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)10.3.120.0/21
network10.3.120.0/21
broadcast10.3.127.255
first host10.3.120.1
last host10.3.127.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.3.120.0/21
address00001010.00000011.01111000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000011.01111000.00000000
broadcast00001010.00000011.01111111.11111111
green = network part, grey = host part
hex0x0a037800
decimal167999488
reverse dns0.120.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:7800
/21 split into /30 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.3.120.0/30 | 10.3.120.1 – 10.3.120.2 | 10.3.120.3 |
| 2 | 10.3.120.4/30 | 10.3.120.5 – 10.3.120.6 | 10.3.120.7 |
| 3 | 10.3.120.8/30 | 10.3.120.9 – 10.3.120.10 | 10.3.120.11 |
| 4 | 10.3.120.12/30 | 10.3.120.13 – 10.3.120.14 | 10.3.120.15 |
| 5 | 10.3.120.16/30 | 10.3.120.17 – 10.3.120.18 | 10.3.120.19 |
| 6 | 10.3.120.20/30 | 10.3.120.21 – 10.3.120.22 | 10.3.120.23 |
| 7 | 10.3.120.24/30 | 10.3.120.25 – 10.3.120.26 | 10.3.120.27 |
| 8 | 10.3.120.28/30 | 10.3.120.29 – 10.3.120.30 | 10.3.120.31 |
| 9 | 10.3.120.32/30 | 10.3.120.33 – 10.3.120.34 | 10.3.120.35 |
| 10 | 10.3.120.36/30 | 10.3.120.37 – 10.3.120.38 | 10.3.120.39 |
| 11 | 10.3.120.40/30 | 10.3.120.41 – 10.3.120.42 | 10.3.120.43 |
| 12 | 10.3.120.44/30 | 10.3.120.45 – 10.3.120.46 | 10.3.120.47 |
| 13 | 10.3.120.48/30 | 10.3.120.49 – 10.3.120.50 | 10.3.120.51 |
| 14 | 10.3.120.52/30 | 10.3.120.53 – 10.3.120.54 | 10.3.120.55 |
| 15 | 10.3.120.56/30 | 10.3.120.57 – 10.3.120.58 | 10.3.120.59 |
| 16 | 10.3.120.60/30 | 10.3.120.61 – 10.3.120.62 | 10.3.120.63 |
| 17 | 10.3.120.64/30 | 10.3.120.65 – 10.3.120.66 | 10.3.120.67 |
| 18 | 10.3.120.68/30 | 10.3.120.69 – 10.3.120.70 | 10.3.120.71 |
| 19 | 10.3.120.72/30 | 10.3.120.73 – 10.3.120.74 | 10.3.120.75 |
| 20 | 10.3.120.76/30 | 10.3.120.77 – 10.3.120.78 | 10.3.120.79 |
| 21 | 10.3.120.80/30 | 10.3.120.81 – 10.3.120.82 | 10.3.120.83 |
| 22 | 10.3.120.84/30 | 10.3.120.85 – 10.3.120.86 | 10.3.120.87 |
| 23 | 10.3.120.88/30 | 10.3.120.89 – 10.3.120.90 | 10.3.120.91 |
| 24 | 10.3.120.92/30 | 10.3.120.93 – 10.3.120.94 | 10.3.120.95 |
| 25 | 10.3.120.96/30 | 10.3.120.97 – 10.3.120.98 | 10.3.120.99 |
| 26 | 10.3.120.100/30 | 10.3.120.101 – 10.3.120.102 | 10.3.120.103 |
| 27 | 10.3.120.104/30 | 10.3.120.105 – 10.3.120.106 | 10.3.120.107 |
| 28 | 10.3.120.108/30 | 10.3.120.109 – 10.3.120.110 | 10.3.120.111 |
| 29 | 10.3.120.112/30 | 10.3.120.113 – 10.3.120.114 | 10.3.120.115 |
| 30 | 10.3.120.116/30 | 10.3.120.117 – 10.3.120.118 | 10.3.120.119 |
| 31 | 10.3.120.120/30 | 10.3.120.121 – 10.3.120.122 | 10.3.120.123 |
| 32 | 10.3.120.124/30 | 10.3.120.125 – 10.3.120.126 | 10.3.120.127 |
| 33 | 10.3.120.128/30 | 10.3.120.129 – 10.3.120.130 | 10.3.120.131 |
| 34 | 10.3.120.132/30 | 10.3.120.133 – 10.3.120.134 | 10.3.120.135 |
| 35 | 10.3.120.136/30 | 10.3.120.137 – 10.3.120.138 | 10.3.120.139 |
| 36 | 10.3.120.140/30 | 10.3.120.141 – 10.3.120.142 | 10.3.120.143 |
| 37 | 10.3.120.144/30 | 10.3.120.145 – 10.3.120.146 | 10.3.120.147 |
| 38 | 10.3.120.148/30 | 10.3.120.149 – 10.3.120.150 | 10.3.120.151 |
| 39 | 10.3.120.152/30 | 10.3.120.153 – 10.3.120.154 | 10.3.120.155 |
| 40 | 10.3.120.156/30 | 10.3.120.157 – 10.3.120.158 | 10.3.120.159 |
| 41 | 10.3.120.160/30 | 10.3.120.161 – 10.3.120.162 | 10.3.120.163 |
| 42 | 10.3.120.164/30 | 10.3.120.165 – 10.3.120.166 | 10.3.120.167 |
| 43 | 10.3.120.168/30 | 10.3.120.169 – 10.3.120.170 | 10.3.120.171 |
| 44 | 10.3.120.172/30 | 10.3.120.173 – 10.3.120.174 | 10.3.120.175 |
| 45 | 10.3.120.176/30 | 10.3.120.177 – 10.3.120.178 | 10.3.120.179 |
| 46 | 10.3.120.180/30 | 10.3.120.181 – 10.3.120.182 | 10.3.120.183 |
| 47 | 10.3.120.184/30 | 10.3.120.185 – 10.3.120.186 | 10.3.120.187 |
| 48 | 10.3.120.188/30 | 10.3.120.189 – 10.3.120.190 | 10.3.120.191 |
| 49 | 10.3.120.192/30 | 10.3.120.193 – 10.3.120.194 | 10.3.120.195 |
| 50 | 10.3.120.196/30 | 10.3.120.197 – 10.3.120.198 | 10.3.120.199 |
| 51 | 10.3.120.200/30 | 10.3.120.201 – 10.3.120.202 | 10.3.120.203 |
| 52 | 10.3.120.204/30 | 10.3.120.205 – 10.3.120.206 | 10.3.120.207 |
| 53 | 10.3.120.208/30 | 10.3.120.209 – 10.3.120.210 | 10.3.120.211 |
| 54 | 10.3.120.212/30 | 10.3.120.213 – 10.3.120.214 | 10.3.120.215 |
| 55 | 10.3.120.216/30 | 10.3.120.217 – 10.3.120.218 | 10.3.120.219 |
| 56 | 10.3.120.220/30 | 10.3.120.221 – 10.3.120.222 | 10.3.120.223 |
| 57 | 10.3.120.224/30 | 10.3.120.225 – 10.3.120.226 | 10.3.120.227 |
| 58 | 10.3.120.228/30 | 10.3.120.229 – 10.3.120.230 | 10.3.120.231 |
| 59 | 10.3.120.232/30 | 10.3.120.233 – 10.3.120.234 | 10.3.120.235 |
| 60 | 10.3.120.236/30 | 10.3.120.237 – 10.3.120.238 | 10.3.120.239 |
| 61 | 10.3.120.240/30 | 10.3.120.241 – 10.3.120.242 | 10.3.120.243 |
| 62 | 10.3.120.244/30 | 10.3.120.245 – 10.3.120.246 | 10.3.120.247 |
| 63 | 10.3.120.248/30 | 10.3.120.249 – 10.3.120.250 | 10.3.120.251 |
| 64 | 10.3.120.252/30 | 10.3.120.253 – 10.3.120.254 | 10.3.120.255 |
| 65 | 10.3.121.0/30 | 10.3.121.1 – 10.3.121.2 | 10.3.121.3 |
| 66 | 10.3.121.4/30 | 10.3.121.5 – 10.3.121.6 | 10.3.121.7 |
| 67 | 10.3.121.8/30 | 10.3.121.9 – 10.3.121.10 | 10.3.121.11 |
| 68 | 10.3.121.12/30 | 10.3.121.13 – 10.3.121.14 | 10.3.121.15 |
| 69 | 10.3.121.16/30 | 10.3.121.17 – 10.3.121.18 | 10.3.121.19 |
| 70 | 10.3.121.20/30 | 10.3.121.21 – 10.3.121.22 | 10.3.121.23 |
| 71 | 10.3.121.24/30 | 10.3.121.25 – 10.3.121.26 | 10.3.121.27 |
| 72 | 10.3.121.28/30 | 10.3.121.29 – 10.3.121.30 | 10.3.121.31 |
| 73 | 10.3.121.32/30 | 10.3.121.33 – 10.3.121.34 | 10.3.121.35 |
| 74 | 10.3.121.36/30 | 10.3.121.37 – 10.3.121.38 | 10.3.121.39 |
| 75 | 10.3.121.40/30 | 10.3.121.41 – 10.3.121.42 | 10.3.121.43 |
| 76 | 10.3.121.44/30 | 10.3.121.45 – 10.3.121.46 | 10.3.121.47 |
| 77 | 10.3.121.48/30 | 10.3.121.49 – 10.3.121.50 | 10.3.121.51 |
| 78 | 10.3.121.52/30 | 10.3.121.53 – 10.3.121.54 | 10.3.121.55 |
| 79 | 10.3.121.56/30 | 10.3.121.57 – 10.3.121.58 | 10.3.121.59 |
| 80 | 10.3.121.60/30 | 10.3.121.61 – 10.3.121.62 | 10.3.121.63 |
| 81 | 10.3.121.64/30 | 10.3.121.65 – 10.3.121.66 | 10.3.121.67 |
| 82 | 10.3.121.68/30 | 10.3.121.69 – 10.3.121.70 | 10.3.121.71 |
| 83 | 10.3.121.72/30 | 10.3.121.73 – 10.3.121.74 | 10.3.121.75 |
| 84 | 10.3.121.76/30 | 10.3.121.77 – 10.3.121.78 | 10.3.121.79 |
| 85 | 10.3.121.80/30 | 10.3.121.81 – 10.3.121.82 | 10.3.121.83 |
| 86 | 10.3.121.84/30 | 10.3.121.85 – 10.3.121.86 | 10.3.121.87 |
| 87 | 10.3.121.88/30 | 10.3.121.89 – 10.3.121.90 | 10.3.121.91 |
| 88 | 10.3.121.92/30 | 10.3.121.93 – 10.3.121.94 | 10.3.121.95 |
| 89 | 10.3.121.96/30 | 10.3.121.97 – 10.3.121.98 | 10.3.121.99 |
| 90 | 10.3.121.100/30 | 10.3.121.101 – 10.3.121.102 | 10.3.121.103 |
| 91 | 10.3.121.104/30 | 10.3.121.105 – 10.3.121.106 | 10.3.121.107 |
| 92 | 10.3.121.108/30 | 10.3.121.109 – 10.3.121.110 | 10.3.121.111 |
| 93 | 10.3.121.112/30 | 10.3.121.113 – 10.3.121.114 | 10.3.121.115 |
| 94 | 10.3.121.116/30 | 10.3.121.117 – 10.3.121.118 | 10.3.121.119 |
| 95 | 10.3.121.120/30 | 10.3.121.121 – 10.3.121.122 | 10.3.121.123 |
| 96 | 10.3.121.124/30 | 10.3.121.125 – 10.3.121.126 | 10.3.121.127 |
| 97 | 10.3.121.128/30 | 10.3.121.129 – 10.3.121.130 | 10.3.121.131 |
| 98 | 10.3.121.132/30 | 10.3.121.133 – 10.3.121.134 | 10.3.121.135 |
| 99 | 10.3.121.136/30 | 10.3.121.137 – 10.3.121.138 | 10.3.121.139 |
| 100 | 10.3.121.140/30 | 10.3.121.141 – 10.3.121.142 | 10.3.121.143 |
| 101 | 10.3.121.144/30 | 10.3.121.145 – 10.3.121.146 | 10.3.121.147 |
| 102 | 10.3.121.148/30 | 10.3.121.149 – 10.3.121.150 | 10.3.121.151 |
| 103 | 10.3.121.152/30 | 10.3.121.153 – 10.3.121.154 | 10.3.121.155 |
| 104 | 10.3.121.156/30 | 10.3.121.157 – 10.3.121.158 | 10.3.121.159 |
| 105 | 10.3.121.160/30 | 10.3.121.161 – 10.3.121.162 | 10.3.121.163 |
| 106 | 10.3.121.164/30 | 10.3.121.165 – 10.3.121.166 | 10.3.121.167 |
| 107 | 10.3.121.168/30 | 10.3.121.169 – 10.3.121.170 | 10.3.121.171 |
| 108 | 10.3.121.172/30 | 10.3.121.173 – 10.3.121.174 | 10.3.121.175 |
| 109 | 10.3.121.176/30 | 10.3.121.177 – 10.3.121.178 | 10.3.121.179 |
| 110 | 10.3.121.180/30 | 10.3.121.181 – 10.3.121.182 | 10.3.121.183 |
| 111 | 10.3.121.184/30 | 10.3.121.185 – 10.3.121.186 | 10.3.121.187 |
| 112 | 10.3.121.188/30 | 10.3.121.189 – 10.3.121.190 | 10.3.121.191 |
| 113 | 10.3.121.192/30 | 10.3.121.193 – 10.3.121.194 | 10.3.121.195 |
| 114 | 10.3.121.196/30 | 10.3.121.197 – 10.3.121.198 | 10.3.121.199 |
| 115 | 10.3.121.200/30 | 10.3.121.201 – 10.3.121.202 | 10.3.121.203 |
| 116 | 10.3.121.204/30 | 10.3.121.205 – 10.3.121.206 | 10.3.121.207 |
| 117 | 10.3.121.208/30 | 10.3.121.209 – 10.3.121.210 | 10.3.121.211 |
| 118 | 10.3.121.212/30 | 10.3.121.213 – 10.3.121.214 | 10.3.121.215 |
| 119 | 10.3.121.216/30 | 10.3.121.217 – 10.3.121.218 | 10.3.121.219 |
| 120 | 10.3.121.220/30 | 10.3.121.221 – 10.3.121.222 | 10.3.121.223 |
| 121 | 10.3.121.224/30 | 10.3.121.225 – 10.3.121.226 | 10.3.121.227 |
| 122 | 10.3.121.228/30 | 10.3.121.229 – 10.3.121.230 | 10.3.121.231 |
| 123 | 10.3.121.232/30 | 10.3.121.233 – 10.3.121.234 | 10.3.121.235 |
| 124 | 10.3.121.236/30 | 10.3.121.237 – 10.3.121.238 | 10.3.121.239 |
| 125 | 10.3.121.240/30 | 10.3.121.241 – 10.3.121.242 | 10.3.121.243 |
| 126 | 10.3.121.244/30 | 10.3.121.245 – 10.3.121.246 | 10.3.121.247 |
| 127 | 10.3.121.248/30 | 10.3.121.249 – 10.3.121.250 | 10.3.121.251 |
| 128 | 10.3.121.252/30 | 10.3.121.253 – 10.3.121.254 | 10.3.121.255 |
| 129 | 10.3.122.0/30 | 10.3.122.1 – 10.3.122.2 | 10.3.122.3 |
| 130 | 10.3.122.4/30 | 10.3.122.5 – 10.3.122.6 | 10.3.122.7 |
| 131 | 10.3.122.8/30 | 10.3.122.9 – 10.3.122.10 | 10.3.122.11 |
| 132 | 10.3.122.12/30 | 10.3.122.13 – 10.3.122.14 | 10.3.122.15 |
| 133 | 10.3.122.16/30 | 10.3.122.17 – 10.3.122.18 | 10.3.122.19 |
| 134 | 10.3.122.20/30 | 10.3.122.21 – 10.3.122.22 | 10.3.122.23 |
| 135 | 10.3.122.24/30 | 10.3.122.25 – 10.3.122.26 | 10.3.122.27 |
| 136 | 10.3.122.28/30 | 10.3.122.29 – 10.3.122.30 | 10.3.122.31 |
| 137 | 10.3.122.32/30 | 10.3.122.33 – 10.3.122.34 | 10.3.122.35 |
| 138 | 10.3.122.36/30 | 10.3.122.37 – 10.3.122.38 | 10.3.122.39 |
| 139 | 10.3.122.40/30 | 10.3.122.41 – 10.3.122.42 | 10.3.122.43 |
| 140 | 10.3.122.44/30 | 10.3.122.45 – 10.3.122.46 | 10.3.122.47 |
| 141 | 10.3.122.48/30 | 10.3.122.49 – 10.3.122.50 | 10.3.122.51 |
| 142 | 10.3.122.52/30 | 10.3.122.53 – 10.3.122.54 | 10.3.122.55 |
| 143 | 10.3.122.56/30 | 10.3.122.57 – 10.3.122.58 | 10.3.122.59 |
| 144 | 10.3.122.60/30 | 10.3.122.61 – 10.3.122.62 | 10.3.122.63 |
| 145 | 10.3.122.64/30 | 10.3.122.65 – 10.3.122.66 | 10.3.122.67 |
| 146 | 10.3.122.68/30 | 10.3.122.69 – 10.3.122.70 | 10.3.122.71 |
| 147 | 10.3.122.72/30 | 10.3.122.73 – 10.3.122.74 | 10.3.122.75 |
| 148 | 10.3.122.76/30 | 10.3.122.77 – 10.3.122.78 | 10.3.122.79 |
| 149 | 10.3.122.80/30 | 10.3.122.81 – 10.3.122.82 | 10.3.122.83 |
| 150 | 10.3.122.84/30 | 10.3.122.85 – 10.3.122.86 | 10.3.122.87 |
| 151 | 10.3.122.88/30 | 10.3.122.89 – 10.3.122.90 | 10.3.122.91 |
| 152 | 10.3.122.92/30 | 10.3.122.93 – 10.3.122.94 | 10.3.122.95 |
| 153 | 10.3.122.96/30 | 10.3.122.97 – 10.3.122.98 | 10.3.122.99 |
| 154 | 10.3.122.100/30 | 10.3.122.101 – 10.3.122.102 | 10.3.122.103 |
| 155 | 10.3.122.104/30 | 10.3.122.105 – 10.3.122.106 | 10.3.122.107 |
| 156 | 10.3.122.108/30 | 10.3.122.109 – 10.3.122.110 | 10.3.122.111 |
| 157 | 10.3.122.112/30 | 10.3.122.113 – 10.3.122.114 | 10.3.122.115 |
| 158 | 10.3.122.116/30 | 10.3.122.117 – 10.3.122.118 | 10.3.122.119 |
| 159 | 10.3.122.120/30 | 10.3.122.121 – 10.3.122.122 | 10.3.122.123 |
| 160 | 10.3.122.124/30 | 10.3.122.125 – 10.3.122.126 | 10.3.122.127 |
| 161 | 10.3.122.128/30 | 10.3.122.129 – 10.3.122.130 | 10.3.122.131 |
| 162 | 10.3.122.132/30 | 10.3.122.133 – 10.3.122.134 | 10.3.122.135 |
| 163 | 10.3.122.136/30 | 10.3.122.137 – 10.3.122.138 | 10.3.122.139 |
| 164 | 10.3.122.140/30 | 10.3.122.141 – 10.3.122.142 | 10.3.122.143 |
| 165 | 10.3.122.144/30 | 10.3.122.145 – 10.3.122.146 | 10.3.122.147 |
| 166 | 10.3.122.148/30 | 10.3.122.149 – 10.3.122.150 | 10.3.122.151 |
| 167 | 10.3.122.152/30 | 10.3.122.153 – 10.3.122.154 | 10.3.122.155 |
| 168 | 10.3.122.156/30 | 10.3.122.157 – 10.3.122.158 | 10.3.122.159 |
| 169 | 10.3.122.160/30 | 10.3.122.161 – 10.3.122.162 | 10.3.122.163 |
| 170 | 10.3.122.164/30 | 10.3.122.165 – 10.3.122.166 | 10.3.122.167 |
| 171 | 10.3.122.168/30 | 10.3.122.169 – 10.3.122.170 | 10.3.122.171 |
| 172 | 10.3.122.172/30 | 10.3.122.173 – 10.3.122.174 | 10.3.122.175 |
| 173 | 10.3.122.176/30 | 10.3.122.177 – 10.3.122.178 | 10.3.122.179 |
| 174 | 10.3.122.180/30 | 10.3.122.181 – 10.3.122.182 | 10.3.122.183 |
| 175 | 10.3.122.184/30 | 10.3.122.185 – 10.3.122.186 | 10.3.122.187 |
| 176 | 10.3.122.188/30 | 10.3.122.189 – 10.3.122.190 | 10.3.122.191 |
| 177 | 10.3.122.192/30 | 10.3.122.193 – 10.3.122.194 | 10.3.122.195 |
| 178 | 10.3.122.196/30 | 10.3.122.197 – 10.3.122.198 | 10.3.122.199 |
| 179 | 10.3.122.200/30 | 10.3.122.201 – 10.3.122.202 | 10.3.122.203 |
| 180 | 10.3.122.204/30 | 10.3.122.205 – 10.3.122.206 | 10.3.122.207 |
| 181 | 10.3.122.208/30 | 10.3.122.209 – 10.3.122.210 | 10.3.122.211 |
| 182 | 10.3.122.212/30 | 10.3.122.213 – 10.3.122.214 | 10.3.122.215 |
| 183 | 10.3.122.216/30 | 10.3.122.217 – 10.3.122.218 | 10.3.122.219 |
| 184 | 10.3.122.220/30 | 10.3.122.221 – 10.3.122.222 | 10.3.122.223 |
| 185 | 10.3.122.224/30 | 10.3.122.225 – 10.3.122.226 | 10.3.122.227 |
| 186 | 10.3.122.228/30 | 10.3.122.229 – 10.3.122.230 | 10.3.122.231 |
| 187 | 10.3.122.232/30 | 10.3.122.233 – 10.3.122.234 | 10.3.122.235 |
| 188 | 10.3.122.236/30 | 10.3.122.237 – 10.3.122.238 | 10.3.122.239 |
| 189 | 10.3.122.240/30 | 10.3.122.241 – 10.3.122.242 | 10.3.122.243 |
| 190 | 10.3.122.244/30 | 10.3.122.245 – 10.3.122.246 | 10.3.122.247 |
| 191 | 10.3.122.248/30 | 10.3.122.249 – 10.3.122.250 | 10.3.122.251 |
| 192 | 10.3.122.252/30 | 10.3.122.253 – 10.3.122.254 | 10.3.122.255 |
| 193 | 10.3.123.0/30 | 10.3.123.1 – 10.3.123.2 | 10.3.123.3 |
| 194 | 10.3.123.4/30 | 10.3.123.5 – 10.3.123.6 | 10.3.123.7 |
| 195 | 10.3.123.8/30 | 10.3.123.9 – 10.3.123.10 | 10.3.123.11 |
| 196 | 10.3.123.12/30 | 10.3.123.13 – 10.3.123.14 | 10.3.123.15 |
| 197 | 10.3.123.16/30 | 10.3.123.17 – 10.3.123.18 | 10.3.123.19 |
| 198 | 10.3.123.20/30 | 10.3.123.21 – 10.3.123.22 | 10.3.123.23 |
| 199 | 10.3.123.24/30 | 10.3.123.25 – 10.3.123.26 | 10.3.123.27 |
| 200 | 10.3.123.28/30 | 10.3.123.29 – 10.3.123.30 | 10.3.123.31 |
| 201 | 10.3.123.32/30 | 10.3.123.33 – 10.3.123.34 | 10.3.123.35 |
| 202 | 10.3.123.36/30 | 10.3.123.37 – 10.3.123.38 | 10.3.123.39 |
| 203 | 10.3.123.40/30 | 10.3.123.41 – 10.3.123.42 | 10.3.123.43 |
| 204 | 10.3.123.44/30 | 10.3.123.45 – 10.3.123.46 | 10.3.123.47 |
| 205 | 10.3.123.48/30 | 10.3.123.49 – 10.3.123.50 | 10.3.123.51 |
| 206 | 10.3.123.52/30 | 10.3.123.53 – 10.3.123.54 | 10.3.123.55 |
| 207 | 10.3.123.56/30 | 10.3.123.57 – 10.3.123.58 | 10.3.123.59 |
| 208 | 10.3.123.60/30 | 10.3.123.61 – 10.3.123.62 | 10.3.123.63 |
| 209 | 10.3.123.64/30 | 10.3.123.65 – 10.3.123.66 | 10.3.123.67 |
| 210 | 10.3.123.68/30 | 10.3.123.69 – 10.3.123.70 | 10.3.123.71 |
| 211 | 10.3.123.72/30 | 10.3.123.73 – 10.3.123.74 | 10.3.123.75 |
| 212 | 10.3.123.76/30 | 10.3.123.77 – 10.3.123.78 | 10.3.123.79 |
| 213 | 10.3.123.80/30 | 10.3.123.81 – 10.3.123.82 | 10.3.123.83 |
| 214 | 10.3.123.84/30 | 10.3.123.85 – 10.3.123.86 | 10.3.123.87 |
| 215 | 10.3.123.88/30 | 10.3.123.89 – 10.3.123.90 | 10.3.123.91 |
| 216 | 10.3.123.92/30 | 10.3.123.93 – 10.3.123.94 | 10.3.123.95 |
| 217 | 10.3.123.96/30 | 10.3.123.97 – 10.3.123.98 | 10.3.123.99 |
| 218 | 10.3.123.100/30 | 10.3.123.101 – 10.3.123.102 | 10.3.123.103 |
| 219 | 10.3.123.104/30 | 10.3.123.105 – 10.3.123.106 | 10.3.123.107 |
| 220 | 10.3.123.108/30 | 10.3.123.109 – 10.3.123.110 | 10.3.123.111 |
| 221 | 10.3.123.112/30 | 10.3.123.113 – 10.3.123.114 | 10.3.123.115 |
| 222 | 10.3.123.116/30 | 10.3.123.117 – 10.3.123.118 | 10.3.123.119 |
| 223 | 10.3.123.120/30 | 10.3.123.121 – 10.3.123.122 | 10.3.123.123 |
| 224 | 10.3.123.124/30 | 10.3.123.125 – 10.3.123.126 | 10.3.123.127 |
| 225 | 10.3.123.128/30 | 10.3.123.129 – 10.3.123.130 | 10.3.123.131 |
| 226 | 10.3.123.132/30 | 10.3.123.133 – 10.3.123.134 | 10.3.123.135 |
| 227 | 10.3.123.136/30 | 10.3.123.137 – 10.3.123.138 | 10.3.123.139 |
| 228 | 10.3.123.140/30 | 10.3.123.141 – 10.3.123.142 | 10.3.123.143 |
| 229 | 10.3.123.144/30 | 10.3.123.145 – 10.3.123.146 | 10.3.123.147 |
| 230 | 10.3.123.148/30 | 10.3.123.149 – 10.3.123.150 | 10.3.123.151 |
| 231 | 10.3.123.152/30 | 10.3.123.153 – 10.3.123.154 | 10.3.123.155 |
| 232 | 10.3.123.156/30 | 10.3.123.157 – 10.3.123.158 | 10.3.123.159 |
| 233 | 10.3.123.160/30 | 10.3.123.161 – 10.3.123.162 | 10.3.123.163 |
| 234 | 10.3.123.164/30 | 10.3.123.165 – 10.3.123.166 | 10.3.123.167 |
| 235 | 10.3.123.168/30 | 10.3.123.169 – 10.3.123.170 | 10.3.123.171 |
| 236 | 10.3.123.172/30 | 10.3.123.173 – 10.3.123.174 | 10.3.123.175 |
| 237 | 10.3.123.176/30 | 10.3.123.177 – 10.3.123.178 | 10.3.123.179 |
| 238 | 10.3.123.180/30 | 10.3.123.181 – 10.3.123.182 | 10.3.123.183 |
| 239 | 10.3.123.184/30 | 10.3.123.185 – 10.3.123.186 | 10.3.123.187 |
| 240 | 10.3.123.188/30 | 10.3.123.189 – 10.3.123.190 | 10.3.123.191 |
| 241 | 10.3.123.192/30 | 10.3.123.193 – 10.3.123.194 | 10.3.123.195 |
| 242 | 10.3.123.196/30 | 10.3.123.197 – 10.3.123.198 | 10.3.123.199 |
| 243 | 10.3.123.200/30 | 10.3.123.201 – 10.3.123.202 | 10.3.123.203 |
| 244 | 10.3.123.204/30 | 10.3.123.205 – 10.3.123.206 | 10.3.123.207 |
| 245 | 10.3.123.208/30 | 10.3.123.209 – 10.3.123.210 | 10.3.123.211 |
| 246 | 10.3.123.212/30 | 10.3.123.213 – 10.3.123.214 | 10.3.123.215 |
| 247 | 10.3.123.216/30 | 10.3.123.217 – 10.3.123.218 | 10.3.123.219 |
| 248 | 10.3.123.220/30 | 10.3.123.221 – 10.3.123.222 | 10.3.123.223 |
| 249 | 10.3.123.224/30 | 10.3.123.225 – 10.3.123.226 | 10.3.123.227 |
| 250 | 10.3.123.228/30 | 10.3.123.229 – 10.3.123.230 | 10.3.123.231 |
| 251 | 10.3.123.232/30 | 10.3.123.233 – 10.3.123.234 | 10.3.123.235 |
| 252 | 10.3.123.236/30 | 10.3.123.237 – 10.3.123.238 | 10.3.123.239 |
| 253 | 10.3.123.240/30 | 10.3.123.241 – 10.3.123.242 | 10.3.123.243 |
| 254 | 10.3.123.244/30 | 10.3.123.245 – 10.3.123.246 | 10.3.123.247 |
| 255 | 10.3.123.248/30 | 10.3.123.249 – 10.3.123.250 | 10.3.123.251 |
| 256 | 10.3.123.252/30 | 10.3.123.253 – 10.3.123.254 | 10.3.123.255 |
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 /21 |
|---|---|---|---|---|
| /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 | - |
| /20 | 255.255.240.0 | 4,096 | 4,094 | - |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 1 |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 2 split → |
| /23 | 255.255.254.0 | 512 | 510 | 4 split → |
| /24 | 255.255.255.0 | 256 | 254 | 8 split → |
| /25 | 255.255.255.128 | 128 | 126 | 16 split → |
| /26 | 255.255.255.192 | 64 | 62 | 32 split → |
| /27 | 255.255.255.224 | 32 | 30 | 64 split → |
| /28 | 255.255.255.240 | 16 | 14 | 128 split → |
| /29 | 255.255.255.248 | 8 | 6 | 256 split → |
| /30 | 255.255.255.252 | 4 | 2 | 512 split → |
| /31 | 255.255.255.254 | 2 | 2 | 1,024 split → |
| /32 | 255.255.255.255 | 1 | 1 | 2,048 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.