0/28 | 10.21.69.1 – 10.21.69.14 | 10.21.69.15 |
| 82 | 10.21.69.16/28 | 10.21.69.17 – 10.21.69.30 | 10.21.69.31 |
| 83 | 10.21.69.32/28 | 10.21.69.33 – 10.21.69.46 | 10.21.69.47 |
| 84 | 10.21.69.48/28 | 10.21.69.49 – 10.21.69.62 | 10.21.69.63 |
| 85 | 10.21.69.64/28 | 10.21.69.65 – 10.21.69.78 | 10.21.69.79 |
| 86 | 10.21.69.80/28 | 10.21.69.81 – 10.21.69.94 | 10.21.69.95 |
| 87 | 10.21.69.96/28 | 10.21.69.97 – 10.21.69.110 | 10.21.69.111 |
| 88 | 10.21.69.112/28 | 10.21.69.113 – 10.21.69.126 | 10.21.69.127 |
| 89 | 10.21.69.128/28 | 10.21.69.129 – 10.21.69.142 | 10.21.69.143 |
| 90 | 10.21.69.144/28 | 10.21.69.145 – 10.21.69.158 | 10.21.69.159 |
| 91 | 10.21.69.160/28 | 10.21.69.161 – 10.21.69.174 | 10.21.69.175 |
| 92 | 10.21.69.176/28 | 10.21.69.177 – 10.21.69.190 | 10.21.69.191 |
| 93 | 10.21.69.192/28 | 10.21.69.193 – 10.21.69.206 | 10.21.69.207 |
| 94 | 10.21.69.208/28 | 10.21.69.209 – 10.21.69.222 | 10.21.69.223 |
| 95 | 10.21.69.224/28 | 10.21.69.225 – 10.21.69.238 | 10.21.69.239 |
| 96 | 10.21.69.240/28 | 10.21.69.241 – 10.21.69.254 | 10.21.69.255 |
| 97 | 10.21.70.0/28 | 10.21.70.1 – 10.21.70.14 | 10.21.70.15 |
| 98 | 10.21.70.16/28 | 10.21.70.17 – 10.21.70.30 | 10.21.70.31 |
| 99 | 10.21.70.32/28 | 10.21.70.33 – 10.21.70.46 | 10.21.70.47 |
| 100 | 10.21.70.48/28 | 10.21.70.49 – 10.21.70.62 | 10.21.70.63 |
| 101 | 10.21.70.64/28 | 10.21.70.65 – 10.21.70.78 | 10.21.70.79 |
| 102 | 10.21.70.80/28 | 10.21.70.81 – 10.21.70.94 | 10.21.70.95 |
| 103 | 10.21.70.96/28 | 10.21.70.97 – 10.21.70.110 | 10.21.70.111 |
| 104 | 10.21.70.112/28 | 10.21.70.113 – 10.21.70.126 | 10.21.70.127 |
| 105 | 10.21.70.128/28 | 10.21.70.129 – 10.21.70.142 | 10.21.70.143 |
| 106 | 10.21.70.144/28 | 10.21.70.145 – 10.21.70.158 | 10.21.70.159 |
| 107 | 10.21.70.160/28 | 10.21.70.161 – 10.21.70.174 | 10.21.70.175 |
| 108 | 10.21.70.176/28 | 10.21.70.177 – 10.21.70.190 | 10.21.70.191 |
| 109 | 10.21.70.192/28 | 10.21.70.193 – 10.21.70.206 | 10.21.70.207 |
| 110 | 10.21.70.208/28 | 10.21.70.209 – 10.21.70.222 | 10.21.70.223 |
| 111 | 10.21.70.224/28 | 10.21.70.225 – 10.21.70.238 | 10.21.70.239 |
| 112 | 10.21.70.240/28 | 10.21.70.241 – 10.21.70.254 | 10.21.70.255 |
| 113 | 10.21.71.0/28 | 10.21.71.1 – 10.21.71.14 | 10.21.71.15 |
| 114 | 10.21.71.16/28 | 10.21.71.17 – 10.21.71.30 | 10.21.71.31 |
| 115 | 10.21.71.32/28 | 10.21.71.33 – 10.21.71.46 | 10.21.71.47 |
| 116 | 10.21.71.48/28 | 10.21.71.49 – 10.21.71.62 | 10.21.71.63 |
| 117 | 10.21.71.64/28 | 10.21.71.65 – 10.21.71.78 | 10.21.71.79 |
| 118 | 10.21.71.80/28 | 10.21.71.81 – 10.21.71.94 | 10.21.71.95 |
| 119 | 10.21.71.96/28 | 10.21.71.97 – 10.21.71.110 | 10.21.71.111 |
| 120 | 10.21.71.112/28 | 10.21.71.113 – 10.21.71.126 | 10.21.71.127 |
| 121 | 10.21.71.128/28 | 10.21.71.129 – 10.21.71.142 | 10.21.71.143 |
| 122 | 10.21.71.144/28 | 10.21.71.145 – 10.21.71.158 | 10.21.71.159 |
| 123 | 10.21.71.160/28 | 10.21.71.161 – 10.21.71.174 | 10.21.71.175 |
| 124 | 10.21.71.176/28 | 10.21.71.177 – 10.21.71.190 | 10.21.71.191 |
| 125 | 10.21.71.192/28 | 10.21.71.193 – 10.21.71.206 | 10.21.71.207 |
| 126 | 10.21.71.208/28 | 10.21.71.209 – 10.21.71.222 | 10.21.71.223 |
| 127 | 10.21.71.224/28 | 10.21.71.225 – 10.21.71.238 | 10.21.71.239 |
| 128 | 10.21.71.240/28 | 10.21.71.241 – 10.21.71.254 | 10.21.71.255 |
| 129 | 10.21.72.0/28 | 10.21.72.1 – 10.21.72.14 | 10.21.72.15 |
| 130 | 10.21.72.16/28 | 10.21.72.17 – 10.21.72.30 | 10.21.72.31 |
| 131 | 10.21.72.32/28 | 10.21.72.33 – 10.21.72.46 | 10.21.72.47 |
| 132 | 10.21.72.48/28 | 10.21.72.49 – 10.21.72.62 | 10.21.72.63 |
| 133 | 10.21.72.64/28 | 10.21.72.65 – 10.21.72.78 | 10.21.72.79 |
| 134 | 10.21.72.80/28 | 10.21.72.81 – 10.21.72.94 | 10.21.72.95 |
| 135 | 10.21.72.96/28 | 10.21.72.97 – 10.21.72.110 | 10.21.72.111 |
| 136 | 10.21.72.112/28 | 10.21.72.113 – 10.21.72.126 | 10.21.72.127 |
| 137 | 10.21.72.128/28 | 10.21.72.129 – 10.21.72.142 | 10.21.72.143 |
| 138 | 10.21.72.144/28 | 10.21.72.145 – 10.21.72.158 | 10.21.72.159 |
| 139 | 10.21.72.160/28 | 10.21.72.161 – 10.21.72.174 | 10.21.72.175 |
| 140 | 10.21.72.176/28 | 10.21.72.177 – 10.21.72.190 | 10.21.72.191 |
| 141 | 10.21.72.192/28 | 10.21.72.193 – 10.21.72.206 | 10.21.72.207 |
| 142 | 10.21.72.208/28 | 10.21.72.209 – 10.21.72.222 | 10.21.72.223 |
| 143 | 10.21.72.224/28 | 10.21.72.225 – 10.21.72.238 | 10.21.72.239 |
| 144 | 10.21.72.240/28 | 10.21.72.241 – 10.21.72.254 | 10.21.72.255 |
| 145 | 10.21.73.0/28 | 10.21.73.1 – 10.21.73.14 | 10.21.73.15 |
| 146 | 10.21.73.16/28 | 10.21.73.17 – 10.21.73.30 | 10.21.73.31 |
| 147 | 10.21.73.32/28 | 10.21.73.33 – 10.21.73.46 | 10.21.73.47 |
| 148 | 10.21.73.48/28 | 10.21.73.49 – 10.21.73.62 | 10.21.73.63 |
| 149 | 10.21.73.64/28 | 10.21.73.65 – 10.21.73.78 | 10.21.73.79 |
| 150 | 10.21.73.80/28 | 10.21.73.81 – 10.21.73.94 | 10.21.73.95 |
| 151 | 10.21.73.96/28 | 10.21.73.97 – 10.21.73.110 | 10.21.73.111 |
| 152 | 10.21.73.112/28 | 10.21.73.113 – 10.21.73.126 | 10.21.73.127 |
| 153 | 10.21.73.128/28 | 10.21.73.129 – 10.21.73.142 | 10.21.73.143 |
| 154 | 10.21.73.144/28 | 10.21.73.145 – 10.21.73.158 | 10.21.73.159 |
| 155 | 10.21.73.160/28 | 10.21.73.161 – 10.21.73.174 | 10.21.73.175 |
| 156 | 10.21.73.176/28 | 10.21.73.177 – 10.21.73.190 | 10.21.73.191 |
| 157 | 10.21.73.192/28 | 10.21.73.193 – 10.21.73.206 | 10.21.73.207 |
| 158 | 10.21.73.208/28 | 10.21.73.209 – 10.21.73.222 | 10.21.73.223 |
| 159 | 10.21.73.224/28 | 10.21.73.225 – 10.21.73.238 | 10.21.73.239 |
| 160 | 10.21.73.240/28 | 10.21.73.241 – 10.21.73.254 | 10.21.73.255 |
| 161 | 10.21.74.0/28 | 10.21.74.1 – 10.21.74.14 | 10.21.74.15 |
| 162 | 10.21.74.16/28 | 10.21.74.17 – 10.21.74.30 | 10.21.74.31 |
| 163 | 10.21.74.32/28 | 10.21.74.33 – 10.21.74.46 | 10.21.74.47 |
| 164 | 10.21.74.48/28 | 10.21.74.49 – 10.21.74.62 | 10.21.74.63 |
| 165 | 10.21.74.64/28 | 10.21.74.65 – 10.21.74.78 | 10.21.74.79 |
| 166 | 10.21.74.80/28 | 10.21.74.81 – 10.21.74.94 | 10.21.74.95 |
| 167 | 10.21.74.96/28 | 10.21.74.97 – 10.21.74.110 | 10.21.74.111 |
| 168 | 10.21.74.112/28 | 10.21.74.113 – 10.21.74.126 | 10.21.74.127 |
| 169 | 10.21.74.128/28 | 10.21.74.129 – 10.21.74.142 | 10.21.74.143 |
| 170 | 10.21.74.144/28 | 10.21.74.145 – 10.21.74.158 | 10.21.74.159 |
| 171 | 10.21.74.160/28 | 10.21.74.161 – 10.21.74.174 | 10.21.74.175 |
| 172 | 10.21.74.176/28 | 10.21.74.177 – 10.21.74.190 | 10.21.74.191 |
| 173 | 10.21.74.192/28 | 10.21.74.193 – 10.21.74.206 | 10.21.74.207 |
| 174 | 10.21.74.208/28 | 10.21.74.209 – 10.21.74.222 | 10.21.74.223 |
| 175 | 10.21.74.224/28 | 10.21.74.225 – 10.21.74.238 | 10.21.74.239 |
| 176 | 10.21.74.240/28 | 10.21.74.241 – 10.21.74.254 | 10.21.74.255 |
| 177 | 10.21.75.0/28 | 10.21.75.1 – 10.21.75.14 | 10.21.75.15 |
| 178 | 10.21.75.16/28 | 10.21.75.17 – 10.21.75.30 | 10.21.75.31 |
| 179 | 10.21.75.32/28 | 10.21.75.33 – 10.21.75.46 | 10.21.75.47 |
| 180 | 10.21.75.48/28 | 10.21.75.49 – 10.21.75.62 | 10.21.75.63 |
| 181 | 10.21.75.64/28 | 10.21.75.65 – 10.21.75.78 | 10.21.75.79 |
| 182 | 10.21.75.80/28 | 10.21.75.81 – 10.21.75.94 | 10.21.75.95 |
| 183 | 10.21.75.96/28 | 10.21.75.97 – 10.21.75.110 | 10.21.75.111 |
| 184 | 10.21.75.112/28 | 10.21.75.113 – 10.21.75.126 | 10.21.75.127 |
| 185 | 10.21.75.128/28 | 10.21.75.129 – 10.21.75.142 | 10.21.75.143 |
| 186 | 10.21.75.144/28 | 10.21.75.145 – 10.21.75.158 | 10.21.75.159 |
| 187 | 10.21.75.160/28 | 10.21.75.161 – 10.21.75.174 | 10.21.75.175 |
| 188 | 10.21.75.176/28 | 10.21.75.177 – 10.21.75.190 | 10.21.75.191 |
| 189 | 10.21.75.192/28 | 10.21.75.193 – 10.21.75.206 | 10.21.75.207 |
| 190 | 10.21.75.208/28 | 10.21.75.209 – 10.21.75.222 | 10.21.75.223 |
| 191 | 10.21.75.224/28 | 10.21.75.225 – 10.21.75.238 | 10.21.75.239 |
| 192 | 10.21.75.240/28 | 10.21.75.241 – 10.21.75.254 | 10.21.75.255 |
| 193 | 10.21.76.0/28 | 10.21.76.1 – 10.21.76.14 | 10.21.76.15 |
| 194 | 10.21.76.16/28 | 10.21.76.17 – 10.21.76.30 | 10.21.76.31 |
| 195 | 10.21.76.32/28 | 10.21.76.33 – 10.21.76.46 | 10.21.76.47 |
| 196 | 10.21.76.48/28 | 10.21.76.49 – 10.21.76.62 | 10.21.76.63 |
| 197 | 10.21.76.64/28 | 10.21.76.65 – 10.21.76.78 | 10.21.76.79 |
| 198 | 10.21.76.80/28 | 10.21.76.81 – 10.21.76.94 | 10.21.76.95 |
| 199 | 10.21.76.96/28 | 10.21.76.97 – 10.21.76.110 | 10.21.76.111 |
| 200 | 10.21.76.112/28 | 10.21.76.113 – 10.21.76.126 | 10.21.76.127 |
| 201 | 10.21.76.128/28 | 10.21.76.129 – 10.21.76.142 | 10.21.76.143 |
| 202 | 10.21.76.144/28 | 10.21.76.145 – 10.21.76.158 | 10.21.76.159 |
| 203 | 10.21.76.160/28 | 10.21.76.161 – 10.21.76.174 | 10.21.76.175 |
| 204 | 10.21.76.176/28 | 10.21.76.177 – 10.21.76.190 | 10.21.76.191 |
| 205 | 10.21.76.192/28 | 10.21.76.193 – 10.21.76.206 | 10.21.76.207 |
| 206 | 10.21.76.208/28 | 10.21.76.209 – 10.21.76.222 | 10.21.76.223 |
| 207 | 10.21.76.224/28 | 10.21.76.225 – 10.21.76.238 | 10.21.76.239 |
| 208 | 10.21.76.240/28 | 10.21.76.241 – 10.21.76.254 | 10.21.76.255 |
| 209 | 10.21.77.0/28 | 10.21.77.1 – 10.21.77.14 | 10.21.77.15 |
| 210 | 10.21.77.16/28 | 10.21.77.17 – 10.21.77.30 | 10.21.77.31 |
| 211 | 10.21.77.32/28 | 10.21.77.33 – 10.21.77.46 | 10.21.77.47 |
| 212 | 10.21.77.48/28 | 10.21.77.49 – 10.21.77.62 | 10.21.77.63 |
| 213 | 10.21.77.64/28 | 10.21.77.65 – 10.21.77.78 | 10.21.77.79 |
| 214 | 10.21.77.80/28 | 10.21.77.81 – 10.21.77.94 | 10.21.77.95 |
| 215 | 10.21.77.96/28 | 10.21.77.97 – 10.21.77.110 | 10.21.77.111 |
| 216 | 10.21.77.112/28 | 10.21.77.113 – 10.21.77.126 | 10.21.77.127 |
| 217 | 10.21.77.128/28 | 10.21.77.129 – 10.21.77.142 | 10.21.77.143 |
| 218 | 10.21.77.144/28 | 10.21.77.145 – 10.21.77.158 | 10.21.77.159 |
| 219 | 10.21.77.160/28 | 10.21.77.161 – 10.21.77.174 | 10.21.77.175 |
| 220 | 10.21.77.176/28 | 10.21.77.177 – 10.21.77.190 | 10.21.77.191 |
| 221 | 10.21.77.192/28 | 10.21.77.193 – 10.21.77.206 | 10.21.77.207 |
| 222 | 10.21.77.208/28 | 10.21.77.209 – 10.21.77.222 | 10.21.77.223 |
| 223 | 10.21.77.224/28 | 10.21.77.225 – 10.21.77.238 | 10.21.77.239 |
| 224 | 10.21.77.240/28 | 10.21.77.241 – 10.21.77.254 | 10.21.77.255 |
| 225 | 10.21.78.0/28 | 10.21.78.1 – 10.21.78.14 | 10.21.78.15 |
| 226 | 10.21.78.16/28 | 10.21.78.17 – 10.21.78.30 | 10.21.78.31 |
| 227 | 10.21.78.32/28 | 10.21.78.33 – 10.21.78.46 | 10.21.78.47 |
| 228 | 10.21.78.48/28 | 10.21.78.49 – 10.21.78.62 | 10.21.78.63 |
| 229 | 10.21.78.64/28 | 10.21.78.65 – 10.21.78.78 | 10.21.78.79 |
| 230 | 10.21.78.80/28 | 10.21.78.81 – 10.21.78.94 | 10.21.78.95 |
| 231 | 10.21.78.96/28 | 10.21.78.97 – 10.21.78.110 | 10.21.78.111 |
| 232 | 10.21.78.112/28 | 10.21.78.113 – 10.21.78.126 | 10.21.78.127 |
| 233 | 10.21.78.128/28 | 10.21.78.129 – 10.21.78.142 | 10.21.78.143 |
| 234 | 10.21.78.144/28 | 10.21.78.145 – 10.21.78.158 | 10.21.78.159 |
| 235 | 10.21.78.160/28 | 10.21.78.161 – 10.21.78.174 | 10.21.78.175 |
| 236 | 10.21.78.176/28 | 10.21.78.177 – 10.21.78.190 | 10.21.78.191 |
| 237 | 10.21.78.192/28 | 10.21.78.193 – 10.21.78.206 | 10.21.78.207 |
| 238 | 10.21.78.208/28 | 10.21.78.209 – 10.21.78.222 | 10.21.78.223 |
| 239 | 10.21.78.224/28 | 10.21.78.225 – 10.21.78.238 | 10.21.78.239 |
| 240 | 10.21.78.240/28 | 10.21.78.241 – 10.21.78.254 | 10.21.78.255 |
| 241 | 10.21.79.0/28 | 10.21.79.1 – 10.21.79.14 | 10.21.79.15 |
| 242 | 10.21.79.16/28 | 10.21.79.17 – 10.21.79.30 | 10.21.79.31 |
| 243 | 10.21.79.32/28 | 10.21.79.33 – 10.21.79.46 | 10.21.79.47 |
| 244 | 10.21.79.48/28 | 10.21.79.49 – 10.21.79.62 | 10.21.79.63 |
| 245 | 10.21.79.64/28 | 10.21.79.65 – 10.21.79.78 | 10.21.79.79 |
| 246 | 10.21.79.80/28 | 10.21.79.81 – 10.21.79.94 | 10.21.79.95 |
| 247 | 10.21.79.96/28 | 10.21.79.97 – 10.21.79.110 | 10.21.79.111 |
| 248 | 10.21.79.112/28 | 10.21.79.113 – 10.21.79.126 | 10.21.79.127 |
| 249 | 10.21.79.128/28 | 10.21.79.129 – 10.21.79.142 | 10.21.79.143 |
| 250 | 10.21.79.144/28 | 10.21.79.145 – 10.21.79.158 | 10.21.79.159 |
| 251 | 10.21.79.160/28 | 10.21.79.161 – 10.21.79.174 | 10.21.79.175 |
| 252 | 10.21.79.176/28 | 10.21.79.177 – 10.21.79.190 | 10.21.79.191 |
| 253 | 10.21.79.192/28 | 10.21.79.193 – 10.21.79.206 | 10.21.79.207 |
| 254 | 10.21.79.208/28 | 10.21.79.209 – 10.21.79.222 | 10.21.79.223 |
| 255 | 10.21.79.224/28 | 10.21.79.225 – 10.21.79.238 | 10.21.79.239 |
| 256 | 10.21.79.240/28 | 10.21.79.241 – 10.21.79.254 | 10.21.79.255 |
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 /19 |
|---|---|---|---|---|
| /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 | 1 |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 2 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 4 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 8 split → |
| /23 | 255.255.254.0 | 512 | 510 | 16 split → |
| /24 | 255.255.255.0 | 256 | 254 | 32 split → |
| /25 | 255.255.255.128 | 128 | 126 | 64 split → |
| /26 | 255.255.255.192 | 64 | 62 | 128 split → |
| /27 | 255.255.255.224 | 32 | 30 | 256 split → |
| /28 | 255.255.255.240 | 16 | 14 | 512 split → |
| /29 | 255.255.255.248 | 8 | 6 | 1,024 split → |
| /30 | 255.255.255.252 | 4 | 2 | 2,048 split → |
| /31 | 255.255.255.254 | 2 | 2 | 4,096 split → |
| /32 | 255.255.255.255 | 1 | 1 | 8,192 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.