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 /31 · 1,024 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.8.0/31 | 172.16.8.0 – 172.16.8.1 | 172.16.8.1 |
| 2 | 172.16.8.2/31 | 172.16.8.2 – 172.16.8.3 | 172.16.8.3 |
| 3 | 172.16.8.4/31 | 172.16.8.4 – 172.16.8.5 | 172.16.8.5 |
| 4 | 172.16.8.6/31 | 172.16.8.6 – 172.16.8.7 | 172.16.8.7 |
| 5 | 172.16.8.8/31 | 172.16.8.8 – 172.16.8.9 | 172.16.8.9 |
| 6 | 172.16.8.10/31 | 172.16.8.10 – 172.16.8.11 | 172.16.8.11 |
| 7 | 172.16.8.12/31 | 172.16.8.12 – 172.16.8.13 | 172.16.8.13 |
| 8 | 172.16.8.14/31 | 172.16.8.14 – 172.16.8.15 | 172.16.8.15 |
| 9 | 172.16.8.16/31 | 172.16.8.16 – 172.16.8.17 | 172.16.8.17 |
| 10 | 172.16.8.18/31 | 172.16.8.18 – 172.16.8.19 | 172.16.8.19 |
| 11 | 172.16.8.20/31 | 172.16.8.20 – 172.16.8.21 | 172.16.8.21 |
| 12 | 172.16.8.22/31 | 172.16.8.22 – 172.16.8.23 | 172.16.8.23 |
| 13 | 172.16.8.24/31 | 172.16.8.24 – 172.16.8.25 | 172.16.8.25 |
| 14 | 172.16.8.26/31 | 172.16.8.26 – 172.16.8.27 | 172.16.8.27 |
| 15 | 172.16.8.28/31 | 172.16.8.28 – 172.16.8.29 | 172.16.8.29 |
| 16 | 172.16.8.30/31 | 172.16.8.30 – 172.16.8.31 | 172.16.8.31 |
| 17 | 172.16.8.32/31 | 172.16.8.32 – 172.16.8.33 | 172.16.8.33 |
| 18 | 172.16.8.34/31 | 172.16.8.34 – 172.16.8.35 | 172.16.8.35 |
| 19 | 172.16.8.36/31 | 172.16.8.36 – 172.16.8.37 | 172.16.8.37 |
| 20 | 172.16.8.38/31 | 172.16.8.38 – 172.16.8.39 | 172.16.8.39 |
| 21 | 172.16.8.40/31 | 172.16.8.40 – 172.16.8.41 | 172.16.8.41 |
| 22 | 172.16.8.42/31 | 172.16.8.42 – 172.16.8.43 | 172.16.8.43 |
| 23 | 172.16.8.44/31 | 172.16.8.44 – 172.16.8.45 | 172.16.8.45 |
| 24 | 172.16.8.46/31 | 172.16.8.46 – 172.16.8.47 | 172.16.8.47 |
| 25 | 172.16.8.48/31 | 172.16.8.48 – 172.16.8.49 | 172.16.8.49 |
| 26 | 172.16.8.50/31 | 172.16.8.50 – 172.16.8.51 | 172.16.8.51 |
| 27 | 172.16.8.52/31 | 172.16.8.52 – 172.16.8.53 | 172.16.8.53 |
| 28 | 172.16.8.54/31 | 172.16.8.54 – 172.16.8.55 | 172.16.8.55 |
| 29 | 172.16.8.56/31 | 172.16.8.56 – 172.16.8.57 | 172.16.8.57 |
| 30 | 172.16.8.58/31 | 172.16.8.58 – 172.16.8.59 | 172.16.8.59 |
| 31 | 172.16.8.60/31 | 172.16.8.60 – 172.16.8.61 | 172.16.8.61 |
| 32 | 172.16.8.62/31 | 172.16.8.62 – 172.16.8.63 | 172.16.8.63 |
| 33 | 172.16.8.64/31 | 172.16.8.64 – 172.16.8.65 | 172.16.8.65 |
| 34 | 172.16.8.66/31 | 172.16.8.66 – 172.16.8.67 | 172.16.8.67 |
| 35 | 172.16.8.68/31 | 172.16.8.68 – 172.16.8.69 | 172.16.8.69 |
| 36 | 172.16.8.70/31 | 172.16.8.70 – 172.16.8.71 | 172.16.8.71 |
| 37 | 172.16.8.72/31 | 172.16.8.72 – 172.16.8.73 | 172.16.8.73 |
| 38 | 172.16.8.74/31 | 172.16.8.74 – 172.16.8.75 | 172.16.8.75 |
| 39 | 172.16.8.76/31 | 172.16.8.76 – 172.16.8.77 | 172.16.8.77 |
| 40 | 172.16.8.78/31 | 172.16.8.78 – 172.16.8.79 | 172.16.8.79 |
| 41 | 172.16.8.80/31 | 172.16.8.80 – 172.16.8.81 | 172.16.8.81 |
| 42 | 172.16.8.82/31 | 172.16.8.82 – 172.16.8.83 | 172.16.8.83 |
| 43 | 172.16.8.84/31 | 172.16.8.84 – 172.16.8.85 | 172.16.8.85 |
| 44 | 172.16.8.86/31 | 172.16.8.86 – 172.16.8.87 | 172.16.8.87 |
| 45 | 172.16.8.88/31 | 172.16.8.88 – 172.16.8.89 | 172.16.8.89 |
| 46 | 172.16.8.90/31 | 172.16.8.90 – 172.16.8.91 | 172.16.8.91 |
| 47 | 172.16.8.92/31 | 172.16.8.92 – 172.16.8.93 | 172.16.8.93 |
| 48 | 172.16.8.94/31 | 172.16.8.94 – 172.16.8.95 | 172.16.8.95 |
| 49 | 172.16.8.96/31 | 172.16.8.96 – 172.16.8.97 | 172.16.8.97 |
| 50 | 172.16.8.98/31 | 172.16.8.98 – 172.16.8.99 | 172.16.8.99 |
| 51 | 172.16.8.100/31 | 172.16.8.100 – 172.16.8.101 | 172.16.8.101 |
| 52 | 172.16.8.102/31 | 172.16.8.102 – 172.16.8.103 | 172.16.8.103 |
| 53 | 172.16.8.104/31 | 172.16.8.104 – 172.16.8.105 | 172.16.8.105 |
| 54 | 172.16.8.106/31 | 172.16.8.106 – 172.16.8.107 | 172.16.8.107 |
| 55 | 172.16.8.108/31 | 172.16.8.108 – 172.16.8.109 | 172.16.8.109 |
| 56 | 172.16.8.110/31 | 172.16.8.110 – 172.16.8.111 | 172.16.8.111 |
| 57 | 172.16.8.112/31 | 172.16.8.112 – 172.16.8.113 | 172.16.8.113 |
| 58 | 172.16.8.114/31 | 172.16.8.114 – 172.16.8.115 | 172.16.8.115 |
| 59 | 172.16.8.116/31 | 172.16.8.116 – 172.16.8.117 | 172.16.8.117 |
| 60 | 172.16.8.118/31 | 172.16.8.118 – 172.16.8.119 | 172.16.8.119 |
| 61 | 172.16.8.120/31 | 172.16.8.120 – 172.16.8.121 | 172.16.8.121 |
| 62 | 172.16.8.122/31 | 172.16.8.122 – 172.16.8.123 | 172.16.8.123 |
| 63 | 172.16.8.124/31 | 172.16.8.124 – 172.16.8.125 | 172.16.8.125 |
| 64 | 172.16.8.126/31 | 172.16.8.126 – 172.16.8.127 | 172.16.8.127 |
| 65 | 172.16.8.128/31 | 172.16.8.128 – 172.16.8.129 | 172.16.8.129 |
| 66 | 172.16.8.130/31 | 172.16.8.130 – 172.16.8.131 | 172.16.8.131 |
| 67 | 172.16.8.132/31 | 172.16.8.132 – 172.16.8.133 | 172.16.8.133 |
| 68 | 172.16.8.134/31 | 172.16.8.134 – 172.16.8.135 | 172.16.8.135 |
| 69 | 172.16.8.136/31 | 172.16.8.136 – 172.16.8.137 | 172.16.8.137 |
| 70 | 172.16.8.138/31 | 172.16.8.138 – 172.16.8.139 | 172.16.8.139 |
| 71 | 172.16.8.140/31 | 172.16.8.140 – 172.16.8.141 | 172.16.8.141 |
| 72 | 172.16.8.142/31 | 172.16.8.142 – 172.16.8.143 | 172.16.8.143 |
| 73 | 172.16.8.144/31 | 172.16.8.144 – 172.16.8.145 | 172.16.8.145 |
| 74 | 172.16.8.146/31 | 172.16.8.146 – 172.16.8.147 | 172.16.8.147 |
| 75 | 172.16.8.148/31 | 172.16.8.148 – 172.16.8.149 | 172.16.8.149 |
| 76 | 172.16.8.150/31 | 172.16.8.150 – 172.16.8.151 | 172.16.8.151 |
| 77 | 172.16.8.152/31 | 172.16.8.152 – 172.16.8.153 | 172.16.8.153 |
| 78 | 172.16.8.154/31 | 172.16.8.154 – 172.16.8.155 | 172.16.8.155 |
| 79 | 172.16.8.156/31 | 172.16.8.156 – 172.16.8.157 | 172.16.8.157 |
| 80 | 172.16.8.158/31 | 172.16.8.158 – 172.16.8.159 | 172.16.8.159 |
| 81 | 172.16.8.160/31 | 172.16.8.160 – 172.16.8.161 | 172.16.8.161 |
| 82 | 172.16.8.162/31 | 172.16.8.162 – 172.16.8.163 | 172.16.8.163 |
| 83 | 172.16.8.164/31 | 172.16.8.164 – 172.16.8.165 | 172.16.8.165 |
| 84 | 172.16.8.166/31 | 172.16.8.166 – 172.16.8.167 | 172.16.8.167 |
| 85 | 172.16.8.168/31 | 172.16.8.168 – 172.16.8.169 | 172.16.8.169 |
| 86 | 172.16.8.170/31 | 172.16.8.170 – 172.16.8.171 | 172.16.8.171 |
| 87 | 172.16.8.172/31 | 172.16.8.172 – 172.16.8.173 | 172.16.8.173 |
| 88 | 172.16.8.174/31 | 172.16.8.174 – 172.16.8.175 | 172.16.8.175 |
| 89 | 172.16.8.176/31 | 172.16.8.176 – 172.16.8.177 | 172.16.8.177 |
| 90 | 172.16.8.178/31 | 172.16.8.178 – 172.16.8.179 | 172.16.8.179 |
| 91 | 172.16.8.180/31 | 172.16.8.180 – 172.16.8.181 | 172.16.8.181 |
| 92 | 172.16.8.182/31 | 172.16.8.182 – 172.16.8.183 | 172.16.8.183 |
| 93 | 172.16.8.184/31 | 172.16.8.184 – 172.16.8.185 | 172.16.8.185 |
| 94 | 172.16.8.186/31 | 172.16.8.186 – 172.16.8.187 | 172.16.8.187 |
| 95 | 172.16.8.188/31 | 172.16.8.188 – 172.16.8.189 | 172.16.8.189 |
| 96 | 172.16.8.190/31 | 172.16.8.190 – 172.16.8.191 | 172.16.8.191 |
| 97 | 172.16.8.192/31 | 172.16.8.192 – 172.16.8.193 | 172.16.8.193 |
| 98 | 172.16.8.194/31 | 172.16.8.194 – 172.16.8.195 | 172.16.8.195 |
| 99 | 172.16.8.196/31 | 172.16.8.196 – 172.16.8.197 | 172.16.8.197 |
| 100 | 172.16.8.198/31 | 172.16.8.198 – 172.16.8.199 | 172.16.8.199 |
| 101 | 172.16.8.200/31 | 172.16.8.200 – 172.16.8.201 | 172.16.8.201 |
| 102 | 172.16.8.202/31 | 172.16.8.202 – 172.16.8.203 | 172.16.8.203 |
| 103 | 172.16.8.204/31 | 172.16.8.204 – 172.16.8.205 | 172.16.8.205 |
| 104 | 172.16.8.206/31 | 172.16.8.206 – 172.16.8.207 | 172.16.8.207 |
| 105 | 172.16.8.208/31 | 172.16.8.208 – 172.16.8.209 | 172.16.8.209 |
| 106 | 172.16.8.210/31 | 172.16.8.210 – 172.16.8.211 | 172.16.8.211 |
| 107 | 172.16.8.212/31 | 172.16.8.212 – 172.16.8.213 | 172.16.8.213 |
| 108 | 172.16.8.214/31 | 172.16.8.214 – 172.16.8.215 | 172.16.8.215 |
| 109 | 172.16.8.216/31 | 172.16.8.216 – 172.16.8.217 | 172.16.8.217 |
| 110 | 172.16.8.218/31 | 172.16.8.218 – 172.16.8.219 | 172.16.8.219 |
| 111 | 172.16.8.220/31 | 172.16.8.220 – 172.16.8.221 | 172.16.8.221 |
| 112 | 172.16.8.222/31 | 172.16.8.222 – 172.16.8.223 | 172.16.8.223 |
| 113 | 172.16.8.224/31 | 172.16.8.224 – 172.16.8.225 | 172.16.8.225 |
| 114 | 172.16.8.226/31 | 172.16.8.226 – 172.16.8.227 | 172.16.8.227 |
| 115 | 172.16.8.228/31 | 172.16.8.228 – 172.16.8.229 | 172.16.8.229 |
| 116 | 172.16.8.230/31 | 172.16.8.230 – 172.16.8.231 | 172.16.8.231 |
| 117 | 172.16.8.232/31 | 172.16.8.232 – 172.16.8.233 | 172.16.8.233 |
| 118 | 172.16.8.234/31 | 172.16.8.234 – 172.16.8.235 | 172.16.8.235 |
| 119 | 172.16.8.236/31 | 172.16.8.236 – 172.16.8.237 | 172.16.8.237 |
| 120 | 172.16.8.238/31 | 172.16.8.238 – 172.16.8.239 | 172.16.8.239 |
| 121 | 172.16.8.240/31 | 172.16.8.240 – 172.16.8.241 | 172.16.8.241 |
| 122 | 172.16.8.242/31 | 172.16.8.242 – 172.16.8.243 | 172.16.8.243 |
| 123 | 172.16.8.244/31 | 172.16.8.244 – 172.16.8.245 | 172.16.8.245 |
| 124 | 172.16.8.246/31 | 172.16.8.246 – 172.16.8.247 | 172.16.8.247 |
| 125 | 172.16.8.248/31 | 172.16.8.248 – 172.16.8.249 | 172.16.8.249 |
| 126 | 172.16.8.250/31 | 172.16.8.250 – 172.16.8.251 | 172.16.8.251 |
| 127 | 172.16.8.252/31 | 172.16.8.252 – 172.16.8.253 | 172.16.8.253 |
| 128 | 172.16.8.254/31 | 172.16.8.254 – 172.16.8.255 | 172.16.8.255 |
| 129 | 172.16.9.0/31 | 172.16.9.0 – 172.16.9.1 | 172.16.9.1 |
| 130 | 172.16.9.2/31 | 172.16.9.2 – 172.16.9.3 | 172.16.9.3 |
| 131 | 172.16.9.4/31 | 172.16.9.4 – 172.16.9.5 | 172.16.9.5 |
| 132 | 172.16.9.6/31 | 172.16.9.6 – 172.16.9.7 | 172.16.9.7 |
| 133 | 172.16.9.8/31 | 172.16.9.8 – 172.16.9.9 | 172.16.9.9 |
| 134 | 172.16.9.10/31 | 172.16.9.10 – 172.16.9.11 | 172.16.9.11 |
| 135 | 172.16.9.12/31 | 172.16.9.12 – 172.16.9.13 | 172.16.9.13 |
| 136 | 172.16.9.14/31 | 172.16.9.14 – 172.16.9.15 | 172.16.9.15 |
| 137 | 172.16.9.16/31 | 172.16.9.16 – 172.16.9.17 | 172.16.9.17 |
| 138 | 172.16.9.18/31 | 172.16.9.18 – 172.16.9.19 | 172.16.9.19 |
| 139 | 172.16.9.20/31 | 172.16.9.20 – 172.16.9.21 | 172.16.9.21 |
| 140 | 172.16.9.22/31 | 172.16.9.22 – 172.16.9.23 | 172.16.9.23 |
| 141 | 172.16.9.24/31 | 172.16.9.24 – 172.16.9.25 | 172.16.9.25 |
| 142 | 172.16.9.26/31 | 172.16.9.26 – 172.16.9.27 | 172.16.9.27 |
| 143 | 172.16.9.28/31 | 172.16.9.28 – 172.16.9.29 | 172.16.9.29 |
| 144 | 172.16.9.30/31 | 172.16.9.30 – 172.16.9.31 | 172.16.9.31 |
| 145 | 172.16.9.32/31 | 172.16.9.32 – 172.16.9.33 | 172.16.9.33 |
| 146 | 172.16.9.34/31 | 172.16.9.34 – 172.16.9.35 | 172.16.9.35 |
| 147 | 172.16.9.36/31 | 172.16.9.36 – 172.16.9.37 | 172.16.9.37 |
| 148 | 172.16.9.38/31 | 172.16.9.38 – 172.16.9.39 | 172.16.9.39 |
| 149 | 172.16.9.40/31 | 172.16.9.40 – 172.16.9.41 | 172.16.9.41 |
| 150 | 172.16.9.42/31 | 172.16.9.42 – 172.16.9.43 | 172.16.9.43 |
| 151 | 172.16.9.44/31 | 172.16.9.44 – 172.16.9.45 | 172.16.9.45 |
| 152 | 172.16.9.46/31 | 172.16.9.46 – 172.16.9.47 | 172.16.9.47 |
| 153 | 172.16.9.48/31 | 172.16.9.48 – 172.16.9.49 | 172.16.9.49 |
| 154 | 172.16.9.50/31 | 172.16.9.50 – 172.16.9.51 | 172.16.9.51 |
| 155 | 172.16.9.52/31 | 172.16.9.52 – 172.16.9.53 | 172.16.9.53 |
| 156 | 172.16.9.54/31 | 172.16.9.54 – 172.16.9.55 | 172.16.9.55 |
| 157 | 172.16.9.56/31 | 172.16.9.56 – 172.16.9.57 | 172.16.9.57 |
| 158 | 172.16.9.58/31 | 172.16.9.58 – 172.16.9.59 | 172.16.9.59 |
| 159 | 172.16.9.60/31 | 172.16.9.60 – 172.16.9.61 | 172.16.9.61 |
| 160 | 172.16.9.62/31 | 172.16.9.62 – 172.16.9.63 | 172.16.9.63 |
| 161 | 172.16.9.64/31 | 172.16.9.64 – 172.16.9.65 | 172.16.9.65 |
| 162 | 172.16.9.66/31 | 172.16.9.66 – 172.16.9.67 | 172.16.9.67 |
| 163 | 172.16.9.68/31 | 172.16.9.68 – 172.16.9.69 | 172.16.9.69 |
| 164 | 172.16.9.70/31 | 172.16.9.70 – 172.16.9.71 | 172.16.9.71 |
| 165 | 172.16.9.72/31 | 172.16.9.72 – 172.16.9.73 | 172.16.9.73 |
| 166 | 172.16.9.74/31 | 172.16.9.74 – 172.16.9.75 | 172.16.9.75 |
| 167 | 172.16.9.76/31 | 172.16.9.76 – 172.16.9.77 | 172.16.9.77 |
| 168 | 172.16.9.78/31 | 172.16.9.78 – 172.16.9.79 | 172.16.9.79 |
| 169 | 172.16.9.80/31 | 172.16.9.80 – 172.16.9.81 | 172.16.9.81 |
| 170 | 172.16.9.82/31 | 172.16.9.82 – 172.16.9.83 | 172.16.9.83 |
| 171 | 172.16.9.84/31 | 172.16.9.84 – 172.16.9.85 | 172.16.9.85 |
| 172 | 172.16.9.86/31 | 172.16.9.86 – 172.16.9.87 | 172.16.9.87 |
| 173 | 172.16.9.88/31 | 172.16.9.88 – 172.16.9.89 | 172.16.9.89 |
| 174 | 172.16.9.90/31 | 172.16.9.90 – 172.16.9.91 | 172.16.9.91 |
| 175 | 172.16.9.92/31 | 172.16.9.92 – 172.16.9.93 | 172.16.9.93 |
| 176 | 172.16.9.94/31 | 172.16.9.94 – 172.16.9.95 | 172.16.9.95 |
| 177 | 172.16.9.96/31 | 172.16.9.96 – 172.16.9.97 | 172.16.9.97 |
| 178 | 172.16.9.98/31 | 172.16.9.98 – 172.16.9.99 | 172.16.9.99 |
| 179 | 172.16.9.100/31 | 172.16.9.100 – 172.16.9.101 | 172.16.9.101 |
| 180 | 172.16.9.102/31 | 172.16.9.102 – 172.16.9.103 | 172.16.9.103 |
| 181 | 172.16.9.104/31 | 172.16.9.104 – 172.16.9.105 | 172.16.9.105 |
| 182 | 172.16.9.106/31 | 172.16.9.106 – 172.16.9.107 | 172.16.9.107 |
| 183 | 172.16.9.108/31 | 172.16.9.108 – 172.16.9.109 | 172.16.9.109 |
| 184 | 172.16.9.110/31 | 172.16.9.110 – 172.16.9.111 | 172.16.9.111 |
| 185 | 172.16.9.112/31 | 172.16.9.112 – 172.16.9.113 | 172.16.9.113 |
| 186 | 172.16.9.114/31 | 172.16.9.114 – 172.16.9.115 | 172.16.9.115 |
| 187 | 172.16.9.116/31 | 172.16.9.116 – 172.16.9.117 | 172.16.9.117 |
| 188 | 172.16.9.118/31 | 172.16.9.118 – 172.16.9.119 | 172.16.9.119 |
| 189 | 172.16.9.120/31 | 172.16.9.120 – 172.16.9.121 | 172.16.9.121 |
| 190 | 172.16.9.122/31 | 172.16.9.122 – 172.16.9.123 | 172.16.9.123 |
| 191 | 172.16.9.124/31 | 172.16.9.124 – 172.16.9.125 | 172.16.9.125 |
| 192 | 172.16.9.126/31 | 172.16.9.126 – 172.16.9.127 | 172.16.9.127 |
| 193 | 172.16.9.128/31 | 172.16.9.128 – 172.16.9.129 | 172.16.9.129 |
| 194 | 172.16.9.130/31 | 172.16.9.130 – 172.16.9.131 | 172.16.9.131 |
| 195 | 172.16.9.132/31 | 172.16.9.132 – 172.16.9.133 | 172.16.9.133 |
| 196 | 172.16.9.134/31 | 172.16.9.134 – 172.16.9.135 | 172.16.9.135 |
| 197 | 172.16.9.136/31 | 172.16.9.136 – 172.16.9.137 | 172.16.9.137 |
| 198 | 172.16.9.138/31 | 172.16.9.138 – 172.16.9.139 | 172.16.9.139 |
| 199 | 172.16.9.140/31 | 172.16.9.140 – 172.16.9.141 | 172.16.9.141 |
| 200 | 172.16.9.142/31 | 172.16.9.142 – 172.16.9.143 | 172.16.9.143 |
| 201 | 172.16.9.144/31 | 172.16.9.144 – 172.16.9.145 | 172.16.9.145 |
| 202 | 172.16.9.146/31 | 172.16.9.146 – 172.16.9.147 | 172.16.9.147 |
| 203 | 172.16.9.148/31 | 172.16.9.148 – 172.16.9.149 | 172.16.9.149 |
| 204 | 172.16.9.150/31 | 172.16.9.150 – 172.16.9.151 | 172.16.9.151 |
| 205 | 172.16.9.152/31 | 172.16.9.152 – 172.16.9.153 | 172.16.9.153 |
| 206 | 172.16.9.154/31 | 172.16.9.154 – 172.16.9.155 | 172.16.9.155 |
| 207 | 172.16.9.156/31 | 172.16.9.156 – 172.16.9.157 | 172.16.9.157 |
| 208 | 172.16.9.158/31 | 172.16.9.158 – 172.16.9.159 | 172.16.9.159 |
| 209 | 172.16.9.160/31 | 172.16.9.160 – 172.16.9.161 | 172.16.9.161 |
| 210 | 172.16.9.162/31 | 172.16.9.162 – 172.16.9.163 | 172.16.9.163 |
| 211 | 172.16.9.164/31 | 172.16.9.164 – 172.16.9.165 | 172.16.9.165 |
| 212 | 172.16.9.166/31 | 172.16.9.166 – 172.16.9.167 | 172.16.9.167 |
| 213 | 172.16.9.168/31 | 172.16.9.168 – 172.16.9.169 | 172.16.9.169 |
| 214 | 172.16.9.170/31 | 172.16.9.170 – 172.16.9.171 | 172.16.9.171 |
| 215 | 172.16.9.172/31 | 172.16.9.172 – 172.16.9.173 | 172.16.9.173 |
| 216 | 172.16.9.174/31 | 172.16.9.174 – 172.16.9.175 | 172.16.9.175 |
| 217 | 172.16.9.176/31 | 172.16.9.176 – 172.16.9.177 | 172.16.9.177 |
| 218 | 172.16.9.178/31 | 172.16.9.178 – 172.16.9.179 | 172.16.9.179 |
| 219 | 172.16.9.180/31 | 172.16.9.180 – 172.16.9.181 | 172.16.9.181 |
| 220 | 172.16.9.182/31 | 172.16.9.182 – 172.16.9.183 | 172.16.9.183 |
| 221 | 172.16.9.184/31 | 172.16.9.184 – 172.16.9.185 | 172.16.9.185 |
| 222 | 172.16.9.186/31 | 172.16.9.186 – 172.16.9.187 | 172.16.9.187 |
| 223 | 172.16.9.188/31 | 172.16.9.188 – 172.16.9.189 | 172.16.9.189 |
| 224 | 172.16.9.190/31 | 172.16.9.190 – 172.16.9.191 | 172.16.9.191 |
| 225 | 172.16.9.192/31 | 172.16.9.192 – 172.16.9.193 | 172.16.9.193 |
| 226 | 172.16.9.194/31 | 172.16.9.194 – 172.16.9.195 | 172.16.9.195 |
| 227 | 172.16.9.196/31 | 172.16.9.196 – 172.16.9.197 | 172.16.9.197 |
| 228 | 172.16.9.198/31 | 172.16.9.198 – 172.16.9.199 | 172.16.9.199 |
| 229 | 172.16.9.200/31 | 172.16.9.200 – 172.16.9.201 | 172.16.9.201 |
| 230 | 172.16.9.202/31 | 172.16.9.202 – 172.16.9.203 | 172.16.9.203 |
| 231 | 172.16.9.204/31 | 172.16.9.204 – 172.16.9.205 | 172.16.9.205 |
| 232 | 172.16.9.206/31 | 172.16.9.206 – 172.16.9.207 | 172.16.9.207 |
| 233 | 172.16.9.208/31 | 172.16.9.208 – 172.16.9.209 | 172.16.9.209 |
| 234 | 172.16.9.210/31 | 172.16.9.210 – 172.16.9.211 | 172.16.9.211 |
| 235 | 172.16.9.212/31 | 172.16.9.212 – 172.16.9.213 | 172.16.9.213 |
| 236 | 172.16.9.214/31 | 172.16.9.214 – 172.16.9.215 | 172.16.9.215 |
| 237 | 172.16.9.216/31 | 172.16.9.216 – 172.16.9.217 | 172.16.9.217 |
| 238 | 172.16.9.218/31 | 172.16.9.218 – 172.16.9.219 | 172.16.9.219 |
| 239 | 172.16.9.220/31 | 172.16.9.220 – 172.16.9.221 | 172.16.9.221 |
| 240 | 172.16.9.222/31 | 172.16.9.222 – 172.16.9.223 | 172.16.9.223 |
| 241 | 172.16.9.224/31 | 172.16.9.224 – 172.16.9.225 | 172.16.9.225 |
| 242 | 172.16.9.226/31 | 172.16.9.226 – 172.16.9.227 | 172.16.9.227 |
| 243 | 172.16.9.228/31 | 172.16.9.228 – 172.16.9.229 | 172.16.9.229 |
| 244 | 172.16.9.230/31 | 172.16.9.230 – 172.16.9.231 | 172.16.9.231 |
| 245 | 172.16.9.232/31 | 172.16.9.232 – 172.16.9.233 | 172.16.9.233 |
| 246 | 172.16.9.234/31 | 172.16.9.234 – 172.16.9.235 | 172.16.9.235 |
| 247 | 172.16.9.236/31 | 172.16.9.236 – 172.16.9.237 | 172.16.9.237 |
| 248 | 172.16.9.238/31 | 172.16.9.238 – 172.16.9.239 | 172.16.9.239 |
| 249 | 172.16.9.240/31 | 172.16.9.240 – 172.16.9.241 | 172.16.9.241 |
| 250 | 172.16.9.242/31 | 172.16.9.242 – 172.16.9.243 | 172.16.9.243 |
| 251 | 172.16.9.244/31 | 172.16.9.244 – 172.16.9.245 | 172.16.9.245 |
| 252 | 172.16.9.246/31 | 172.16.9.246 – 172.16.9.247 | 172.16.9.247 |
| 253 | 172.16.9.248/31 | 172.16.9.248 – 172.16.9.249 | 172.16.9.249 |
| 254 | 172.16.9.250/31 | 172.16.9.250 – 172.16.9.251 | 172.16.9.251 |
| 255 | 172.16.9.252/31 | 172.16.9.252 – 172.16.9.253 | 172.16.9.253 |
| 256 | 172.16.9.254/31 | 172.16.9.254 – 172.16.9.255 | 172.16.9.255 |
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.