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)10.4.120.0/21
network10.4.120.0/21
broadcast10.4.127.255
first host10.4.120.1
last host10.4.127.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.4.120.0/21
address00001010.00000100.01111000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.00000100.01111000.00000000
broadcast00001010.00000100.01111111.11111111
green = network part, grey = host part
hex0x0a047800
decimal168065024
reverse dns0.120.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:7800
/21 split into /31 · 1,024 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.4.120.0/31 | 10.4.120.0 – 10.4.120.1 | 10.4.120.1 |
| 2 | 10.4.120.2/31 | 10.4.120.2 – 10.4.120.3 | 10.4.120.3 |
| 3 | 10.4.120.4/31 | 10.4.120.4 – 10.4.120.5 | 10.4.120.5 |
| 4 | 10.4.120.6/31 | 10.4.120.6 – 10.4.120.7 | 10.4.120.7 |
| 5 | 10.4.120.8/31 | 10.4.120.8 – 10.4.120.9 | 10.4.120.9 |
| 6 | 10.4.120.10/31 | 10.4.120.10 – 10.4.120.11 | 10.4.120.11 |
| 7 | 10.4.120.12/31 | 10.4.120.12 – 10.4.120.13 | 10.4.120.13 |
| 8 | 10.4.120.14/31 | 10.4.120.14 – 10.4.120.15 | 10.4.120.15 |
| 9 | 10.4.120.16/31 | 10.4.120.16 – 10.4.120.17 | 10.4.120.17 |
| 10 | 10.4.120.18/31 | 10.4.120.18 – 10.4.120.19 | 10.4.120.19 |
| 11 | 10.4.120.20/31 | 10.4.120.20 – 10.4.120.21 | 10.4.120.21 |
| 12 | 10.4.120.22/31 | 10.4.120.22 – 10.4.120.23 | 10.4.120.23 |
| 13 | 10.4.120.24/31 | 10.4.120.24 – 10.4.120.25 | 10.4.120.25 |
| 14 | 10.4.120.26/31 | 10.4.120.26 – 10.4.120.27 | 10.4.120.27 |
| 15 | 10.4.120.28/31 | 10.4.120.28 – 10.4.120.29 | 10.4.120.29 |
| 16 | 10.4.120.30/31 | 10.4.120.30 – 10.4.120.31 | 10.4.120.31 |
| 17 | 10.4.120.32/31 | 10.4.120.32 – 10.4.120.33 | 10.4.120.33 |
| 18 | 10.4.120.34/31 | 10.4.120.34 – 10.4.120.35 | 10.4.120.35 |
| 19 | 10.4.120.36/31 | 10.4.120.36 – 10.4.120.37 | 10.4.120.37 |
| 20 | 10.4.120.38/31 | 10.4.120.38 – 10.4.120.39 | 10.4.120.39 |
| 21 | 10.4.120.40/31 | 10.4.120.40 – 10.4.120.41 | 10.4.120.41 |
| 22 | 10.4.120.42/31 | 10.4.120.42 – 10.4.120.43 | 10.4.120.43 |
| 23 | 10.4.120.44/31 | 10.4.120.44 – 10.4.120.45 | 10.4.120.45 |
| 24 | 10.4.120.46/31 | 10.4.120.46 – 10.4.120.47 | 10.4.120.47 |
| 25 | 10.4.120.48/31 | 10.4.120.48 – 10.4.120.49 | 10.4.120.49 |
| 26 | 10.4.120.50/31 | 10.4.120.50 – 10.4.120.51 | 10.4.120.51 |
| 27 | 10.4.120.52/31 | 10.4.120.52 – 10.4.120.53 | 10.4.120.53 |
| 28 | 10.4.120.54/31 | 10.4.120.54 – 10.4.120.55 | 10.4.120.55 |
| 29 | 10.4.120.56/31 | 10.4.120.56 – 10.4.120.57 | 10.4.120.57 |
| 30 | 10.4.120.58/31 | 10.4.120.58 – 10.4.120.59 | 10.4.120.59 |
| 31 | 10.4.120.60/31 | 10.4.120.60 – 10.4.120.61 | 10.4.120.61 |
| 32 | 10.4.120.62/31 | 10.4.120.62 – 10.4.120.63 | 10.4.120.63 |
| 33 | 10.4.120.64/31 | 10.4.120.64 – 10.4.120.65 | 10.4.120.65 |
| 34 | 10.4.120.66/31 | 10.4.120.66 – 10.4.120.67 | 10.4.120.67 |
| 35 | 10.4.120.68/31 | 10.4.120.68 – 10.4.120.69 | 10.4.120.69 |
| 36 | 10.4.120.70/31 | 10.4.120.70 – 10.4.120.71 | 10.4.120.71 |
| 37 | 10.4.120.72/31 | 10.4.120.72 – 10.4.120.73 | 10.4.120.73 |
| 38 | 10.4.120.74/31 | 10.4.120.74 – 10.4.120.75 | 10.4.120.75 |
| 39 | 10.4.120.76/31 | 10.4.120.76 – 10.4.120.77 | 10.4.120.77 |
| 40 | 10.4.120.78/31 | 10.4.120.78 – 10.4.120.79 | 10.4.120.79 |
| 41 | 10.4.120.80/31 | 10.4.120.80 – 10.4.120.81 | 10.4.120.81 |
| 42 | 10.4.120.82/31 | 10.4.120.82 – 10.4.120.83 | 10.4.120.83 |
| 43 | 10.4.120.84/31 | 10.4.120.84 – 10.4.120.85 | 10.4.120.85 |
| 44 | 10.4.120.86/31 | 10.4.120.86 – 10.4.120.87 | 10.4.120.87 |
| 45 | 10.4.120.88/31 | 10.4.120.88 – 10.4.120.89 | 10.4.120.89 |
| 46 | 10.4.120.90/31 | 10.4.120.90 – 10.4.120.91 | 10.4.120.91 |
| 47 | 10.4.120.92/31 | 10.4.120.92 – 10.4.120.93 | 10.4.120.93 |
| 48 | 10.4.120.94/31 | 10.4.120.94 – 10.4.120.95 | 10.4.120.95 |
| 49 | 10.4.120.96/31 | 10.4.120.96 – 10.4.120.97 | 10.4.120.97 |
| 50 | 10.4.120.98/31 | 10.4.120.98 – 10.4.120.99 | 10.4.120.99 |
| 51 | 10.4.120.100/31 | 10.4.120.100 – 10.4.120.101 | 10.4.120.101 |
| 52 | 10.4.120.102/31 | 10.4.120.102 – 10.4.120.103 | 10.4.120.103 |
| 53 | 10.4.120.104/31 | 10.4.120.104 – 10.4.120.105 | 10.4.120.105 |
| 54 | 10.4.120.106/31 | 10.4.120.106 – 10.4.120.107 | 10.4.120.107 |
| 55 | 10.4.120.108/31 | 10.4.120.108 – 10.4.120.109 | 10.4.120.109 |
| 56 | 10.4.120.110/31 | 10.4.120.110 – 10.4.120.111 | 10.4.120.111 |
| 57 | 10.4.120.112/31 | 10.4.120.112 – 10.4.120.113 | 10.4.120.113 |
| 58 | 10.4.120.114/31 | 10.4.120.114 – 10.4.120.115 | 10.4.120.115 |
| 59 | 10.4.120.116/31 | 10.4.120.116 – 10.4.120.117 | 10.4.120.117 |
| 60 | 10.4.120.118/31 | 10.4.120.118 – 10.4.120.119 | 10.4.120.119 |
| 61 | 10.4.120.120/31 | 10.4.120.120 – 10.4.120.121 | 10.4.120.121 |
| 62 | 10.4.120.122/31 | 10.4.120.122 – 10.4.120.123 | 10.4.120.123 |
| 63 | 10.4.120.124/31 | 10.4.120.124 – 10.4.120.125 | 10.4.120.125 |
| 64 | 10.4.120.126/31 | 10.4.120.126 – 10.4.120.127 | 10.4.120.127 |
| 65 | 10.4.120.128/31 | 10.4.120.128 – 10.4.120.129 | 10.4.120.129 |
| 66 | 10.4.120.130/31 | 10.4.120.130 – 10.4.120.131 | 10.4.120.131 |
| 67 | 10.4.120.132/31 | 10.4.120.132 – 10.4.120.133 | 10.4.120.133 |
| 68 | 10.4.120.134/31 | 10.4.120.134 – 10.4.120.135 | 10.4.120.135 |
| 69 | 10.4.120.136/31 | 10.4.120.136 – 10.4.120.137 | 10.4.120.137 |
| 70 | 10.4.120.138/31 | 10.4.120.138 – 10.4.120.139 | 10.4.120.139 |
| 71 | 10.4.120.140/31 | 10.4.120.140 – 10.4.120.141 | 10.4.120.141 |
| 72 | 10.4.120.142/31 | 10.4.120.142 – 10.4.120.143 | 10.4.120.143 |
| 73 | 10.4.120.144/31 | 10.4.120.144 – 10.4.120.145 | 10.4.120.145 |
| 74 | 10.4.120.146/31 | 10.4.120.146 – 10.4.120.147 | 10.4.120.147 |
| 75 | 10.4.120.148/31 | 10.4.120.148 – 10.4.120.149 | 10.4.120.149 |
| 76 | 10.4.120.150/31 | 10.4.120.150 – 10.4.120.151 | 10.4.120.151 |
| 77 | 10.4.120.152/31 | 10.4.120.152 – 10.4.120.153 | 10.4.120.153 |
| 78 | 10.4.120.154/31 | 10.4.120.154 – 10.4.120.155 | 10.4.120.155 |
| 79 | 10.4.120.156/31 | 10.4.120.156 – 10.4.120.157 | 10.4.120.157 |
| 80 | 10.4.120.158/31 | 10.4.120.158 – 10.4.120.159 | 10.4.120.159 |
| 81 | 10.4.120.160/31 | 10.4.120.160 – 10.4.120.161 | 10.4.120.161 |
| 82 | 10.4.120.162/31 | 10.4.120.162 – 10.4.120.163 | 10.4.120.163 |
| 83 | 10.4.120.164/31 | 10.4.120.164 – 10.4.120.165 | 10.4.120.165 |
| 84 | 10.4.120.166/31 | 10.4.120.166 – 10.4.120.167 | 10.4.120.167 |
| 85 | 10.4.120.168/31 | 10.4.120.168 – 10.4.120.169 | 10.4.120.169 |
| 86 | 10.4.120.170/31 | 10.4.120.170 – 10.4.120.171 | 10.4.120.171 |
| 87 | 10.4.120.172/31 | 10.4.120.172 – 10.4.120.173 | 10.4.120.173 |
| 88 | 10.4.120.174/31 | 10.4.120.174 – 10.4.120.175 | 10.4.120.175 |
| 89 | 10.4.120.176/31 | 10.4.120.176 – 10.4.120.177 | 10.4.120.177 |
| 90 | 10.4.120.178/31 | 10.4.120.178 – 10.4.120.179 | 10.4.120.179 |
| 91 | 10.4.120.180/31 | 10.4.120.180 – 10.4.120.181 | 10.4.120.181 |
| 92 | 10.4.120.182/31 | 10.4.120.182 – 10.4.120.183 | 10.4.120.183 |
| 93 | 10.4.120.184/31 | 10.4.120.184 – 10.4.120.185 | 10.4.120.185 |
| 94 | 10.4.120.186/31 | 10.4.120.186 – 10.4.120.187 | 10.4.120.187 |
| 95 | 10.4.120.188/31 | 10.4.120.188 – 10.4.120.189 | 10.4.120.189 |
| 96 | 10.4.120.190/31 | 10.4.120.190 – 10.4.120.191 | 10.4.120.191 |
| 97 | 10.4.120.192/31 | 10.4.120.192 – 10.4.120.193 | 10.4.120.193 |
| 98 | 10.4.120.194/31 | 10.4.120.194 – 10.4.120.195 | 10.4.120.195 |
| 99 | 10.4.120.196/31 | 10.4.120.196 – 10.4.120.197 | 10.4.120.197 |
| 100 | 10.4.120.198/31 | 10.4.120.198 – 10.4.120.199 | 10.4.120.199 |
| 101 | 10.4.120.200/31 | 10.4.120.200 – 10.4.120.201 | 10.4.120.201 |
| 102 | 10.4.120.202/31 | 10.4.120.202 – 10.4.120.203 | 10.4.120.203 |
| 103 | 10.4.120.204/31 | 10.4.120.204 – 10.4.120.205 | 10.4.120.205 |
| 104 | 10.4.120.206/31 | 10.4.120.206 – 10.4.120.207 | 10.4.120.207 |
| 105 | 10.4.120.208/31 | 10.4.120.208 – 10.4.120.209 | 10.4.120.209 |
| 106 | 10.4.120.210/31 | 10.4.120.210 – 10.4.120.211 | 10.4.120.211 |
| 107 | 10.4.120.212/31 | 10.4.120.212 – 10.4.120.213 | 10.4.120.213 |
| 108 | 10.4.120.214/31 | 10.4.120.214 – 10.4.120.215 | 10.4.120.215 |
| 109 | 10.4.120.216/31 | 10.4.120.216 – 10.4.120.217 | 10.4.120.217 |
| 110 | 10.4.120.218/31 | 10.4.120.218 – 10.4.120.219 | 10.4.120.219 |
| 111 | 10.4.120.220/31 | 10.4.120.220 – 10.4.120.221 | 10.4.120.221 |
| 112 | 10.4.120.222/31 | 10.4.120.222 – 10.4.120.223 | 10.4.120.223 |
| 113 | 10.4.120.224/31 | 10.4.120.224 – 10.4.120.225 | 10.4.120.225 |
| 114 | 10.4.120.226/31 | 10.4.120.226 – 10.4.120.227 | 10.4.120.227 |
| 115 | 10.4.120.228/31 | 10.4.120.228 – 10.4.120.229 | 10.4.120.229 |
| 116 | 10.4.120.230/31 | 10.4.120.230 – 10.4.120.231 | 10.4.120.231 |
| 117 | 10.4.120.232/31 | 10.4.120.232 – 10.4.120.233 | 10.4.120.233 |
| 118 | 10.4.120.234/31 | 10.4.120.234 – 10.4.120.235 | 10.4.120.235 |
| 119 | 10.4.120.236/31 | 10.4.120.236 – 10.4.120.237 | 10.4.120.237 |
| 120 | 10.4.120.238/31 | 10.4.120.238 – 10.4.120.239 | 10.4.120.239 |
| 121 | 10.4.120.240/31 | 10.4.120.240 – 10.4.120.241 | 10.4.120.241 |
| 122 | 10.4.120.242/31 | 10.4.120.242 – 10.4.120.243 | 10.4.120.243 |
| 123 | 10.4.120.244/31 | 10.4.120.244 – 10.4.120.245 | 10.4.120.245 |
| 124 | 10.4.120.246/31 | 10.4.120.246 – 10.4.120.247 | 10.4.120.247 |
| 125 | 10.4.120.248/31 | 10.4.120.248 – 10.4.120.249 | 10.4.120.249 |
| 126 | 10.4.120.250/31 | 10.4.120.250 – 10.4.120.251 | 10.4.120.251 |
| 127 | 10.4.120.252/31 | 10.4.120.252 – 10.4.120.253 | 10.4.120.253 |
| 128 | 10.4.120.254/31 | 10.4.120.254 – 10.4.120.255 | 10.4.120.255 |
| 129 | 10.4.121.0/31 | 10.4.121.0 – 10.4.121.1 | 10.4.121.1 |
| 130 | 10.4.121.2/31 | 10.4.121.2 – 10.4.121.3 | 10.4.121.3 |
| 131 | 10.4.121.4/31 | 10.4.121.4 – 10.4.121.5 | 10.4.121.5 |
| 132 | 10.4.121.6/31 | 10.4.121.6 – 10.4.121.7 | 10.4.121.7 |
| 133 | 10.4.121.8/31 | 10.4.121.8 – 10.4.121.9 | 10.4.121.9 |
| 134 | 10.4.121.10/31 | 10.4.121.10 – 10.4.121.11 | 10.4.121.11 |
| 135 | 10.4.121.12/31 | 10.4.121.12 – 10.4.121.13 | 10.4.121.13 |
| 136 | 10.4.121.14/31 | 10.4.121.14 – 10.4.121.15 | 10.4.121.15 |
| 137 | 10.4.121.16/31 | 10.4.121.16 – 10.4.121.17 | 10.4.121.17 |
| 138 | 10.4.121.18/31 | 10.4.121.18 – 10.4.121.19 | 10.4.121.19 |
| 139 | 10.4.121.20/31 | 10.4.121.20 – 10.4.121.21 | 10.4.121.21 |
| 140 | 10.4.121.22/31 | 10.4.121.22 – 10.4.121.23 | 10.4.121.23 |
| 141 | 10.4.121.24/31 | 10.4.121.24 – 10.4.121.25 | 10.4.121.25 |
| 142 | 10.4.121.26/31 | 10.4.121.26 – 10.4.121.27 | 10.4.121.27 |
| 143 | 10.4.121.28/31 | 10.4.121.28 – 10.4.121.29 | 10.4.121.29 |
| 144 | 10.4.121.30/31 | 10.4.121.30 – 10.4.121.31 | 10.4.121.31 |
| 145 | 10.4.121.32/31 | 10.4.121.32 – 10.4.121.33 | 10.4.121.33 |
| 146 | 10.4.121.34/31 | 10.4.121.34 – 10.4.121.35 | 10.4.121.35 |
| 147 | 10.4.121.36/31 | 10.4.121.36 – 10.4.121.37 | 10.4.121.37 |
| 148 | 10.4.121.38/31 | 10.4.121.38 – 10.4.121.39 | 10.4.121.39 |
| 149 | 10.4.121.40/31 | 10.4.121.40 – 10.4.121.41 | 10.4.121.41 |
| 150 | 10.4.121.42/31 | 10.4.121.42 – 10.4.121.43 | 10.4.121.43 |
| 151 | 10.4.121.44/31 | 10.4.121.44 – 10.4.121.45 | 10.4.121.45 |
| 152 | 10.4.121.46/31 | 10.4.121.46 – 10.4.121.47 | 10.4.121.47 |
| 153 | 10.4.121.48/31 | 10.4.121.48 – 10.4.121.49 | 10.4.121.49 |
| 154 | 10.4.121.50/31 | 10.4.121.50 – 10.4.121.51 | 10.4.121.51 |
| 155 | 10.4.121.52/31 | 10.4.121.52 – 10.4.121.53 | 10.4.121.53 |
| 156 | 10.4.121.54/31 | 10.4.121.54 – 10.4.121.55 | 10.4.121.55 |
| 157 | 10.4.121.56/31 | 10.4.121.56 – 10.4.121.57 | 10.4.121.57 |
| 158 | 10.4.121.58/31 | 10.4.121.58 – 10.4.121.59 | 10.4.121.59 |
| 159 | 10.4.121.60/31 | 10.4.121.60 – 10.4.121.61 | 10.4.121.61 |
| 160 | 10.4.121.62/31 | 10.4.121.62 – 10.4.121.63 | 10.4.121.63 |
| 161 | 10.4.121.64/31 | 10.4.121.64 – 10.4.121.65 | 10.4.121.65 |
| 162 | 10.4.121.66/31 | 10.4.121.66 – 10.4.121.67 | 10.4.121.67 |
| 163 | 10.4.121.68/31 | 10.4.121.68 – 10.4.121.69 | 10.4.121.69 |
| 164 | 10.4.121.70/31 | 10.4.121.70 – 10.4.121.71 | 10.4.121.71 |
| 165 | 10.4.121.72/31 | 10.4.121.72 – 10.4.121.73 | 10.4.121.73 |
| 166 | 10.4.121.74/31 | 10.4.121.74 – 10.4.121.75 | 10.4.121.75 |
| 167 | 10.4.121.76/31 | 10.4.121.76 – 10.4.121.77 | 10.4.121.77 |
| 168 | 10.4.121.78/31 | 10.4.121.78 – 10.4.121.79 | 10.4.121.79 |
| 169 | 10.4.121.80/31 | 10.4.121.80 – 10.4.121.81 | 10.4.121.81 |
| 170 | 10.4.121.82/31 | 10.4.121.82 – 10.4.121.83 | 10.4.121.83 |
| 171 | 10.4.121.84/31 | 10.4.121.84 – 10.4.121.85 | 10.4.121.85 |
| 172 | 10.4.121.86/31 | 10.4.121.86 – 10.4.121.87 | 10.4.121.87 |
| 173 | 10.4.121.88/31 | 10.4.121.88 – 10.4.121.89 | 10.4.121.89 |
| 174 | 10.4.121.90/31 | 10.4.121.90 – 10.4.121.91 | 10.4.121.91 |
| 175 | 10.4.121.92/31 | 10.4.121.92 – 10.4.121.93 | 10.4.121.93 |
| 176 | 10.4.121.94/31 | 10.4.121.94 – 10.4.121.95 | 10.4.121.95 |
| 177 | 10.4.121.96/31 | 10.4.121.96 – 10.4.121.97 | 10.4.121.97 |
| 178 | 10.4.121.98/31 | 10.4.121.98 – 10.4.121.99 | 10.4.121.99 |
| 179 | 10.4.121.100/31 | 10.4.121.100 – 10.4.121.101 | 10.4.121.101 |
| 180 | 10.4.121.102/31 | 10.4.121.102 – 10.4.121.103 | 10.4.121.103 |
| 181 | 10.4.121.104/31 | 10.4.121.104 – 10.4.121.105 | 10.4.121.105 |
| 182 | 10.4.121.106/31 | 10.4.121.106 – 10.4.121.107 | 10.4.121.107 |
| 183 | 10.4.121.108/31 | 10.4.121.108 – 10.4.121.109 | 10.4.121.109 |
| 184 | 10.4.121.110/31 | 10.4.121.110 – 10.4.121.111 | 10.4.121.111 |
| 185 | 10.4.121.112/31 | 10.4.121.112 – 10.4.121.113 | 10.4.121.113 |
| 186 | 10.4.121.114/31 | 10.4.121.114 – 10.4.121.115 | 10.4.121.115 |
| 187 | 10.4.121.116/31 | 10.4.121.116 – 10.4.121.117 | 10.4.121.117 |
| 188 | 10.4.121.118/31 | 10.4.121.118 – 10.4.121.119 | 10.4.121.119 |
| 189 | 10.4.121.120/31 | 10.4.121.120 – 10.4.121.121 | 10.4.121.121 |
| 190 | 10.4.121.122/31 | 10.4.121.122 – 10.4.121.123 | 10.4.121.123 |
| 191 | 10.4.121.124/31 | 10.4.121.124 – 10.4.121.125 | 10.4.121.125 |
| 192 | 10.4.121.126/31 | 10.4.121.126 – 10.4.121.127 | 10.4.121.127 |
| 193 | 10.4.121.128/31 | 10.4.121.128 – 10.4.121.129 | 10.4.121.129 |
| 194 | 10.4.121.130/31 | 10.4.121.130 – 10.4.121.131 | 10.4.121.131 |
| 195 | 10.4.121.132/31 | 10.4.121.132 – 10.4.121.133 | 10.4.121.133 |
| 196 | 10.4.121.134/31 | 10.4.121.134 – 10.4.121.135 | 10.4.121.135 |
| 197 | 10.4.121.136/31 | 10.4.121.136 – 10.4.121.137 | 10.4.121.137 |
| 198 | 10.4.121.138/31 | 10.4.121.138 – 10.4.121.139 | 10.4.121.139 |
| 199 | 10.4.121.140/31 | 10.4.121.140 – 10.4.121.141 | 10.4.121.141 |
| 200 | 10.4.121.142/31 | 10.4.121.142 – 10.4.121.143 | 10.4.121.143 |
| 201 | 10.4.121.144/31 | 10.4.121.144 – 10.4.121.145 | 10.4.121.145 |
| 202 | 10.4.121.146/31 | 10.4.121.146 – 10.4.121.147 | 10.4.121.147 |
| 203 | 10.4.121.148/31 | 10.4.121.148 – 10.4.121.149 | 10.4.121.149 |
| 204 | 10.4.121.150/31 | 10.4.121.150 – 10.4.121.151 | 10.4.121.151 |
| 205 | 10.4.121.152/31 | 10.4.121.152 – 10.4.121.153 | 10.4.121.153 |
| 206 | 10.4.121.154/31 | 10.4.121.154 – 10.4.121.155 | 10.4.121.155 |
| 207 | 10.4.121.156/31 | 10.4.121.156 – 10.4.121.157 | 10.4.121.157 |
| 208 | 10.4.121.158/31 | 10.4.121.158 – 10.4.121.159 | 10.4.121.159 |
| 209 | 10.4.121.160/31 | 10.4.121.160 – 10.4.121.161 | 10.4.121.161 |
| 210 | 10.4.121.162/31 | 10.4.121.162 – 10.4.121.163 | 10.4.121.163 |
| 211 | 10.4.121.164/31 | 10.4.121.164 – 10.4.121.165 | 10.4.121.165 |
| 212 | 10.4.121.166/31 | 10.4.121.166 – 10.4.121.167 | 10.4.121.167 |
| 213 | 10.4.121.168/31 | 10.4.121.168 – 10.4.121.169 | 10.4.121.169 |
| 214 | 10.4.121.170/31 | 10.4.121.170 – 10.4.121.171 | 10.4.121.171 |
| 215 | 10.4.121.172/31 | 10.4.121.172 – 10.4.121.173 | 10.4.121.173 |
| 216 | 10.4.121.174/31 | 10.4.121.174 – 10.4.121.175 | 10.4.121.175 |
| 217 | 10.4.121.176/31 | 10.4.121.176 – 10.4.121.177 | 10.4.121.177 |
| 218 | 10.4.121.178/31 | 10.4.121.178 – 10.4.121.179 | 10.4.121.179 |
| 219 | 10.4.121.180/31 | 10.4.121.180 – 10.4.121.181 | 10.4.121.181 |
| 220 | 10.4.121.182/31 | 10.4.121.182 – 10.4.121.183 | 10.4.121.183 |
| 221 | 10.4.121.184/31 | 10.4.121.184 – 10.4.121.185 | 10.4.121.185 |
| 222 | 10.4.121.186/31 | 10.4.121.186 – 10.4.121.187 | 10.4.121.187 |
| 223 | 10.4.121.188/31 | 10.4.121.188 – 10.4.121.189 | 10.4.121.189 |
| 224 | 10.4.121.190/31 | 10.4.121.190 – 10.4.121.191 | 10.4.121.191 |
| 225 | 10.4.121.192/31 | 10.4.121.192 – 10.4.121.193 | 10.4.121.193 |
| 226 | 10.4.121.194/31 | 10.4.121.194 – 10.4.121.195 | 10.4.121.195 |
| 227 | 10.4.121.196/31 | 10.4.121.196 – 10.4.121.197 | 10.4.121.197 |
| 228 | 10.4.121.198/31 | 10.4.121.198 – 10.4.121.199 | 10.4.121.199 |
| 229 | 10.4.121.200/31 | 10.4.121.200 – 10.4.121.201 | 10.4.121.201 |
| 230 | 10.4.121.202/31 | 10.4.121.202 – 10.4.121.203 | 10.4.121.203 |
| 231 | 10.4.121.204/31 | 10.4.121.204 – 10.4.121.205 | 10.4.121.205 |
| 232 | 10.4.121.206/31 | 10.4.121.206 – 10.4.121.207 | 10.4.121.207 |
| 233 | 10.4.121.208/31 | 10.4.121.208 – 10.4.121.209 | 10.4.121.209 |
| 234 | 10.4.121.210/31 | 10.4.121.210 – 10.4.121.211 | 10.4.121.211 |
| 235 | 10.4.121.212/31 | 10.4.121.212 – 10.4.121.213 | 10.4.121.213 |
| 236 | 10.4.121.214/31 | 10.4.121.214 – 10.4.121.215 | 10.4.121.215 |
| 237 | 10.4.121.216/31 | 10.4.121.216 – 10.4.121.217 | 10.4.121.217 |
| 238 | 10.4.121.218/31 | 10.4.121.218 – 10.4.121.219 | 10.4.121.219 |
| 239 | 10.4.121.220/31 | 10.4.121.220 – 10.4.121.221 | 10.4.121.221 |
| 240 | 10.4.121.222/31 | 10.4.121.222 – 10.4.121.223 | 10.4.121.223 |
| 241 | 10.4.121.224/31 | 10.4.121.224 – 10.4.121.225 | 10.4.121.225 |
| 242 | 10.4.121.226/31 | 10.4.121.226 – 10.4.121.227 | 10.4.121.227 |
| 243 | 10.4.121.228/31 | 10.4.121.228 – 10.4.121.229 | 10.4.121.229 |
| 244 | 10.4.121.230/31 | 10.4.121.230 – 10.4.121.231 | 10.4.121.231 |
| 245 | 10.4.121.232/31 | 10.4.121.232 – 10.4.121.233 | 10.4.121.233 |
| 246 | 10.4.121.234/31 | 10.4.121.234 – 10.4.121.235 | 10.4.121.235 |
| 247 | 10.4.121.236/31 | 10.4.121.236 – 10.4.121.237 | 10.4.121.237 |
| 248 | 10.4.121.238/31 | 10.4.121.238 – 10.4.121.239 | 10.4.121.239 |
| 249 | 10.4.121.240/31 | 10.4.121.240 – 10.4.121.241 | 10.4.121.241 |
| 250 | 10.4.121.242/31 | 10.4.121.242 – 10.4.121.243 | 10.4.121.243 |
| 251 | 10.4.121.244/31 | 10.4.121.244 – 10.4.121.245 | 10.4.121.245 |
| 252 | 10.4.121.246/31 | 10.4.121.246 – 10.4.121.247 | 10.4.121.247 |
| 253 | 10.4.121.248/31 | 10.4.121.248 – 10.4.121.249 | 10.4.121.249 |
| 254 | 10.4.121.250/31 | 10.4.121.250 – 10.4.121.251 | 10.4.121.251 |
| 255 | 10.4.121.252/31 | 10.4.121.252 – 10.4.121.253 | 10.4.121.253 |
| 256 | 10.4.121.254/31 | 10.4.121.254 – 10.4.121.255 | 10.4.121.255 |
showing 256 of 1,024
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.