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)10.21.64.0/18
network10.21.64.0/18
broadcast10.21.127.255
first host10.21.64.1
last host10.21.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.21.64.0/18
address00001010.00010101.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010101.01000000.00000000
broadcast00001010.00010101.01111111.11111111
green = network part, grey = host part
hex0x0a154000
decimal169164800
reverse dns0.64.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:4000
/18 split into /30 · 4,096 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.64.0/30 | 10.21.64.1 – 10.21.64.2 | 10.21.64.3 |
| 2 | 10.21.64.4/30 | 10.21.64.5 – 10.21.64.6 | 10.21.64.7 |
| 3 | 10.21.64.8/30 | 10.21.64.9 – 10.21.64.10 | 10.21.64.11 |
| 4 | 10.21.64.12/30 | 10.21.64.13 – 10.21.64.14 | 10.21.64.15 |
| 5 | 10.21.64.16/30 | 10.21.64.17 – 10.21.64.18 | 10.21.64.19 |
| 6 | 10.21.64.20/30 | 10.21.64.21 – 10.21.64.22 | 10.21.64.23 |
| 7 | 10.21.64.24/30 | 10.21.64.25 – 10.21.64.26 | 10.21.64.27 |
| 8 | 10.21.64.28/30 | 10.21.64.29 – 10.21.64.30 | 10.21.64.31 |
| 9 | 10.21.64.32/30 | 10.21.64.33 – 10.21.64.34 | 10.21.64.35 |
| 10 | 10.21.64.36/30 | 10.21.64.37 – 10.21.64.38 | 10.21.64.39 |
| 11 | 10.21.64.40/30 | 10.21.64.41 – 10.21.64.42 | 10.21.64.43 |
| 12 | 10.21.64.44/30 | 10.21.64.45 – 10.21.64.46 | 10.21.64.47 |
| 13 | 10.21.64.48/30 | 10.21.64.49 – 10.21.64.50 | 10.21.64.51 |
| 14 | 10.21.64.52/30 | 10.21.64.53 – 10.21.64.54 | 10.21.64.55 |
| 15 | 10.21.64.56/30 | 10.21.64.57 – 10.21.64.58 | 10.21.64.59 |
| 16 | 10.21.64.60/30 | 10.21.64.61 – 10.21.64.62 | 10.21.64.63 |
| 17 | 10.21.64.64/30 | 10.21.64.65 – 10.21.64.66 | 10.21.64.67 |
| 18 | 10.21.64.68/30 | 10.21.64.69 – 10.21.64.70 | 10.21.64.71 |
| 19 | 10.21.64.72/30 | 10.21.64.73 – 10.21.64.74 | 10.21.64.75 |
| 20 | 10.21.64.76/30 | 10.21.64.77 – 10.21.64.78 | 10.21.64.79 |
| 21 | 10.21.64.80/30 | 10.21.64.81 – 10.21.64.82 | 10.21.64.83 |
| 22 | 10.21.64.84/30 | 10.21.64.85 – 10.21.64.86 | 10.21.64.87 |
| 23 | 10.21.64.88/30 | 10.21.64.89 – 10.21.64.90 | 10.21.64.91 |
| 24 | 10.21.64.92/30 | 10.21.64.93 – 10.21.64.94 | 10.21.64.95 |
| 25 | 10.21.64.96/30 | 10.21.64.97 – 10.21.64.98 | 10.21.64.99 |
| 26 | 10.21.64.100/30 | 10.21.64.101 – 10.21.64.102 | 10.21.64.103 |
| 27 | 10.21.64.104/30 | 10.21.64.105 – 10.21.64.106 | 10.21.64.107 |
| 28 | 10.21.64.108/30 | 10.21.64.109 – 10.21.64.110 | 10.21.64.111 |
| 29 | 10.21.64.112/30 | 10.21.64.113 – 10.21.64.114 | 10.21.64.115 |
| 30 | 10.21.64.116/30 | 10.21.64.117 – 10.21.64.118 | 10.21.64.119 |
| 31 | 10.21.64.120/30 | 10.21.64.121 – 10.21.64.122 | 10.21.64.123 |
| 32 | 10.21.64.124/30 | 10.21.64.125 – 10.21.64.126 | 10.21.64.127 |
| 33 | 10.21.64.128/30 | 10.21.64.129 – 10.21.64.130 | 10.21.64.131 |
| 34 | 10.21.64.132/30 | 10.21.64.133 – 10.21.64.134 | 10.21.64.135 |
| 35 | 10.21.64.136/30 | 10.21.64.137 – 10.21.64.138 | 10.21.64.139 |
| 36 | 10.21.64.140/30 | 10.21.64.141 – 10.21.64.142 | 10.21.64.143 |
| 37 | 10.21.64.144/30 | 10.21.64.145 – 10.21.64.146 | 10.21.64.147 |
| 38 | 10.21.64.148/30 | 10.21.64.149 – 10.21.64.150 | 10.21.64.151 |
| 39 | 10.21.64.152/30 | 10.21.64.153 – 10.21.64.154 | 10.21.64.155 |
| 40 | 10.21.64.156/30 | 10.21.64.157 – 10.21.64.158 | 10.21.64.159 |
| 41 | 10.21.64.160/30 | 10.21.64.161 – 10.21.64.162 | 10.21.64.163 |
| 42 | 10.21.64.164/30 | 10.21.64.165 – 10.21.64.166 | 10.21.64.167 |
| 43 | 10.21.64.168/30 | 10.21.64.169 – 10.21.64.170 | 10.21.64.171 |
| 44 | 10.21.64.172/30 | 10.21.64.173 – 10.21.64.174 | 10.21.64.175 |
| 45 | 10.21.64.176/30 | 10.21.64.177 – 10.21.64.178 | 10.21.64.179 |
| 46 | 10.21.64.180/30 | 10.21.64.181 – 10.21.64.182 | 10.21.64.183 |
| 47 | 10.21.64.184/30 | 10.21.64.185 – 10.21.64.186 | 10.21.64.187 |
| 48 | 10.21.64.188/30 | 10.21.64.189 – 10.21.64.190 | 10.21.64.191 |
| 49 | 10.21.64.192/30 | 10.21.64.193 – 10.21.64.194 | 10.21.64.195 |
| 50 | 10.21.64.196/30 | 10.21.64.197 – 10.21.64.198 | 10.21.64.199 |
| 51 | 10.21.64.200/30 | 10.21.64.201 – 10.21.64.202 | 10.21.64.203 |
| 52 | 10.21.64.204/30 | 10.21.64.205 – 10.21.64.206 | 10.21.64.207 |
| 53 | 10.21.64.208/30 | 10.21.64.209 – 10.21.64.210 | 10.21.64.211 |
| 54 | 10.21.64.212/30 | 10.21.64.213 – 10.21.64.214 | 10.21.64.215 |
| 55 | 10.21.64.216/30 | 10.21.64.217 – 10.21.64.218 | 10.21.64.219 |
| 56 | 10.21.64.220/30 | 10.21.64.221 – 10.21.64.222 | 10.21.64.223 |
| 57 | 10.21.64.224/30 | 10.21.64.225 – 10.21.64.226 | 10.21.64.227 |
| 58 | 10.21.64.228/30 | 10.21.64.229 – 10.21.64.230 | 10.21.64.231 |
| 59 | 10.21.64.232/30 | 10.21.64.233 – 10.21.64.234 | 10.21.64.235 |
| 60 | 10.21.64.236/30 | 10.21.64.237 – 10.21.64.238 | 10.21.64.239 |
| 61 | 10.21.64.240/30 | 10.21.64.241 – 10.21.64.242 | 10.21.64.243 |
| 62 | 10.21.64.244/30 | 10.21.64.245 – 10.21.64.246 | 10.21.64.247 |
| 63 | 10.21.64.248/30 | 10.21.64.249 – 10.21.64.250 | 10.21.64.251 |
| 64 | 10.21.64.252/30 | 10.21.64.253 – 10.21.64.254 | 10.21.64.255 |
| 65 | 10.21.65.0/30 | 10.21.65.1 – 10.21.65.2 | 10.21.65.3 |
| 66 | 10.21.65.4/30 | 10.21.65.5 – 10.21.65.6 | 10.21.65.7 |
| 67 | 10.21.65.8/30 | 10.21.65.9 – 10.21.65.10 | 10.21.65.11 |
| 68 | 10.21.65.12/30 | 10.21.65.13 – 10.21.65.14 | 10.21.65.15 |
| 69 | 10.21.65.16/30 | 10.21.65.17 – 10.21.65.18 | 10.21.65.19 |
| 70 | 10.21.65.20/30 | 10.21.65.21 – 10.21.65.22 | 10.21.65.23 |
| 71 | 10.21.65.24/30 | 10.21.65.25 – 10.21.65.26 | 10.21.65.27 |
| 72 | 10.21.65.28/30 | 10.21.65.29 – 10.21.65.30 | 10.21.65.31 |
| 73 | 10.21.65.32/30 | 10.21.65.33 – 10.21.65.34 | 10.21.65.35 |
| 74 | 10.21.65.36/30 | 10.21.65.37 – 10.21.65.38 | 10.21.65.39 |
| 75 | 10.21.65.40/30 | 10.21.65.41 – 10.21.65.42 | 10.21.65.43 |
| 76 | 10.21.65.44/30 | 10.21.65.45 – 10.21.65.46 | 10.21.65.47 |
| 77 | 10.21.65.48/30 | 10.21.65.49 – 10.21.65.50 | 10.21.65.51 |
| 78 | 10.21.65.52/30 | 10.21.65.53 – 10.21.65.54 | 10.21.65.55 |
| 79 | 10.21.65.56/30 | 10.21.65.57 – 10.21.65.58 | 10.21.65.59 |
| 80 | 10.21.65.60/30 | 10.21.65.61 – 10.21.65.62 | 10.21.65.63 |
| 81 | 10.21.65.64/30 | 10.21.65.65 – 10.21.65.66 | 10.21.65.67 |
| 82 | 10.21.65.68/30 | 10.21.65.69 – 10.21.65.70 | 10.21.65.71 |
| 83 | 10.21.65.72/30 | 10.21.65.73 – 10.21.65.74 | 10.21.65.75 |
| 84 | 10.21.65.76/30 | 10.21.65.77 – 10.21.65.78 | 10.21.65.79 |
| 85 | 10.21.65.80/30 | 10.21.65.81 – 10.21.65.82 | 10.21.65.83 |
| 86 | 10.21.65.84/30 | 10.21.65.85 – 10.21.65.86 | 10.21.65.87 |
| 87 | 10.21.65.88/30 | 10.21.65.89 – 10.21.65.90 | 10.21.65.91 |
| 88 | 10.21.65.92/30 | 10.21.65.93 – 10.21.65.94 | 10.21.65.95 |
| 89 | 10.21.65.96/30 | 10.21.65.97 – 10.21.65.98 | 10.21.65.99 |
| 90 | 10.21.65.100/30 | 10.21.65.101 – 10.21.65.102 | 10.21.65.103 |
| 91 | 10.21.65.104/30 | 10.21.65.105 – 10.21.65.106 | 10.21.65.107 |
| 92 | 10.21.65.108/30 | 10.21.65.109 – 10.21.65.110 | 10.21.65.111 |
| 93 | 10.21.65.112/30 | 10.21.65.113 – 10.21.65.114 | 10.21.65.115 |
| 94 | 10.21.65.116/30 | 10.21.65.117 – 10.21.65.118 | 10.21.65.119 |
| 95 | 10.21.65.120/30 | 10.21.65.121 – 10.21.65.122 | 10.21.65.123 |
| 96 | 10.21.65.124/30 | 10.21.65.125 – 10.21.65.126 | 10.21.65.127 |
| 97 | 10.21.65.128/30 | 10.21.65.129 – 10.21.65.130 | 10.21.65.131 |
| 98 | 10.21.65.132/30 | 10.21.65.133 – 10.21.65.134 | 10.21.65.135 |
| 99 | 10.21.65.136/30 | 10.21.65.137 – 10.21.65.138 | 10.21.65.139 |
| 100 | 10.21.65.140/30 | 10.21.65.141 – 10.21.65.142 | 10.21.65.143 |
| 101 | 10.21.65.144/30 | 10.21.65.145 – 10.21.65.146 | 10.21.65.147 |
| 102 | 10.21.65.148/30 | 10.21.65.149 – 10.21.65.150 | 10.21.65.151 |
| 103 | 10.21.65.152/30 | 10.21.65.153 – 10.21.65.154 | 10.21.65.155 |
| 104 | 10.21.65.156/30 | 10.21.65.157 – 10.21.65.158 | 10.21.65.159 |
| 105 | 10.21.65.160/30 | 10.21.65.161 – 10.21.65.162 | 10.21.65.163 |
| 106 | 10.21.65.164/30 | 10.21.65.165 – 10.21.65.166 | 10.21.65.167 |
| 107 | 10.21.65.168/30 | 10.21.65.169 – 10.21.65.170 | 10.21.65.171 |
| 108 | 10.21.65.172/30 | 10.21.65.173 – 10.21.65.174 | 10.21.65.175 |
| 109 | 10.21.65.176/30 | 10.21.65.177 – 10.21.65.178 | 10.21.65.179 |
| 110 | 10.21.65.180/30 | 10.21.65.181 – 10.21.65.182 | 10.21.65.183 |
| 111 | 10.21.65.184/30 | 10.21.65.185 – 10.21.65.186 | 10.21.65.187 |
| 112 | 10.21.65.188/30 | 10.21.65.189 – 10.21.65.190 | 10.21.65.191 |
| 113 | 10.21.65.192/30 | 10.21.65.193 – 10.21.65.194 | 10.21.65.195 |
| 114 | 10.21.65.196/30 | 10.21.65.197 – 10.21.65.198 | 10.21.65.199 |
| 115 | 10.21.65.200/30 | 10.21.65.201 – 10.21.65.202 | 10.21.65.203 |
| 116 | 10.21.65.204/30 | 10.21.65.205 – 10.21.65.206 | 10.21.65.207 |
| 117 | 10.21.65.208/30 | 10.21.65.209 – 10.21.65.210 | 10.21.65.211 |
| 118 | 10.21.65.212/30 | 10.21.65.213 – 10.21.65.214 | 10.21.65.215 |
| 119 | 10.21.65.216/30 | 10.21.65.217 – 10.21.65.218 | 10.21.65.219 |
| 120 | 10.21.65.220/30 | 10.21.65.221 – 10.21.65.222 | 10.21.65.223 |
| 121 | 10.21.65.224/30 | 10.21.65.225 – 10.21.65.226 | 10.21.65.227 |
| 122 | 10.21.65.228/30 | 10.21.65.229 – 10.21.65.230 | 10.21.65.231 |
| 123 | 10.21.65.232/30 | 10.21.65.233 – 10.21.65.234 | 10.21.65.235 |
| 124 | 10.21.65.236/30 | 10.21.65.237 – 10.21.65.238 | 10.21.65.239 |
| 125 | 10.21.65.240/30 | 10.21.65.241 – 10.21.65.242 | 10.21.65.243 |
| 126 | 10.21.65.244/30 | 10.21.65.245 – 10.21.65.246 | 10.21.65.247 |
| 127 | 10.21.65.248/30 | 10.21.65.249 – 10.21.65.250 | 10.21.65.251 |
| 128 | 10.21.65.252/30 | 10.21.65.253 – 10.21.65.254 | 10.21.65.255 |
| 129 | 10.21.66.0/30 | 10.21.66.1 – 10.21.66.2 | 10.21.66.3 |
| 130 | 10.21.66.4/30 | 10.21.66.5 – 10.21.66.6 | 10.21.66.7 |
| 131 | 10.21.66.8/30 | 10.21.66.9 – 10.21.66.10 | 10.21.66.11 |
| 132 | 10.21.66.12/30 | 10.21.66.13 – 10.21.66.14 | 10.21.66.15 |
| 133 | 10.21.66.16/30 | 10.21.66.17 – 10.21.66.18 | 10.21.66.19 |
| 134 | 10.21.66.20/30 | 10.21.66.21 – 10.21.66.22 | 10.21.66.23 |
| 135 | 10.21.66.24/30 | 10.21.66.25 – 10.21.66.26 | 10.21.66.27 |
| 136 | 10.21.66.28/30 | 10.21.66.29 – 10.21.66.30 | 10.21.66.31 |
| 137 | 10.21.66.32/30 | 10.21.66.33 – 10.21.66.34 | 10.21.66.35 |
| 138 | 10.21.66.36/30 | 10.21.66.37 – 10.21.66.38 | 10.21.66.39 |
| 139 | 10.21.66.40/30 | 10.21.66.41 – 10.21.66.42 | 10.21.66.43 |
| 140 | 10.21.66.44/30 | 10.21.66.45 – 10.21.66.46 | 10.21.66.47 |
| 141 | 10.21.66.48/30 | 10.21.66.49 – 10.21.66.50 | 10.21.66.51 |
| 142 | 10.21.66.52/30 | 10.21.66.53 – 10.21.66.54 | 10.21.66.55 |
| 143 | 10.21.66.56/30 | 10.21.66.57 – 10.21.66.58 | 10.21.66.59 |
| 144 | 10.21.66.60/30 | 10.21.66.61 – 10.21.66.62 | 10.21.66.63 |
| 145 | 10.21.66.64/30 | 10.21.66.65 – 10.21.66.66 | 10.21.66.67 |
| 146 | 10.21.66.68/30 | 10.21.66.69 – 10.21.66.70 | 10.21.66.71 |
| 147 | 10.21.66.72/30 | 10.21.66.73 – 10.21.66.74 | 10.21.66.75 |
| 148 | 10.21.66.76/30 | 10.21.66.77 – 10.21.66.78 | 10.21.66.79 |
| 149 | 10.21.66.80/30 | 10.21.66.81 – 10.21.66.82 | 10.21.66.83 |
| 150 | 10.21.66.84/30 | 10.21.66.85 – 10.21.66.86 | 10.21.66.87 |
| 151 | 10.21.66.88/30 | 10.21.66.89 – 10.21.66.90 | 10.21.66.91 |
| 152 | 10.21.66.92/30 | 10.21.66.93 – 10.21.66.94 | 10.21.66.95 |
| 153 | 10.21.66.96/30 | 10.21.66.97 – 10.21.66.98 | 10.21.66.99 |
| 154 | 10.21.66.100/30 | 10.21.66.101 – 10.21.66.102 | 10.21.66.103 |
| 155 | 10.21.66.104/30 | 10.21.66.105 – 10.21.66.106 | 10.21.66.107 |
| 156 | 10.21.66.108/30 | 10.21.66.109 – 10.21.66.110 | 10.21.66.111 |
| 157 | 10.21.66.112/30 | 10.21.66.113 – 10.21.66.114 | 10.21.66.115 |
| 158 | 10.21.66.116/30 | 10.21.66.117 – 10.21.66.118 | 10.21.66.119 |
| 159 | 10.21.66.120/30 | 10.21.66.121 – 10.21.66.122 | 10.21.66.123 |
| 160 | 10.21.66.124/30 | 10.21.66.125 – 10.21.66.126 | 10.21.66.127 |
| 161 | 10.21.66.128/30 | 10.21.66.129 – 10.21.66.130 | 10.21.66.131 |
| 162 | 10.21.66.132/30 | 10.21.66.133 – 10.21.66.134 | 10.21.66.135 |
| 163 | 10.21.66.136/30 | 10.21.66.137 – 10.21.66.138 | 10.21.66.139 |
| 164 | 10.21.66.140/30 | 10.21.66.141 – 10.21.66.142 | 10.21.66.143 |
| 165 | 10.21.66.144/30 | 10.21.66.145 – 10.21.66.146 | 10.21.66.147 |
| 166 | 10.21.66.148/30 | 10.21.66.149 – 10.21.66.150 | 10.21.66.151 |
| 167 | 10.21.66.152/30 | 10.21.66.153 – 10.21.66.154 | 10.21.66.155 |
| 168 | 10.21.66.156/30 | 10.21.66.157 – 10.21.66.158 | 10.21.66.159 |
| 169 | 10.21.66.160/30 | 10.21.66.161 – 10.21.66.162 | 10.21.66.163 |
| 170 | 10.21.66.164/30 | 10.21.66.165 – 10.21.66.166 | 10.21.66.167 |
| 171 | 10.21.66.168/30 | 10.21.66.169 – 10.21.66.170 | 10.21.66.171 |
| 172 | 10.21.66.172/30 | 10.21.66.173 – 10.21.66.174 | 10.21.66.175 |
| 173 | 10.21.66.176/30 | 10.21.66.177 – 10.21.66.178 | 10.21.66.179 |
| 174 | 10.21.66.180/30 | 10.21.66.181 – 10.21.66.182 | 10.21.66.183 |
| 175 | 10.21.66.184/30 | 10.21.66.185 – 10.21.66.186 | 10.21.66.187 |
| 176 | 10.21.66.188/30 | 10.21.66.189 – 10.21.66.190 | 10.21.66.191 |
| 177 | 10.21.66.192/30 | 10.21.66.193 – 10.21.66.194 | 10.21.66.195 |
| 178 | 10.21.66.196/30 | 10.21.66.197 – 10.21.66.198 | 10.21.66.199 |
| 179 | 10.21.66.200/30 | 10.21.66.201 – 10.21.66.202 | 10.21.66.203 |
| 180 | 10.21.66.204/30 | 10.21.66.205 – 10.21.66.206 | 10.21.66.207 |
| 181 | 10.21.66.208/30 | 10.21.66.209 – 10.21.66.210 | 10.21.66.211 |
| 182 | 10.21.66.212/30 | 10.21.66.213 – 10.21.66.214 | 10.21.66.215 |
| 183 | 10.21.66.216/30 | 10.21.66.217 – 10.21.66.218 | 10.21.66.219 |
| 184 | 10.21.66.220/30 | 10.21.66.221 – 10.21.66.222 | 10.21.66.223 |
| 185 | 10.21.66.224/30 | 10.21.66.225 – 10.21.66.226 | 10.21.66.227 |
| 186 | 10.21.66.228/30 | 10.21.66.229 – 10.21.66.230 | 10.21.66.231 |
| 187 | 10.21.66.232/30 | 10.21.66.233 – 10.21.66.234 | 10.21.66.235 |
| 188 | 10.21.66.236/30 | 10.21.66.237 – 10.21.66.238 | 10.21.66.239 |
| 189 | 10.21.66.240/30 | 10.21.66.241 – 10.21.66.242 | 10.21.66.243 |
| 190 | 10.21.66.244/30 | 10.21.66.245 – 10.21.66.246 | 10.21.66.247 |
| 191 | 10.21.66.248/30 | 10.21.66.249 – 10.21.66.250 | 10.21.66.251 |
| 192 | 10.21.66.252/30 | 10.21.66.253 – 10.21.66.254 | 10.21.66.255 |
| 193 | 10.21.67.0/30 | 10.21.67.1 – 10.21.67.2 | 10.21.67.3 |
| 194 | 10.21.67.4/30 | 10.21.67.5 – 10.21.67.6 | 10.21.67.7 |
| 195 | 10.21.67.8/30 | 10.21.67.9 – 10.21.67.10 | 10.21.67.11 |
| 196 | 10.21.67.12/30 | 10.21.67.13 – 10.21.67.14 | 10.21.67.15 |
| 197 | 10.21.67.16/30 | 10.21.67.17 – 10.21.67.18 | 10.21.67.19 |
| 198 | 10.21.67.20/30 | 10.21.67.21 – 10.21.67.22 | 10.21.67.23 |
| 199 | 10.21.67.24/30 | 10.21.67.25 – 10.21.67.26 | 10.21.67.27 |
| 200 | 10.21.67.28/30 | 10.21.67.29 – 10.21.67.30 | 10.21.67.31 |
| 201 | 10.21.67.32/30 | 10.21.67.33 – 10.21.67.34 | 10.21.67.35 |
| 202 | 10.21.67.36/30 | 10.21.67.37 – 10.21.67.38 | 10.21.67.39 |
| 203 | 10.21.67.40/30 | 10.21.67.41 – 10.21.67.42 | 10.21.67.43 |
| 204 | 10.21.67.44/30 | 10.21.67.45 – 10.21.67.46 | 10.21.67.47 |
| 205 | 10.21.67.48/30 | 10.21.67.49 – 10.21.67.50 | 10.21.67.51 |
| 206 | 10.21.67.52/30 | 10.21.67.53 – 10.21.67.54 | 10.21.67.55 |
| 207 | 10.21.67.56/30 | 10.21.67.57 – 10.21.67.58 | 10.21.67.59 |
| 208 | 10.21.67.60/30 | 10.21.67.61 – 10.21.67.62 | 10.21.67.63 |
| 209 | 10.21.67.64/30 | 10.21.67.65 – 10.21.67.66 | 10.21.67.67 |
| 210 | 10.21.67.68/30 | 10.21.67.69 – 10.21.67.70 | 10.21.67.71 |
| 211 | 10.21.67.72/30 | 10.21.67.73 – 10.21.67.74 | 10.21.67.75 |
| 212 | 10.21.67.76/30 | 10.21.67.77 – 10.21.67.78 | 10.21.67.79 |
| 213 | 10.21.67.80/30 | 10.21.67.81 – 10.21.67.82 | 10.21.67.83 |
| 214 | 10.21.67.84/30 | 10.21.67.85 – 10.21.67.86 | 10.21.67.87 |
| 215 | 10.21.67.88/30 | 10.21.67.89 – 10.21.67.90 | 10.21.67.91 |
| 216 | 10.21.67.92/30 | 10.21.67.93 – 10.21.67.94 | 10.21.67.95 |
| 217 | 10.21.67.96/30 | 10.21.67.97 – 10.21.67.98 | 10.21.67.99 |
| 218 | 10.21.67.100/30 | 10.21.67.101 – 10.21.67.102 | 10.21.67.103 |
| 219 | 10.21.67.104/30 | 10.21.67.105 – 10.21.67.106 | 10.21.67.107 |
| 220 | 10.21.67.108/30 | 10.21.67.109 – 10.21.67.110 | 10.21.67.111 |
| 221 | 10.21.67.112/30 | 10.21.67.113 – 10.21.67.114 | 10.21.67.115 |
| 222 | 10.21.67.116/30 | 10.21.67.117 – 10.21.67.118 | 10.21.67.119 |
| 223 | 10.21.67.120/30 | 10.21.67.121 – 10.21.67.122 | 10.21.67.123 |
| 224 | 10.21.67.124/30 | 10.21.67.125 – 10.21.67.126 | 10.21.67.127 |
| 225 | 10.21.67.128/30 | 10.21.67.129 – 10.21.67.130 | 10.21.67.131 |
| 226 | 10.21.67.132/30 | 10.21.67.133 – 10.21.67.134 | 10.21.67.135 |
| 227 | 10.21.67.136/30 | 10.21.67.137 – 10.21.67.138 | 10.21.67.139 |
| 228 | 10.21.67.140/30 | 10.21.67.141 – 10.21.67.142 | 10.21.67.143 |
| 229 | 10.21.67.144/30 | 10.21.67.145 – 10.21.67.146 | 10.21.67.147 |
| 230 | 10.21.67.148/30 | 10.21.67.149 – 10.21.67.150 | 10.21.67.151 |
| 231 | 10.21.67.152/30 | 10.21.67.153 – 10.21.67.154 | 10.21.67.155 |
| 232 | 10.21.67.156/30 | 10.21.67.157 – 10.21.67.158 | 10.21.67.159 |
| 233 | 10.21.67.160/30 | 10.21.67.161 – 10.21.67.162 | 10.21.67.163 |
| 234 | 10.21.67.164/30 | 10.21.67.165 – 10.21.67.166 | 10.21.67.167 |
| 235 | 10.21.67.168/30 | 10.21.67.169 – 10.21.67.170 | 10.21.67.171 |
| 236 | 10.21.67.172/30 | 10.21.67.173 – 10.21.67.174 | 10.21.67.175 |
| 237 | 10.21.67.176/30 | 10.21.67.177 – 10.21.67.178 | 10.21.67.179 |
| 238 | 10.21.67.180/30 | 10.21.67.181 – 10.21.67.182 | 10.21.67.183 |
| 239 | 10.21.67.184/30 | 10.21.67.185 – 10.21.67.186 | 10.21.67.187 |
| 240 | 10.21.67.188/30 | 10.21.67.189 – 10.21.67.190 | 10.21.67.191 |
| 241 | 10.21.67.192/30 | 10.21.67.193 – 10.21.67.194 | 10.21.67.195 |
| 242 | 10.21.67.196/30 | 10.21.67.197 – 10.21.67.198 | 10.21.67.199 |
| 243 | 10.21.67.200/30 | 10.21.67.201 – 10.21.67.202 | 10.21.67.203 |
| 244 | 10.21.67.204/30 | 10.21.67.205 – 10.21.67.206 | 10.21.67.207 |
| 245 | 10.21.67.208/30 | 10.21.67.209 – 10.21.67.210 | 10.21.67.211 |
| 246 | 10.21.67.212/30 | 10.21.67.213 – 10.21.67.214 | 10.21.67.215 |
| 247 | 10.21.67.216/30 | 10.21.67.217 – 10.21.67.218 | 10.21.67.219 |
| 248 | 10.21.67.220/30 | 10.21.67.221 – 10.21.67.222 | 10.21.67.223 |
| 249 | 10.21.67.224/30 | 10.21.67.225 – 10.21.67.226 | 10.21.67.227 |
| 250 | 10.21.67.228/30 | 10.21.67.229 – 10.21.67.230 | 10.21.67.231 |
| 251 | 10.21.67.232/30 | 10.21.67.233 – 10.21.67.234 | 10.21.67.235 |
| 252 | 10.21.67.236/30 | 10.21.67.237 – 10.21.67.238 | 10.21.67.239 |
| 253 | 10.21.67.240/30 | 10.21.67.241 – 10.21.67.242 | 10.21.67.243 |
| 254 | 10.21.67.244/30 | 10.21.67.245 – 10.21.67.246 | 10.21.67.247 |
| 255 | 10.21.67.248/30 | 10.21.67.249 – 10.21.67.250 | 10.21.67.251 |
| 256 | 10.21.67.252/30 | 10.21.67.253 – 10.21.67.254 | 10.21.67.255 |
showing 256 of 4,096
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 /18 |
|---|---|---|---|---|
| /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 | 1 |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 2 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 4 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 8 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 16 split → |
| /23 | 255.255.254.0 | 512 | 510 | 32 split → |
| /24 | 255.255.255.0 | 256 | 254 | 64 split → |
| /25 | 255.255.255.128 | 128 | 126 | 128 split → |
| /26 | 255.255.255.192 | 64 | 62 | 256 split → |
| /27 | 255.255.255.224 | 32 | 30 | 512 split → |
| /28 | 255.255.255.240 | 16 | 14 | 1,024 split → |
| /29 | 255.255.255.248 | 8 | 6 | 2,048 split → |
| /30 | 255.255.255.252 | 4 | 2 | 4,096 split → |
| /31 | 255.255.255.254 | 2 | 2 | 8,192 split → |
| /32 | 255.255.255.255 | 1 | 1 | 16,384 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.