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)10.21.192.0/18
network10.21.192.0/18
broadcast10.21.255.255
first host10.21.192.1
last host10.21.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.21.192.0/18
address00001010.00010101.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010101.11000000.00000000
broadcast00001010.00010101.11111111.11111111
green = network part, grey = host part
hex0x0a15c000
decimal169197568
reverse dns0.192.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:c000
/18 split into /27 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.192.0/27 | 10.21.192.1 – 10.21.192.30 | 10.21.192.31 |
| 2 | 10.21.192.32/27 | 10.21.192.33 – 10.21.192.62 | 10.21.192.63 |
| 3 | 10.21.192.64/27 | 10.21.192.65 – 10.21.192.94 | 10.21.192.95 |
| 4 | 10.21.192.96/27 | 10.21.192.97 – 10.21.192.126 | 10.21.192.127 |
| 5 | 10.21.192.128/27 | 10.21.192.129 – 10.21.192.158 | 10.21.192.159 |
| 6 | 10.21.192.160/27 | 10.21.192.161 – 10.21.192.190 | 10.21.192.191 |
| 7 | 10.21.192.192/27 | 10.21.192.193 – 10.21.192.222 | 10.21.192.223 |
| 8 | 10.21.192.224/27 | 10.21.192.225 – 10.21.192.254 | 10.21.192.255 |
| 9 | 10.21.193.0/27 | 10.21.193.1 – 10.21.193.30 | 10.21.193.31 |
| 10 | 10.21.193.32/27 | 10.21.193.33 – 10.21.193.62 | 10.21.193.63 |
| 11 | 10.21.193.64/27 | 10.21.193.65 – 10.21.193.94 | 10.21.193.95 |
| 12 | 10.21.193.96/27 | 10.21.193.97 – 10.21.193.126 | 10.21.193.127 |
| 13 | 10.21.193.128/27 | 10.21.193.129 – 10.21.193.158 | 10.21.193.159 |
| 14 | 10.21.193.160/27 | 10.21.193.161 – 10.21.193.190 | 10.21.193.191 |
| 15 | 10.21.193.192/27 | 10.21.193.193 – 10.21.193.222 | 10.21.193.223 |
| 16 | 10.21.193.224/27 | 10.21.193.225 – 10.21.193.254 | 10.21.193.255 |
| 17 | 10.21.194.0/27 | 10.21.194.1 – 10.21.194.30 | 10.21.194.31 |
| 18 | 10.21.194.32/27 | 10.21.194.33 – 10.21.194.62 | 10.21.194.63 |
| 19 | 10.21.194.64/27 | 10.21.194.65 – 10.21.194.94 | 10.21.194.95 |
| 20 | 10.21.194.96/27 | 10.21.194.97 – 10.21.194.126 | 10.21.194.127 |
| 21 | 10.21.194.128/27 | 10.21.194.129 – 10.21.194.158 | 10.21.194.159 |
| 22 | 10.21.194.160/27 | 10.21.194.161 – 10.21.194.190 | 10.21.194.191 |
| 23 | 10.21.194.192/27 | 10.21.194.193 – 10.21.194.222 | 10.21.194.223 |
| 24 | 10.21.194.224/27 | 10.21.194.225 – 10.21.194.254 | 10.21.194.255 |
| 25 | 10.21.195.0/27 | 10.21.195.1 – 10.21.195.30 | 10.21.195.31 |
| 26 | 10.21.195.32/27 | 10.21.195.33 – 10.21.195.62 | 10.21.195.63 |
| 27 | 10.21.195.64/27 | 10.21.195.65 – 10.21.195.94 | 10.21.195.95 |
| 28 | 10.21.195.96/27 | 10.21.195.97 – 10.21.195.126 | 10.21.195.127 |
| 29 | 10.21.195.128/27 | 10.21.195.129 – 10.21.195.158 | 10.21.195.159 |
| 30 | 10.21.195.160/27 | 10.21.195.161 – 10.21.195.190 | 10.21.195.191 |
| 31 | 10.21.195.192/27 | 10.21.195.193 – 10.21.195.222 | 10.21.195.223 |
| 32 | 10.21.195.224/27 | 10.21.195.225 – 10.21.195.254 | 10.21.195.255 |
| 33 | 10.21.196.0/27 | 10.21.196.1 – 10.21.196.30 | 10.21.196.31 |
| 34 | 10.21.196.32/27 | 10.21.196.33 – 10.21.196.62 | 10.21.196.63 |
| 35 | 10.21.196.64/27 | 10.21.196.65 – 10.21.196.94 | 10.21.196.95 |
| 36 | 10.21.196.96/27 | 10.21.196.97 – 10.21.196.126 | 10.21.196.127 |
| 37 | 10.21.196.128/27 | 10.21.196.129 – 10.21.196.158 | 10.21.196.159 |
| 38 | 10.21.196.160/27 | 10.21.196.161 – 10.21.196.190 | 10.21.196.191 |
| 39 | 10.21.196.192/27 | 10.21.196.193 – 10.21.196.222 | 10.21.196.223 |
| 40 | 10.21.196.224/27 | 10.21.196.225 – 10.21.196.254 | 10.21.196.255 |
| 41 | 10.21.197.0/27 | 10.21.197.1 – 10.21.197.30 | 10.21.197.31 |
| 42 | 10.21.197.32/27 | 10.21.197.33 – 10.21.197.62 | 10.21.197.63 |
| 43 | 10.21.197.64/27 | 10.21.197.65 – 10.21.197.94 | 10.21.197.95 |
| 44 | 10.21.197.96/27 | 10.21.197.97 – 10.21.197.126 | 10.21.197.127 |
| 45 | 10.21.197.128/27 | 10.21.197.129 – 10.21.197.158 | 10.21.197.159 |
| 46 | 10.21.197.160/27 | 10.21.197.161 – 10.21.197.190 | 10.21.197.191 |
| 47 | 10.21.197.192/27 | 10.21.197.193 – 10.21.197.222 | 10.21.197.223 |
| 48 | 10.21.197.224/27 | 10.21.197.225 – 10.21.197.254 | 10.21.197.255 |
| 49 | 10.21.198.0/27 | 10.21.198.1 – 10.21.198.30 | 10.21.198.31 |
| 50 | 10.21.198.32/27 | 10.21.198.33 – 10.21.198.62 | 10.21.198.63 |
| 51 | 10.21.198.64/27 | 10.21.198.65 – 10.21.198.94 | 10.21.198.95 |
| 52 | 10.21.198.96/27 | 10.21.198.97 – 10.21.198.126 | 10.21.198.127 |
| 53 | 10.21.198.128/27 | 10.21.198.129 – 10.21.198.158 | 10.21.198.159 |
| 54 | 10.21.198.160/27 | 10.21.198.161 – 10.21.198.190 | 10.21.198.191 |
| 55 | 10.21.198.192/27 | 10.21.198.193 – 10.21.198.222 | 10.21.198.223 |
| 56 | 10.21.198.224/27 | 10.21.198.225 – 10.21.198.254 | 10.21.198.255 |
| 57 | 10.21.199.0/27 | 10.21.199.1 – 10.21.199.30 | 10.21.199.31 |
| 58 | 10.21.199.32/27 | 10.21.199.33 – 10.21.199.62 | 10.21.199.63 |
| 59 | 10.21.199.64/27 | 10.21.199.65 – 10.21.199.94 | 10.21.199.95 |
| 60 | 10.21.199.96/27 | 10.21.199.97 – 10.21.199.126 | 10.21.199.127 |
| 61 | 10.21.199.128/27 | 10.21.199.129 – 10.21.199.158 | 10.21.199.159 |
| 62 | 10.21.199.160/27 | 10.21.199.161 – 10.21.199.190 | 10.21.199.191 |
| 63 | 10.21.199.192/27 | 10.21.199.193 – 10.21.199.222 | 10.21.199.223 |
| 64 | 10.21.199.224/27 | 10.21.199.225 – 10.21.199.254 | 10.21.199.255 |
| 65 | 10.21.200.0/27 | 10.21.200.1 – 10.21.200.30 | 10.21.200.31 |
| 66 | 10.21.200.32/27 | 10.21.200.33 – 10.21.200.62 | 10.21.200.63 |
| 67 | 10.21.200.64/27 | 10.21.200.65 – 10.21.200.94 | 10.21.200.95 |
| 68 | 10.21.200.96/27 | 10.21.200.97 – 10.21.200.126 | 10.21.200.127 |
| 69 | 10.21.200.128/27 | 10.21.200.129 – 10.21.200.158 | 10.21.200.159 |
| 70 | 10.21.200.160/27 | 10.21.200.161 – 10.21.200.190 | 10.21.200.191 |
| 71 | 10.21.200.192/27 | 10.21.200.193 – 10.21.200.222 | 10.21.200.223 |
| 72 | 10.21.200.224/27 | 10.21.200.225 – 10.21.200.254 | 10.21.200.255 |
| 73 | 10.21.201.0/27 | 10.21.201.1 – 10.21.201.30 | 10.21.201.31 |
| 74 | 10.21.201.32/27 | 10.21.201.33 – 10.21.201.62 | 10.21.201.63 |
| 75 | 10.21.201.64/27 | 10.21.201.65 – 10.21.201.94 | 10.21.201.95 |
| 76 | 10.21.201.96/27 | 10.21.201.97 – 10.21.201.126 | 10.21.201.127 |
| 77 | 10.21.201.128/27 | 10.21.201.129 – 10.21.201.158 | 10.21.201.159 |
| 78 | 10.21.201.160/27 | 10.21.201.161 – 10.21.201.190 | 10.21.201.191 |
| 79 | 10.21.201.192/27 | 10.21.201.193 – 10.21.201.222 | 10.21.201.223 |
| 80 | 10.21.201.224/27 | 10.21.201.225 – 10.21.201.254 | 10.21.201.255 |
| 81 | 10.21.202.0/27 | 10.21.202.1 – 10.21.202.30 | 10.21.202.31 |
| 82 | 10.21.202.32/27 | 10.21.202.33 – 10.21.202.62 | 10.21.202.63 |
| 83 | 10.21.202.64/27 | 10.21.202.65 – 10.21.202.94 | 10.21.202.95 |
| 84 | 10.21.202.96/27 | 10.21.202.97 – 10.21.202.126 | 10.21.202.127 |
| 85 | 10.21.202.128/27 | 10.21.202.129 – 10.21.202.158 | 10.21.202.159 |
| 86 | 10.21.202.160/27 | 10.21.202.161 – 10.21.202.190 | 10.21.202.191 |
| 87 | 10.21.202.192/27 | 10.21.202.193 – 10.21.202.222 | 10.21.202.223 |
| 88 | 10.21.202.224/27 | 10.21.202.225 – 10.21.202.254 | 10.21.202.255 |
| 89 | 10.21.203.0/27 | 10.21.203.1 – 10.21.203.30 | 10.21.203.31 |
| 90 | 10.21.203.32/27 | 10.21.203.33 – 10.21.203.62 | 10.21.203.63 |
| 91 | 10.21.203.64/27 | 10.21.203.65 – 10.21.203.94 | 10.21.203.95 |
| 92 | 10.21.203.96/27 | 10.21.203.97 – 10.21.203.126 | 10.21.203.127 |
| 93 | 10.21.203.128/27 | 10.21.203.129 – 10.21.203.158 | 10.21.203.159 |
| 94 | 10.21.203.160/27 | 10.21.203.161 – 10.21.203.190 | 10.21.203.191 |
| 95 | 10.21.203.192/27 | 10.21.203.193 – 10.21.203.222 | 10.21.203.223 |
| 96 | 10.21.203.224/27 | 10.21.203.225 – 10.21.203.254 | 10.21.203.255 |
| 97 | 10.21.204.0/27 | 10.21.204.1 – 10.21.204.30 | 10.21.204.31 |
| 98 | 10.21.204.32/27 | 10.21.204.33 – 10.21.204.62 | 10.21.204.63 |
| 99 | 10.21.204.64/27 | 10.21.204.65 – 10.21.204.94 | 10.21.204.95 |
| 100 | 10.21.204.96/27 | 10.21.204.97 – 10.21.204.126 | 10.21.204.127 |
| 101 | 10.21.204.128/27 | 10.21.204.129 – 10.21.204.158 | 10.21.204.159 |
| 102 | 10.21.204.160/27 | 10.21.204.161 – 10.21.204.190 | 10.21.204.191 |
| 103 | 10.21.204.192/27 | 10.21.204.193 – 10.21.204.222 | 10.21.204.223 |
| 104 | 10.21.204.224/27 | 10.21.204.225 – 10.21.204.254 | 10.21.204.255 |
| 105 | 10.21.205.0/27 | 10.21.205.1 – 10.21.205.30 | 10.21.205.31 |
| 106 | 10.21.205.32/27 | 10.21.205.33 – 10.21.205.62 | 10.21.205.63 |
| 107 | 10.21.205.64/27 | 10.21.205.65 – 10.21.205.94 | 10.21.205.95 |
| 108 | 10.21.205.96/27 | 10.21.205.97 – 10.21.205.126 | 10.21.205.127 |
| 109 | 10.21.205.128/27 | 10.21.205.129 – 10.21.205.158 | 10.21.205.159 |
| 110 | 10.21.205.160/27 | 10.21.205.161 – 10.21.205.190 | 10.21.205.191 |
| 111 | 10.21.205.192/27 | 10.21.205.193 – 10.21.205.222 | 10.21.205.223 |
| 112 | 10.21.205.224/27 | 10.21.205.225 – 10.21.205.254 | 10.21.205.255 |
| 113 | 10.21.206.0/27 | 10.21.206.1 – 10.21.206.30 | 10.21.206.31 |
| 114 | 10.21.206.32/27 | 10.21.206.33 – 10.21.206.62 | 10.21.206.63 |
| 115 | 10.21.206.64/27 | 10.21.206.65 – 10.21.206.94 | 10.21.206.95 |
| 116 | 10.21.206.96/27 | 10.21.206.97 – 10.21.206.126 | 10.21.206.127 |
| 117 | 10.21.206.128/27 | 10.21.206.129 – 10.21.206.158 | 10.21.206.159 |
| 118 | 10.21.206.160/27 | 10.21.206.161 – 10.21.206.190 | 10.21.206.191 |
| 119 | 10.21.206.192/27 | 10.21.206.193 – 10.21.206.222 | 10.21.206.223 |
| 120 | 10.21.206.224/27 | 10.21.206.225 – 10.21.206.254 | 10.21.206.255 |
| 121 | 10.21.207.0/27 | 10.21.207.1 – 10.21.207.30 | 10.21.207.31 |
| 122 | 10.21.207.32/27 | 10.21.207.33 – 10.21.207.62 | 10.21.207.63 |
| 123 | 10.21.207.64/27 | 10.21.207.65 – 10.21.207.94 | 10.21.207.95 |
| 124 | 10.21.207.96/27 | 10.21.207.97 – 10.21.207.126 | 10.21.207.127 |
| 125 | 10.21.207.128/27 | 10.21.207.129 – 10.21.207.158 | 10.21.207.159 |
| 126 | 10.21.207.160/27 | 10.21.207.161 – 10.21.207.190 | 10.21.207.191 |
| 127 | 10.21.207.192/27 | 10.21.207.193 – 10.21.207.222 | 10.21.207.223 |
| 128 | 10.21.207.224/27 | 10.21.207.225 – 10.21.207.254 | 10.21.207.255 |
| 129 | 10.21.208.0/27 | 10.21.208.1 – 10.21.208.30 | 10.21.208.31 |
| 130 | 10.21.208.32/27 | 10.21.208.33 – 10.21.208.62 | 10.21.208.63 |
| 131 | 10.21.208.64/27 | 10.21.208.65 – 10.21.208.94 | 10.21.208.95 |
| 132 | 10.21.208.96/27 | 10.21.208.97 – 10.21.208.126 | 10.21.208.127 |
| 133 | 10.21.208.128/27 | 10.21.208.129 – 10.21.208.158 | 10.21.208.159 |
| 134 | 10.21.208.160/27 | 10.21.208.161 – 10.21.208.190 | 10.21.208.191 |
| 135 | 10.21.208.192/27 | 10.21.208.193 – 10.21.208.222 | 10.21.208.223 |
| 136 | 10.21.208.224/27 | 10.21.208.225 – 10.21.208.254 | 10.21.208.255 |
| 137 | 10.21.209.0/27 | 10.21.209.1 – 10.21.209.30 | 10.21.209.31 |
| 138 | 10.21.209.32/27 | 10.21.209.33 – 10.21.209.62 | 10.21.209.63 |
| 139 | 10.21.209.64/27 | 10.21.209.65 – 10.21.209.94 | 10.21.209.95 |
| 140 | 10.21.209.96/27 | 10.21.209.97 – 10.21.209.126 | 10.21.209.127 |
| 141 | 10.21.209.128/27 | 10.21.209.129 – 10.21.209.158 | 10.21.209.159 |
| 142 | 10.21.209.160/27 | 10.21.209.161 – 10.21.209.190 | 10.21.209.191 |
| 143 | 10.21.209.192/27 | 10.21.209.193 – 10.21.209.222 | 10.21.209.223 |
| 144 | 10.21.209.224/27 | 10.21.209.225 – 10.21.209.254 | 10.21.209.255 |
| 145 | 10.21.210.0/27 | 10.21.210.1 – 10.21.210.30 | 10.21.210.31 |
| 146 | 10.21.210.32/27 | 10.21.210.33 – 10.21.210.62 | 10.21.210.63 |
| 147 | 10.21.210.64/27 | 10.21.210.65 – 10.21.210.94 | 10.21.210.95 |
| 148 | 10.21.210.96/27 | 10.21.210.97 – 10.21.210.126 | 10.21.210.127 |
| 149 | 10.21.210.128/27 | 10.21.210.129 – 10.21.210.158 | 10.21.210.159 |
| 150 | 10.21.210.160/27 | 10.21.210.161 – 10.21.210.190 | 10.21.210.191 |
| 151 | 10.21.210.192/27 | 10.21.210.193 – 10.21.210.222 | 10.21.210.223 |
| 152 | 10.21.210.224/27 | 10.21.210.225 – 10.21.210.254 | 10.21.210.255 |
| 153 | 10.21.211.0/27 | 10.21.211.1 – 10.21.211.30 | 10.21.211.31 |
| 154 | 10.21.211.32/27 | 10.21.211.33 – 10.21.211.62 | 10.21.211.63 |
| 155 | 10.21.211.64/27 | 10.21.211.65 – 10.21.211.94 | 10.21.211.95 |
| 156 | 10.21.211.96/27 | 10.21.211.97 – 10.21.211.126 | 10.21.211.127 |
| 157 | 10.21.211.128/27 | 10.21.211.129 – 10.21.211.158 | 10.21.211.159 |
| 158 | 10.21.211.160/27 | 10.21.211.161 – 10.21.211.190 | 10.21.211.191 |
| 159 | 10.21.211.192/27 | 10.21.211.193 – 10.21.211.222 | 10.21.211.223 |
| 160 | 10.21.211.224/27 | 10.21.211.225 – 10.21.211.254 | 10.21.211.255 |
| 161 | 10.21.212.0/27 | 10.21.212.1 – 10.21.212.30 | 10.21.212.31 |
| 162 | 10.21.212.32/27 | 10.21.212.33 – 10.21.212.62 | 10.21.212.63 |
| 163 | 10.21.212.64/27 | 10.21.212.65 – 10.21.212.94 | 10.21.212.95 |
| 164 | 10.21.212.96/27 | 10.21.212.97 – 10.21.212.126 | 10.21.212.127 |
| 165 | 10.21.212.128/27 | 10.21.212.129 – 10.21.212.158 | 10.21.212.159 |
| 166 | 10.21.212.160/27 | 10.21.212.161 – 10.21.212.190 | 10.21.212.191 |
| 167 | 10.21.212.192/27 | 10.21.212.193 – 10.21.212.222 | 10.21.212.223 |
| 168 | 10.21.212.224/27 | 10.21.212.225 – 10.21.212.254 | 10.21.212.255 |
| 169 | 10.21.213.0/27 | 10.21.213.1 – 10.21.213.30 | 10.21.213.31 |
| 170 | 10.21.213.32/27 | 10.21.213.33 – 10.21.213.62 | 10.21.213.63 |
| 171 | 10.21.213.64/27 | 10.21.213.65 – 10.21.213.94 | 10.21.213.95 |
| 172 | 10.21.213.96/27 | 10.21.213.97 – 10.21.213.126 | 10.21.213.127 |
| 173 | 10.21.213.128/27 | 10.21.213.129 – 10.21.213.158 | 10.21.213.159 |
| 174 | 10.21.213.160/27 | 10.21.213.161 – 10.21.213.190 | 10.21.213.191 |
| 175 | 10.21.213.192/27 | 10.21.213.193 – 10.21.213.222 | 10.21.213.223 |
| 176 | 10.21.213.224/27 | 10.21.213.225 – 10.21.213.254 | 10.21.213.255 |
| 177 | 10.21.214.0/27 | 10.21.214.1 – 10.21.214.30 | 10.21.214.31 |
| 178 | 10.21.214.32/27 | 10.21.214.33 – 10.21.214.62 | 10.21.214.63 |
| 179 | 10.21.214.64/27 | 10.21.214.65 – 10.21.214.94 | 10.21.214.95 |
| 180 | 10.21.214.96/27 | 10.21.214.97 – 10.21.214.126 | 10.21.214.127 |
| 181 | 10.21.214.128/27 | 10.21.214.129 – 10.21.214.158 | 10.21.214.159 |
| 182 | 10.21.214.160/27 | 10.21.214.161 – 10.21.214.190 | 10.21.214.191 |
| 183 | 10.21.214.192/27 | 10.21.214.193 – 10.21.214.222 | 10.21.214.223 |
| 184 | 10.21.214.224/27 | 10.21.214.225 – 10.21.214.254 | 10.21.214.255 |
| 185 | 10.21.215.0/27 | 10.21.215.1 – 10.21.215.30 | 10.21.215.31 |
| 186 | 10.21.215.32/27 | 10.21.215.33 – 10.21.215.62 | 10.21.215.63 |
| 187 | 10.21.215.64/27 | 10.21.215.65 – 10.21.215.94 | 10.21.215.95 |
| 188 | 10.21.215.96/27 | 10.21.215.97 – 10.21.215.126 | 10.21.215.127 |
| 189 | 10.21.215.128/27 | 10.21.215.129 – 10.21.215.158 | 10.21.215.159 |
| 190 | 10.21.215.160/27 | 10.21.215.161 – 10.21.215.190 | 10.21.215.191 |
| 191 | 10.21.215.192/27 | 10.21.215.193 – 10.21.215.222 | 10.21.215.223 |
| 192 | 10.21.215.224/27 | 10.21.215.225 – 10.21.215.254 | 10.21.215.255 |
| 193 | 10.21.216.0/27 | 10.21.216.1 – 10.21.216.30 | 10.21.216.31 |
| 194 | 10.21.216.32/27 | 10.21.216.33 – 10.21.216.62 | 10.21.216.63 |
| 195 | 10.21.216.64/27 | 10.21.216.65 – 10.21.216.94 | 10.21.216.95 |
| 196 | 10.21.216.96/27 | 10.21.216.97 – 10.21.216.126 | 10.21.216.127 |
| 197 | 10.21.216.128/27 | 10.21.216.129 – 10.21.216.158 | 10.21.216.159 |
| 198 | 10.21.216.160/27 | 10.21.216.161 – 10.21.216.190 | 10.21.216.191 |
| 199 | 10.21.216.192/27 | 10.21.216.193 – 10.21.216.222 | 10.21.216.223 |
| 200 | 10.21.216.224/27 | 10.21.216.225 – 10.21.216.254 | 10.21.216.255 |
| 201 | 10.21.217.0/27 | 10.21.217.1 – 10.21.217.30 | 10.21.217.31 |
| 202 | 10.21.217.32/27 | 10.21.217.33 – 10.21.217.62 | 10.21.217.63 |
| 203 | 10.21.217.64/27 | 10.21.217.65 – 10.21.217.94 | 10.21.217.95 |
| 204 | 10.21.217.96/27 | 10.21.217.97 – 10.21.217.126 | 10.21.217.127 |
| 205 | 10.21.217.128/27 | 10.21.217.129 – 10.21.217.158 | 10.21.217.159 |
| 206 | 10.21.217.160/27 | 10.21.217.161 – 10.21.217.190 | 10.21.217.191 |
| 207 | 10.21.217.192/27 | 10.21.217.193 – 10.21.217.222 | 10.21.217.223 |
| 208 | 10.21.217.224/27 | 10.21.217.225 – 10.21.217.254 | 10.21.217.255 |
| 209 | 10.21.218.0/27 | 10.21.218.1 – 10.21.218.30 | 10.21.218.31 |
| 210 | 10.21.218.32/27 | 10.21.218.33 – 10.21.218.62 | 10.21.218.63 |
| 211 | 10.21.218.64/27 | 10.21.218.65 – 10.21.218.94 | 10.21.218.95 |
| 212 | 10.21.218.96/27 | 10.21.218.97 – 10.21.218.126 | 10.21.218.127 |
| 213 | 10.21.218.128/27 | 10.21.218.129 – 10.21.218.158 | 10.21.218.159 |
| 214 | 10.21.218.160/27 | 10.21.218.161 – 10.21.218.190 | 10.21.218.191 |
| 215 | 10.21.218.192/27 | 10.21.218.193 – 10.21.218.222 | 10.21.218.223 |
| 216 | 10.21.218.224/27 | 10.21.218.225 – 10.21.218.254 | 10.21.218.255 |
| 217 | 10.21.219.0/27 | 10.21.219.1 – 10.21.219.30 | 10.21.219.31 |
| 218 | 10.21.219.32/27 | 10.21.219.33 – 10.21.219.62 | 10.21.219.63 |
| 219 | 10.21.219.64/27 | 10.21.219.65 – 10.21.219.94 | 10.21.219.95 |
| 220 | 10.21.219.96/27 | 10.21.219.97 – 10.21.219.126 | 10.21.219.127 |
| 221 | 10.21.219.128/27 | 10.21.219.129 – 10.21.219.158 | 10.21.219.159 |
| 222 | 10.21.219.160/27 | 10.21.219.161 – 10.21.219.190 | 10.21.219.191 |
| 223 | 10.21.219.192/27 | 10.21.219.193 – 10.21.219.222 | 10.21.219.223 |
| 224 | 10.21.219.224/27 | 10.21.219.225 – 10.21.219.254 | 10.21.219.255 |
| 225 | 10.21.220.0/27 | 10.21.220.1 – 10.21.220.30 | 10.21.220.31 |
| 226 | 10.21.220.32/27 | 10.21.220.33 – 10.21.220.62 | 10.21.220.63 |
| 227 | 10.21.220.64/27 | 10.21.220.65 – 10.21.220.94 | 10.21.220.95 |
| 228 | 10.21.220.96/27 | 10.21.220.97 – 10.21.220.126 | 10.21.220.127 |
| 229 | 10.21.220.128/27 | 10.21.220.129 – 10.21.220.158 | 10.21.220.159 |
| 230 | 10.21.220.160/27 | 10.21.220.161 – 10.21.220.190 | 10.21.220.191 |
| 231 | 10.21.220.192/27 | 10.21.220.193 – 10.21.220.222 | 10.21.220.223 |
| 232 | 10.21.220.224/27 | 10.21.220.225 – 10.21.220.254 | 10.21.220.255 |
| 233 | 10.21.221.0/27 | 10.21.221.1 – 10.21.221.30 | 10.21.221.31 |
| 234 | 10.21.221.32/27 | 10.21.221.33 – 10.21.221.62 | 10.21.221.63 |
| 235 | 10.21.221.64/27 | 10.21.221.65 – 10.21.221.94 | 10.21.221.95 |
| 236 | 10.21.221.96/27 | 10.21.221.97 – 10.21.221.126 | 10.21.221.127 |
| 237 | 10.21.221.128/27 | 10.21.221.129 – 10.21.221.158 | 10.21.221.159 |
| 238 | 10.21.221.160/27 | 10.21.221.161 – 10.21.221.190 | 10.21.221.191 |
| 239 | 10.21.221.192/27 | 10.21.221.193 – 10.21.221.222 | 10.21.221.223 |
| 240 | 10.21.221.224/27 | 10.21.221.225 – 10.21.221.254 | 10.21.221.255 |
| 241 | 10.21.222.0/27 | 10.21.222.1 – 10.21.222.30 | 10.21.222.31 |
| 242 | 10.21.222.32/27 | 10.21.222.33 – 10.21.222.62 | 10.21.222.63 |
| 243 | 10.21.222.64/27 | 10.21.222.65 – 10.21.222.94 | 10.21.222.95 |
| 244 | 10.21.222.96/27 | 10.21.222.97 – 10.21.222.126 | 10.21.222.127 |
| 245 | 10.21.222.128/27 | 10.21.222.129 – 10.21.222.158 | 10.21.222.159 |
| 246 | 10.21.222.160/27 | 10.21.222.161 – 10.21.222.190 | 10.21.222.191 |
| 247 | 10.21.222.192/27 | 10.21.222.193 – 10.21.222.222 | 10.21.222.223 |
| 248 | 10.21.222.224/27 | 10.21.222.225 – 10.21.222.254 | 10.21.222.255 |
| 249 | 10.21.223.0/27 | 10.21.223.1 – 10.21.223.30 | 10.21.223.31 |
| 250 | 10.21.223.32/27 | 10.21.223.33 – 10.21.223.62 | 10.21.223.63 |
| 251 | 10.21.223.64/27 | 10.21.223.65 – 10.21.223.94 | 10.21.223.95 |
| 252 | 10.21.223.96/27 | 10.21.223.97 – 10.21.223.126 | 10.21.223.127 |
| 253 | 10.21.223.128/27 | 10.21.223.129 – 10.21.223.158 | 10.21.223.159 |
| 254 | 10.21.223.160/27 | 10.21.223.161 – 10.21.223.190 | 10.21.223.191 |
| 255 | 10.21.223.192/27 | 10.21.223.193 – 10.21.223.222 | 10.21.223.223 |
| 256 | 10.21.223.224/27 | 10.21.223.225 – 10.21.223.254 | 10.21.223.255 |
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 /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.