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)172.16.8.0/21
network172.16.8.0/21
broadcast172.16.15.255
first host172.16.8.1
last host172.16.15.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classB
ipcalc 172.16.8.0/21
address10101100.00010000.00001000.00000000
subnet mask11111111.11111111.11111000.00000000
network10101100.00010000.00001000.00000000
broadcast10101100.00010000.00001111.11111111
green = network part, grey = host part
hex0xac100800
decimal2886731776
reverse dns0.8.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:800
/21 split into /30 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.8.0/30 | 172.16.8.1 – 172.16.8.2 | 172.16.8.3 |
| 2 | 172.16.8.4/30 | 172.16.8.5 – 172.16.8.6 | 172.16.8.7 |
| 3 | 172.16.8.8/30 | 172.16.8.9 – 172.16.8.10 | 172.16.8.11 |
| 4 | 172.16.8.12/30 | 172.16.8.13 – 172.16.8.14 | 172.16.8.15 |
| 5 | 172.16.8.16/30 | 172.16.8.17 – 172.16.8.18 | 172.16.8.19 |
| 6 | 172.16.8.20/30 | 172.16.8.21 – 172.16.8.22 | 172.16.8.23 |
| 7 | 172.16.8.24/30 | 172.16.8.25 – 172.16.8.26 | 172.16.8.27 |
| 8 | 172.16.8.28/30 | 172.16.8.29 – 172.16.8.30 | 172.16.8.31 |
| 9 | 172.16.8.32/30 | 172.16.8.33 – 172.16.8.34 | 172.16.8.35 |
| 10 | 172.16.8.36/30 | 172.16.8.37 – 172.16.8.38 | 172.16.8.39 |
| 11 | 172.16.8.40/30 | 172.16.8.41 – 172.16.8.42 | 172.16.8.43 |
| 12 | 172.16.8.44/30 | 172.16.8.45 – 172.16.8.46 | 172.16.8.47 |
| 13 | 172.16.8.48/30 | 172.16.8.49 – 172.16.8.50 | 172.16.8.51 |
| 14 | 172.16.8.52/30 | 172.16.8.53 – 172.16.8.54 | 172.16.8.55 |
| 15 | 172.16.8.56/30 | 172.16.8.57 – 172.16.8.58 | 172.16.8.59 |
| 16 | 172.16.8.60/30 | 172.16.8.61 – 172.16.8.62 | 172.16.8.63 |
| 17 | 172.16.8.64/30 | 172.16.8.65 – 172.16.8.66 | 172.16.8.67 |
| 18 | 172.16.8.68/30 | 172.16.8.69 – 172.16.8.70 | 172.16.8.71 |
| 19 | 172.16.8.72/30 | 172.16.8.73 – 172.16.8.74 | 172.16.8.75 |
| 20 | 172.16.8.76/30 | 172.16.8.77 – 172.16.8.78 | 172.16.8.79 |
| 21 | 172.16.8.80/30 | 172.16.8.81 – 172.16.8.82 | 172.16.8.83 |
| 22 | 172.16.8.84/30 | 172.16.8.85 – 172.16.8.86 | 172.16.8.87 |
| 23 | 172.16.8.88/30 | 172.16.8.89 – 172.16.8.90 | 172.16.8.91 |
| 24 | 172.16.8.92/30 | 172.16.8.93 – 172.16.8.94 | 172.16.8.95 |
| 25 | 172.16.8.96/30 | 172.16.8.97 – 172.16.8.98 | 172.16.8.99 |
| 26 | 172.16.8.100/30 | 172.16.8.101 – 172.16.8.102 | 172.16.8.103 |
| 27 | 172.16.8.104/30 | 172.16.8.105 – 172.16.8.106 | 172.16.8.107 |
| 28 | 172.16.8.108/30 | 172.16.8.109 – 172.16.8.110 | 172.16.8.111 |
| 29 | 172.16.8.112/30 | 172.16.8.113 – 172.16.8.114 | 172.16.8.115 |
| 30 | 172.16.8.116/30 | 172.16.8.117 – 172.16.8.118 | 172.16.8.119 |
| 31 | 172.16.8.120/30 | 172.16.8.121 – 172.16.8.122 | 172.16.8.123 |
| 32 | 172.16.8.124/30 | 172.16.8.125 – 172.16.8.126 | 172.16.8.127 |
| 33 | 172.16.8.128/30 | 172.16.8.129 – 172.16.8.130 | 172.16.8.131 |
| 34 | 172.16.8.132/30 | 172.16.8.133 – 172.16.8.134 | 172.16.8.135 |
| 35 | 172.16.8.136/30 | 172.16.8.137 – 172.16.8.138 | 172.16.8.139 |
| 36 | 172.16.8.140/30 | 172.16.8.141 – 172.16.8.142 | 172.16.8.143 |
| 37 | 172.16.8.144/30 | 172.16.8.145 – 172.16.8.146 | 172.16.8.147 |
| 38 | 172.16.8.148/30 | 172.16.8.149 – 172.16.8.150 | 172.16.8.151 |
| 39 | 172.16.8.152/30 | 172.16.8.153 – 172.16.8.154 | 172.16.8.155 |
| 40 | 172.16.8.156/30 | 172.16.8.157 – 172.16.8.158 | 172.16.8.159 |
| 41 | 172.16.8.160/30 | 172.16.8.161 – 172.16.8.162 | 172.16.8.163 |
| 42 | 172.16.8.164/30 | 172.16.8.165 – 172.16.8.166 | 172.16.8.167 |
| 43 | 172.16.8.168/30 | 172.16.8.169 – 172.16.8.170 | 172.16.8.171 |
| 44 | 172.16.8.172/30 | 172.16.8.173 – 172.16.8.174 | 172.16.8.175 |
| 45 | 172.16.8.176/30 | 172.16.8.177 – 172.16.8.178 | 172.16.8.179 |
| 46 | 172.16.8.180/30 | 172.16.8.181 – 172.16.8.182 | 172.16.8.183 |
| 47 | 172.16.8.184/30 | 172.16.8.185 – 172.16.8.186 | 172.16.8.187 |
| 48 | 172.16.8.188/30 | 172.16.8.189 – 172.16.8.190 | 172.16.8.191 |
| 49 | 172.16.8.192/30 | 172.16.8.193 – 172.16.8.194 | 172.16.8.195 |
| 50 | 172.16.8.196/30 | 172.16.8.197 – 172.16.8.198 | 172.16.8.199 |
| 51 | 172.16.8.200/30 | 172.16.8.201 – 172.16.8.202 | 172.16.8.203 |
| 52 | 172.16.8.204/30 | 172.16.8.205 – 172.16.8.206 | 172.16.8.207 |
| 53 | 172.16.8.208/30 | 172.16.8.209 – 172.16.8.210 | 172.16.8.211 |
| 54 | 172.16.8.212/30 | 172.16.8.213 – 172.16.8.214 | 172.16.8.215 |
| 55 | 172.16.8.216/30 | 172.16.8.217 – 172.16.8.218 | 172.16.8.219 |
| 56 | 172.16.8.220/30 | 172.16.8.221 – 172.16.8.222 | 172.16.8.223 |
| 57 | 172.16.8.224/30 | 172.16.8.225 – 172.16.8.226 | 172.16.8.227 |
| 58 | 172.16.8.228/30 | 172.16.8.229 – 172.16.8.230 | 172.16.8.231 |
| 59 | 172.16.8.232/30 | 172.16.8.233 – 172.16.8.234 | 172.16.8.235 |
| 60 | 172.16.8.236/30 | 172.16.8.237 – 172.16.8.238 | 172.16.8.239 |
| 61 | 172.16.8.240/30 | 172.16.8.241 – 172.16.8.242 | 172.16.8.243 |
| 62 | 172.16.8.244/30 | 172.16.8.245 – 172.16.8.246 | 172.16.8.247 |
| 63 | 172.16.8.248/30 | 172.16.8.249 – 172.16.8.250 | 172.16.8.251 |
| 64 | 172.16.8.252/30 | 172.16.8.253 – 172.16.8.254 | 172.16.8.255 |
| 65 | 172.16.9.0/30 | 172.16.9.1 – 172.16.9.2 | 172.16.9.3 |
| 66 | 172.16.9.4/30 | 172.16.9.5 – 172.16.9.6 | 172.16.9.7 |
| 67 | 172.16.9.8/30 | 172.16.9.9 – 172.16.9.10 | 172.16.9.11 |
| 68 | 172.16.9.12/30 | 172.16.9.13 – 172.16.9.14 | 172.16.9.15 |
| 69 | 172.16.9.16/30 | 172.16.9.17 – 172.16.9.18 | 172.16.9.19 |
| 70 | 172.16.9.20/30 | 172.16.9.21 – 172.16.9.22 | 172.16.9.23 |
| 71 | 172.16.9.24/30 | 172.16.9.25 – 172.16.9.26 | 172.16.9.27 |
| 72 | 172.16.9.28/30 | 172.16.9.29 – 172.16.9.30 | 172.16.9.31 |
| 73 | 172.16.9.32/30 | 172.16.9.33 – 172.16.9.34 | 172.16.9.35 |
| 74 | 172.16.9.36/30 | 172.16.9.37 – 172.16.9.38 | 172.16.9.39 |
| 75 | 172.16.9.40/30 | 172.16.9.41 – 172.16.9.42 | 172.16.9.43 |
| 76 | 172.16.9.44/30 | 172.16.9.45 – 172.16.9.46 | 172.16.9.47 |
| 77 | 172.16.9.48/30 | 172.16.9.49 – 172.16.9.50 | 172.16.9.51 |
| 78 | 172.16.9.52/30 | 172.16.9.53 – 172.16.9.54 | 172.16.9.55 |
| 79 | 172.16.9.56/30 | 172.16.9.57 – 172.16.9.58 | 172.16.9.59 |
| 80 | 172.16.9.60/30 | 172.16.9.61 – 172.16.9.62 | 172.16.9.63 |
| 81 | 172.16.9.64/30 | 172.16.9.65 – 172.16.9.66 | 172.16.9.67 |
| 82 | 172.16.9.68/30 | 172.16.9.69 – 172.16.9.70 | 172.16.9.71 |
| 83 | 172.16.9.72/30 | 172.16.9.73 – 172.16.9.74 | 172.16.9.75 |
| 84 | 172.16.9.76/30 | 172.16.9.77 – 172.16.9.78 | 172.16.9.79 |
| 85 | 172.16.9.80/30 | 172.16.9.81 – 172.16.9.82 | 172.16.9.83 |
| 86 | 172.16.9.84/30 | 172.16.9.85 – 172.16.9.86 | 172.16.9.87 |
| 87 | 172.16.9.88/30 | 172.16.9.89 – 172.16.9.90 | 172.16.9.91 |
| 88 | 172.16.9.92/30 | 172.16.9.93 – 172.16.9.94 | 172.16.9.95 |
| 89 | 172.16.9.96/30 | 172.16.9.97 – 172.16.9.98 | 172.16.9.99 |
| 90 | 172.16.9.100/30 | 172.16.9.101 – 172.16.9.102 | 172.16.9.103 |
| 91 | 172.16.9.104/30 | 172.16.9.105 – 172.16.9.106 | 172.16.9.107 |
| 92 | 172.16.9.108/30 | 172.16.9.109 – 172.16.9.110 | 172.16.9.111 |
| 93 | 172.16.9.112/30 | 172.16.9.113 – 172.16.9.114 | 172.16.9.115 |
| 94 | 172.16.9.116/30 | 172.16.9.117 – 172.16.9.118 | 172.16.9.119 |
| 95 | 172.16.9.120/30 | 172.16.9.121 – 172.16.9.122 | 172.16.9.123 |
| 96 | 172.16.9.124/30 | 172.16.9.125 – 172.16.9.126 | 172.16.9.127 |
| 97 | 172.16.9.128/30 | 172.16.9.129 – 172.16.9.130 | 172.16.9.131 |
| 98 | 172.16.9.132/30 | 172.16.9.133 – 172.16.9.134 | 172.16.9.135 |
| 99 | 172.16.9.136/30 | 172.16.9.137 – 172.16.9.138 | 172.16.9.139 |
| 100 | 172.16.9.140/30 | 172.16.9.141 – 172.16.9.142 | 172.16.9.143 |
| 101 | 172.16.9.144/30 | 172.16.9.145 – 172.16.9.146 | 172.16.9.147 |
| 102 | 172.16.9.148/30 | 172.16.9.149 – 172.16.9.150 | 172.16.9.151 |
| 103 | 172.16.9.152/30 | 172.16.9.153 – 172.16.9.154 | 172.16.9.155 |
| 104 | 172.16.9.156/30 | 172.16.9.157 – 172.16.9.158 | 172.16.9.159 |
| 105 | 172.16.9.160/30 | 172.16.9.161 – 172.16.9.162 | 172.16.9.163 |
| 106 | 172.16.9.164/30 | 172.16.9.165 – 172.16.9.166 | 172.16.9.167 |
| 107 | 172.16.9.168/30 | 172.16.9.169 – 172.16.9.170 | 172.16.9.171 |
| 108 | 172.16.9.172/30 | 172.16.9.173 – 172.16.9.174 | 172.16.9.175 |
| 109 | 172.16.9.176/30 | 172.16.9.177 – 172.16.9.178 | 172.16.9.179 |
| 110 | 172.16.9.180/30 | 172.16.9.181 – 172.16.9.182 | 172.16.9.183 |
| 111 | 172.16.9.184/30 | 172.16.9.185 – 172.16.9.186 | 172.16.9.187 |
| 112 | 172.16.9.188/30 | 172.16.9.189 – 172.16.9.190 | 172.16.9.191 |
| 113 | 172.16.9.192/30 | 172.16.9.193 – 172.16.9.194 | 172.16.9.195 |
| 114 | 172.16.9.196/30 | 172.16.9.197 – 172.16.9.198 | 172.16.9.199 |
| 115 | 172.16.9.200/30 | 172.16.9.201 – 172.16.9.202 | 172.16.9.203 |
| 116 | 172.16.9.204/30 | 172.16.9.205 – 172.16.9.206 | 172.16.9.207 |
| 117 | 172.16.9.208/30 | 172.16.9.209 – 172.16.9.210 | 172.16.9.211 |
| 118 | 172.16.9.212/30 | 172.16.9.213 – 172.16.9.214 | 172.16.9.215 |
| 119 | 172.16.9.216/30 | 172.16.9.217 – 172.16.9.218 | 172.16.9.219 |
| 120 | 172.16.9.220/30 | 172.16.9.221 – 172.16.9.222 | 172.16.9.223 |
| 121 | 172.16.9.224/30 | 172.16.9.225 – 172.16.9.226 | 172.16.9.227 |
| 122 | 172.16.9.228/30 | 172.16.9.229 – 172.16.9.230 | 172.16.9.231 |
| 123 | 172.16.9.232/30 | 172.16.9.233 – 172.16.9.234 | 172.16.9.235 |
| 124 | 172.16.9.236/30 | 172.16.9.237 – 172.16.9.238 | 172.16.9.239 |
| 125 | 172.16.9.240/30 | 172.16.9.241 – 172.16.9.242 | 172.16.9.243 |
| 126 | 172.16.9.244/30 | 172.16.9.245 – 172.16.9.246 | 172.16.9.247 |
| 127 | 172.16.9.248/30 | 172.16.9.249 – 172.16.9.250 | 172.16.9.251 |
| 128 | 172.16.9.252/30 | 172.16.9.253 – 172.16.9.254 | 172.16.9.255 |
| 129 | 172.16.10.0/30 | 172.16.10.1 – 172.16.10.2 | 172.16.10.3 |
| 130 | 172.16.10.4/30 | 172.16.10.5 – 172.16.10.6 | 172.16.10.7 |
| 131 | 172.16.10.8/30 | 172.16.10.9 – 172.16.10.10 | 172.16.10.11 |
| 132 | 172.16.10.12/30 | 172.16.10.13 – 172.16.10.14 | 172.16.10.15 |
| 133 | 172.16.10.16/30 | 172.16.10.17 – 172.16.10.18 | 172.16.10.19 |
| 134 | 172.16.10.20/30 | 172.16.10.21 – 172.16.10.22 | 172.16.10.23 |
| 135 | 172.16.10.24/30 | 172.16.10.25 – 172.16.10.26 | 172.16.10.27 |
| 136 | 172.16.10.28/30 | 172.16.10.29 – 172.16.10.30 | 172.16.10.31 |
| 137 | 172.16.10.32/30 | 172.16.10.33 – 172.16.10.34 | 172.16.10.35 |
| 138 | 172.16.10.36/30 | 172.16.10.37 – 172.16.10.38 | 172.16.10.39 |
| 139 | 172.16.10.40/30 | 172.16.10.41 – 172.16.10.42 | 172.16.10.43 |
| 140 | 172.16.10.44/30 | 172.16.10.45 – 172.16.10.46 | 172.16.10.47 |
| 141 | 172.16.10.48/30 | 172.16.10.49 – 172.16.10.50 | 172.16.10.51 |
| 142 | 172.16.10.52/30 | 172.16.10.53 – 172.16.10.54 | 172.16.10.55 |
| 143 | 172.16.10.56/30 | 172.16.10.57 – 172.16.10.58 | 172.16.10.59 |
| 144 | 172.16.10.60/30 | 172.16.10.61 – 172.16.10.62 | 172.16.10.63 |
| 145 | 172.16.10.64/30 | 172.16.10.65 – 172.16.10.66 | 172.16.10.67 |
| 146 | 172.16.10.68/30 | 172.16.10.69 – 172.16.10.70 | 172.16.10.71 |
| 147 | 172.16.10.72/30 | 172.16.10.73 – 172.16.10.74 | 172.16.10.75 |
| 148 | 172.16.10.76/30 | 172.16.10.77 – 172.16.10.78 | 172.16.10.79 |
| 149 | 172.16.10.80/30 | 172.16.10.81 – 172.16.10.82 | 172.16.10.83 |
| 150 | 172.16.10.84/30 | 172.16.10.85 – 172.16.10.86 | 172.16.10.87 |
| 151 | 172.16.10.88/30 | 172.16.10.89 – 172.16.10.90 | 172.16.10.91 |
| 152 | 172.16.10.92/30 | 172.16.10.93 – 172.16.10.94 | 172.16.10.95 |
| 153 | 172.16.10.96/30 | 172.16.10.97 – 172.16.10.98 | 172.16.10.99 |
| 154 | 172.16.10.100/30 | 172.16.10.101 – 172.16.10.102 | 172.16.10.103 |
| 155 | 172.16.10.104/30 | 172.16.10.105 – 172.16.10.106 | 172.16.10.107 |
| 156 | 172.16.10.108/30 | 172.16.10.109 – 172.16.10.110 | 172.16.10.111 |
| 157 | 172.16.10.112/30 | 172.16.10.113 – 172.16.10.114 | 172.16.10.115 |
| 158 | 172.16.10.116/30 | 172.16.10.117 – 172.16.10.118 | 172.16.10.119 |
| 159 | 172.16.10.120/30 | 172.16.10.121 – 172.16.10.122 | 172.16.10.123 |
| 160 | 172.16.10.124/30 | 172.16.10.125 – 172.16.10.126 | 172.16.10.127 |
| 161 | 172.16.10.128/30 | 172.16.10.129 – 172.16.10.130 | 172.16.10.131 |
| 162 | 172.16.10.132/30 | 172.16.10.133 – 172.16.10.134 | 172.16.10.135 |
| 163 | 172.16.10.136/30 | 172.16.10.137 – 172.16.10.138 | 172.16.10.139 |
| 164 | 172.16.10.140/30 | 172.16.10.141 – 172.16.10.142 | 172.16.10.143 |
| 165 | 172.16.10.144/30 | 172.16.10.145 – 172.16.10.146 | 172.16.10.147 |
| 166 | 172.16.10.148/30 | 172.16.10.149 – 172.16.10.150 | 172.16.10.151 |
| 167 | 172.16.10.152/30 | 172.16.10.153 – 172.16.10.154 | 172.16.10.155 |
| 168 | 172.16.10.156/30 | 172.16.10.157 – 172.16.10.158 | 172.16.10.159 |
| 169 | 172.16.10.160/30 | 172.16.10.161 – 172.16.10.162 | 172.16.10.163 |
| 170 | 172.16.10.164/30 | 172.16.10.165 – 172.16.10.166 | 172.16.10.167 |
| 171 | 172.16.10.168/30 | 172.16.10.169 – 172.16.10.170 | 172.16.10.171 |
| 172 | 172.16.10.172/30 | 172.16.10.173 – 172.16.10.174 | 172.16.10.175 |
| 173 | 172.16.10.176/30 | 172.16.10.177 – 172.16.10.178 | 172.16.10.179 |
| 174 | 172.16.10.180/30 | 172.16.10.181 – 172.16.10.182 | 172.16.10.183 |
| 175 | 172.16.10.184/30 | 172.16.10.185 – 172.16.10.186 | 172.16.10.187 |
| 176 | 172.16.10.188/30 | 172.16.10.189 – 172.16.10.190 | 172.16.10.191 |
| 177 | 172.16.10.192/30 | 172.16.10.193 – 172.16.10.194 | 172.16.10.195 |
| 178 | 172.16.10.196/30 | 172.16.10.197 – 172.16.10.198 | 172.16.10.199 |
| 179 | 172.16.10.200/30 | 172.16.10.201 – 172.16.10.202 | 172.16.10.203 |
| 180 | 172.16.10.204/30 | 172.16.10.205 – 172.16.10.206 | 172.16.10.207 |
| 181 | 172.16.10.208/30 | 172.16.10.209 – 172.16.10.210 | 172.16.10.211 |
| 182 | 172.16.10.212/30 | 172.16.10.213 – 172.16.10.214 | 172.16.10.215 |
| 183 | 172.16.10.216/30 | 172.16.10.217 – 172.16.10.218 | 172.16.10.219 |
| 184 | 172.16.10.220/30 | 172.16.10.221 – 172.16.10.222 | 172.16.10.223 |
| 185 | 172.16.10.224/30 | 172.16.10.225 – 172.16.10.226 | 172.16.10.227 |
| 186 | 172.16.10.228/30 | 172.16.10.229 – 172.16.10.230 | 172.16.10.231 |
| 187 | 172.16.10.232/30 | 172.16.10.233 – 172.16.10.234 | 172.16.10.235 |
| 188 | 172.16.10.236/30 | 172.16.10.237 – 172.16.10.238 | 172.16.10.239 |
| 189 | 172.16.10.240/30 | 172.16.10.241 – 172.16.10.242 | 172.16.10.243 |
| 190 | 172.16.10.244/30 | 172.16.10.245 – 172.16.10.246 | 172.16.10.247 |
| 191 | 172.16.10.248/30 | 172.16.10.249 – 172.16.10.250 | 172.16.10.251 |
| 192 | 172.16.10.252/30 | 172.16.10.253 – 172.16.10.254 | 172.16.10.255 |
| 193 | 172.16.11.0/30 | 172.16.11.1 – 172.16.11.2 | 172.16.11.3 |
| 194 | 172.16.11.4/30 | 172.16.11.5 – 172.16.11.6 | 172.16.11.7 |
| 195 | 172.16.11.8/30 | 172.16.11.9 – 172.16.11.10 | 172.16.11.11 |
| 196 | 172.16.11.12/30 | 172.16.11.13 – 172.16.11.14 | 172.16.11.15 |
| 197 | 172.16.11.16/30 | 172.16.11.17 – 172.16.11.18 | 172.16.11.19 |
| 198 | 172.16.11.20/30 | 172.16.11.21 – 172.16.11.22 | 172.16.11.23 |
| 199 | 172.16.11.24/30 | 172.16.11.25 – 172.16.11.26 | 172.16.11.27 |
| 200 | 172.16.11.28/30 | 172.16.11.29 – 172.16.11.30 | 172.16.11.31 |
| 201 | 172.16.11.32/30 | 172.16.11.33 – 172.16.11.34 | 172.16.11.35 |
| 202 | 172.16.11.36/30 | 172.16.11.37 – 172.16.11.38 | 172.16.11.39 |
| 203 | 172.16.11.40/30 | 172.16.11.41 – 172.16.11.42 | 172.16.11.43 |
| 204 | 172.16.11.44/30 | 172.16.11.45 – 172.16.11.46 | 172.16.11.47 |
| 205 | 172.16.11.48/30 | 172.16.11.49 – 172.16.11.50 | 172.16.11.51 |
| 206 | 172.16.11.52/30 | 172.16.11.53 – 172.16.11.54 | 172.16.11.55 |
| 207 | 172.16.11.56/30 | 172.16.11.57 – 172.16.11.58 | 172.16.11.59 |
| 208 | 172.16.11.60/30 | 172.16.11.61 – 172.16.11.62 | 172.16.11.63 |
| 209 | 172.16.11.64/30 | 172.16.11.65 – 172.16.11.66 | 172.16.11.67 |
| 210 | 172.16.11.68/30 | 172.16.11.69 – 172.16.11.70 | 172.16.11.71 |
| 211 | 172.16.11.72/30 | 172.16.11.73 – 172.16.11.74 | 172.16.11.75 |
| 212 | 172.16.11.76/30 | 172.16.11.77 – 172.16.11.78 | 172.16.11.79 |
| 213 | 172.16.11.80/30 | 172.16.11.81 – 172.16.11.82 | 172.16.11.83 |
| 214 | 172.16.11.84/30 | 172.16.11.85 – 172.16.11.86 | 172.16.11.87 |
| 215 | 172.16.11.88/30 | 172.16.11.89 – 172.16.11.90 | 172.16.11.91 |
| 216 | 172.16.11.92/30 | 172.16.11.93 – 172.16.11.94 | 172.16.11.95 |
| 217 | 172.16.11.96/30 | 172.16.11.97 – 172.16.11.98 | 172.16.11.99 |
| 218 | 172.16.11.100/30 | 172.16.11.101 – 172.16.11.102 | 172.16.11.103 |
| 219 | 172.16.11.104/30 | 172.16.11.105 – 172.16.11.106 | 172.16.11.107 |
| 220 | 172.16.11.108/30 | 172.16.11.109 – 172.16.11.110 | 172.16.11.111 |
| 221 | 172.16.11.112/30 | 172.16.11.113 – 172.16.11.114 | 172.16.11.115 |
| 222 | 172.16.11.116/30 | 172.16.11.117 – 172.16.11.118 | 172.16.11.119 |
| 223 | 172.16.11.120/30 | 172.16.11.121 – 172.16.11.122 | 172.16.11.123 |
| 224 | 172.16.11.124/30 | 172.16.11.125 – 172.16.11.126 | 172.16.11.127 |
| 225 | 172.16.11.128/30 | 172.16.11.129 – 172.16.11.130 | 172.16.11.131 |
| 226 | 172.16.11.132/30 | 172.16.11.133 – 172.16.11.134 | 172.16.11.135 |
| 227 | 172.16.11.136/30 | 172.16.11.137 – 172.16.11.138 | 172.16.11.139 |
| 228 | 172.16.11.140/30 | 172.16.11.141 – 172.16.11.142 | 172.16.11.143 |
| 229 | 172.16.11.144/30 | 172.16.11.145 – 172.16.11.146 | 172.16.11.147 |
| 230 | 172.16.11.148/30 | 172.16.11.149 – 172.16.11.150 | 172.16.11.151 |
| 231 | 172.16.11.152/30 | 172.16.11.153 – 172.16.11.154 | 172.16.11.155 |
| 232 | 172.16.11.156/30 | 172.16.11.157 – 172.16.11.158 | 172.16.11.159 |
| 233 | 172.16.11.160/30 | 172.16.11.161 – 172.16.11.162 | 172.16.11.163 |
| 234 | 172.16.11.164/30 | 172.16.11.165 – 172.16.11.166 | 172.16.11.167 |
| 235 | 172.16.11.168/30 | 172.16.11.169 – 172.16.11.170 | 172.16.11.171 |
| 236 | 172.16.11.172/30 | 172.16.11.173 – 172.16.11.174 | 172.16.11.175 |
| 237 | 172.16.11.176/30 | 172.16.11.177 – 172.16.11.178 | 172.16.11.179 |
| 238 | 172.16.11.180/30 | 172.16.11.181 – 172.16.11.182 | 172.16.11.183 |
| 239 | 172.16.11.184/30 | 172.16.11.185 – 172.16.11.186 | 172.16.11.187 |
| 240 | 172.16.11.188/30 | 172.16.11.189 – 172.16.11.190 | 172.16.11.191 |
| 241 | 172.16.11.192/30 | 172.16.11.193 – 172.16.11.194 | 172.16.11.195 |
| 242 | 172.16.11.196/30 | 172.16.11.197 – 172.16.11.198 | 172.16.11.199 |
| 243 | 172.16.11.200/30 | 172.16.11.201 – 172.16.11.202 | 172.16.11.203 |
| 244 | 172.16.11.204/30 | 172.16.11.205 – 172.16.11.206 | 172.16.11.207 |
| 245 | 172.16.11.208/30 | 172.16.11.209 – 172.16.11.210 | 172.16.11.211 |
| 246 | 172.16.11.212/30 | 172.16.11.213 – 172.16.11.214 | 172.16.11.215 |
| 247 | 172.16.11.216/30 | 172.16.11.217 – 172.16.11.218 | 172.16.11.219 |
| 248 | 172.16.11.220/30 | 172.16.11.221 – 172.16.11.222 | 172.16.11.223 |
| 249 | 172.16.11.224/30 | 172.16.11.225 – 172.16.11.226 | 172.16.11.227 |
| 250 | 172.16.11.228/30 | 172.16.11.229 – 172.16.11.230 | 172.16.11.231 |
| 251 | 172.16.11.232/30 | 172.16.11.233 – 172.16.11.234 | 172.16.11.235 |
| 252 | 172.16.11.236/30 | 172.16.11.237 – 172.16.11.238 | 172.16.11.239 |
| 253 | 172.16.11.240/30 | 172.16.11.241 – 172.16.11.242 | 172.16.11.243 |
| 254 | 172.16.11.244/30 | 172.16.11.245 – 172.16.11.246 | 172.16.11.247 |
| 255 | 172.16.11.248/30 | 172.16.11.249 – 172.16.11.250 | 172.16.11.251 |
| 256 | 172.16.11.252/30 | 172.16.11.253 – 172.16.11.254 | 172.16.11.255 |
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.