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 /26 · 256 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.192.0/26 | 10.21.192.1 – 10.21.192.62 | 10.21.192.63 |
| 2 | 10.21.192.64/26 | 10.21.192.65 – 10.21.192.126 | 10.21.192.127 |
| 3 | 10.21.192.128/26 | 10.21.192.129 – 10.21.192.190 | 10.21.192.191 |
| 4 | 10.21.192.192/26 | 10.21.192.193 – 10.21.192.254 | 10.21.192.255 |
| 5 | 10.21.193.0/26 | 10.21.193.1 – 10.21.193.62 | 10.21.193.63 |
| 6 | 10.21.193.64/26 | 10.21.193.65 – 10.21.193.126 | 10.21.193.127 |
| 7 | 10.21.193.128/26 | 10.21.193.129 – 10.21.193.190 | 10.21.193.191 |
| 8 | 10.21.193.192/26 | 10.21.193.193 – 10.21.193.254 | 10.21.193.255 |
| 9 | 10.21.194.0/26 | 10.21.194.1 – 10.21.194.62 | 10.21.194.63 |
| 10 | 10.21.194.64/26 | 10.21.194.65 – 10.21.194.126 | 10.21.194.127 |
| 11 | 10.21.194.128/26 | 10.21.194.129 – 10.21.194.190 | 10.21.194.191 |
| 12 | 10.21.194.192/26 | 10.21.194.193 – 10.21.194.254 | 10.21.194.255 |
| 13 | 10.21.195.0/26 | 10.21.195.1 – 10.21.195.62 | 10.21.195.63 |
| 14 | 10.21.195.64/26 | 10.21.195.65 – 10.21.195.126 | 10.21.195.127 |
| 15 | 10.21.195.128/26 | 10.21.195.129 – 10.21.195.190 | 10.21.195.191 |
| 16 | 10.21.195.192/26 | 10.21.195.193 – 10.21.195.254 | 10.21.195.255 |
| 17 | 10.21.196.0/26 | 10.21.196.1 – 10.21.196.62 | 10.21.196.63 |
| 18 | 10.21.196.64/26 | 10.21.196.65 – 10.21.196.126 | 10.21.196.127 |
| 19 | 10.21.196.128/26 | 10.21.196.129 – 10.21.196.190 | 10.21.196.191 |
| 20 | 10.21.196.192/26 | 10.21.196.193 – 10.21.196.254 | 10.21.196.255 |
| 21 | 10.21.197.0/26 | 10.21.197.1 – 10.21.197.62 | 10.21.197.63 |
| 22 | 10.21.197.64/26 | 10.21.197.65 – 10.21.197.126 | 10.21.197.127 |
| 23 | 10.21.197.128/26 | 10.21.197.129 – 10.21.197.190 | 10.21.197.191 |
| 24 | 10.21.197.192/26 | 10.21.197.193 – 10.21.197.254 | 10.21.197.255 |
| 25 | 10.21.198.0/26 | 10.21.198.1 – 10.21.198.62 | 10.21.198.63 |
| 26 | 10.21.198.64/26 | 10.21.198.65 – 10.21.198.126 | 10.21.198.127 |
| 27 | 10.21.198.128/26 | 10.21.198.129 – 10.21.198.190 | 10.21.198.191 |
| 28 | 10.21.198.192/26 | 10.21.198.193 – 10.21.198.254 | 10.21.198.255 |
| 29 | 10.21.199.0/26 | 10.21.199.1 – 10.21.199.62 | 10.21.199.63 |
| 30 | 10.21.199.64/26 | 10.21.199.65 – 10.21.199.126 | 10.21.199.127 |
| 31 | 10.21.199.128/26 | 10.21.199.129 – 10.21.199.190 | 10.21.199.191 |
| 32 | 10.21.199.192/26 | 10.21.199.193 – 10.21.199.254 | 10.21.199.255 |
| 33 | 10.21.200.0/26 | 10.21.200.1 – 10.21.200.62 | 10.21.200.63 |
| 34 | 10.21.200.64/26 | 10.21.200.65 – 10.21.200.126 | 10.21.200.127 |
| 35 | 10.21.200.128/26 | 10.21.200.129 – 10.21.200.190 | 10.21.200.191 |
| 36 | 10.21.200.192/26 | 10.21.200.193 – 10.21.200.254 | 10.21.200.255 |
| 37 | 10.21.201.0/26 | 10.21.201.1 – 10.21.201.62 | 10.21.201.63 |
| 38 | 10.21.201.64/26 | 10.21.201.65 – 10.21.201.126 | 10.21.201.127 |
| 39 | 10.21.201.128/26 | 10.21.201.129 – 10.21.201.190 | 10.21.201.191 |
| 40 | 10.21.201.192/26 | 10.21.201.193 – 10.21.201.254 | 10.21.201.255 |
| 41 | 10.21.202.0/26 | 10.21.202.1 – 10.21.202.62 | 10.21.202.63 |
| 42 | 10.21.202.64/26 | 10.21.202.65 – 10.21.202.126 | 10.21.202.127 |
| 43 | 10.21.202.128/26 | 10.21.202.129 – 10.21.202.190 | 10.21.202.191 |
| 44 | 10.21.202.192/26 | 10.21.202.193 – 10.21.202.254 | 10.21.202.255 |
| 45 | 10.21.203.0/26 | 10.21.203.1 – 10.21.203.62 | 10.21.203.63 |
| 46 | 10.21.203.64/26 | 10.21.203.65 – 10.21.203.126 | 10.21.203.127 |
| 47 | 10.21.203.128/26 | 10.21.203.129 – 10.21.203.190 | 10.21.203.191 |
| 48 | 10.21.203.192/26 | 10.21.203.193 – 10.21.203.254 | 10.21.203.255 |
| 49 | 10.21.204.0/26 | 10.21.204.1 – 10.21.204.62 | 10.21.204.63 |
| 50 | 10.21.204.64/26 | 10.21.204.65 – 10.21.204.126 | 10.21.204.127 |
| 51 | 10.21.204.128/26 | 10.21.204.129 – 10.21.204.190 | 10.21.204.191 |
| 52 | 10.21.204.192/26 | 10.21.204.193 – 10.21.204.254 | 10.21.204.255 |
| 53 | 10.21.205.0/26 | 10.21.205.1 – 10.21.205.62 | 10.21.205.63 |
| 54 | 10.21.205.64/26 | 10.21.205.65 – 10.21.205.126 | 10.21.205.127 |
| 55 | 10.21.205.128/26 | 10.21.205.129 – 10.21.205.190 | 10.21.205.191 |
| 56 | 10.21.205.192/26 | 10.21.205.193 – 10.21.205.254 | 10.21.205.255 |
| 57 | 10.21.206.0/26 | 10.21.206.1 – 10.21.206.62 | 10.21.206.63 |
| 58 | 10.21.206.64/26 | 10.21.206.65 – 10.21.206.126 | 10.21.206.127 |
| 59 | 10.21.206.128/26 | 10.21.206.129 – 10.21.206.190 | 10.21.206.191 |
| 60 | 10.21.206.192/26 | 10.21.206.193 – 10.21.206.254 | 10.21.206.255 |
| 61 | 10.21.207.0/26 | 10.21.207.1 – 10.21.207.62 | 10.21.207.63 |
| 62 | 10.21.207.64/26 | 10.21.207.65 – 10.21.207.126 | 10.21.207.127 |
| 63 | 10.21.207.128/26 | 10.21.207.129 – 10.21.207.190 | 10.21.207.191 |
| 64 | 10.21.207.192/26 | 10.21.207.193 – 10.21.207.254 | 10.21.207.255 |
| 65 | 10.21.208.0/26 | 10.21.208.1 – 10.21.208.62 | 10.21.208.63 |
| 66 | 10.21.208.64/26 | 10.21.208.65 – 10.21.208.126 | 10.21.208.127 |
| 67 | 10.21.208.128/26 | 10.21.208.129 – 10.21.208.190 | 10.21.208.191 |
| 68 | 10.21.208.192/26 | 10.21.208.193 – 10.21.208.254 | 10.21.208.255 |
| 69 | 10.21.209.0/26 | 10.21.209.1 – 10.21.209.62 | 10.21.209.63 |
| 70 | 10.21.209.64/26 | 10.21.209.65 – 10.21.209.126 | 10.21.209.127 |
| 71 | 10.21.209.128/26 | 10.21.209.129 – 10.21.209.190 | 10.21.209.191 |
| 72 | 10.21.209.192/26 | 10.21.209.193 – 10.21.209.254 | 10.21.209.255 |
| 73 | 10.21.210.0/26 | 10.21.210.1 – 10.21.210.62 | 10.21.210.63 |
| 74 | 10.21.210.64/26 | 10.21.210.65 – 10.21.210.126 | 10.21.210.127 |
| 75 | 10.21.210.128/26 | 10.21.210.129 – 10.21.210.190 | 10.21.210.191 |
| 76 | 10.21.210.192/26 | 10.21.210.193 – 10.21.210.254 | 10.21.210.255 |
| 77 | 10.21.211.0/26 | 10.21.211.1 – 10.21.211.62 | 10.21.211.63 |
| 78 | 10.21.211.64/26 | 10.21.211.65 – 10.21.211.126 | 10.21.211.127 |
| 79 | 10.21.211.128/26 | 10.21.211.129 – 10.21.211.190 | 10.21.211.191 |
| 80 | 10.21.211.192/26 | 10.21.211.193 – 10.21.211.254 | 10.21.211.255 |
| 81 | 10.21.212.0/26 | 10.21.212.1 – 10.21.212.62 | 10.21.212.63 |
| 82 | 10.21.212.64/26 | 10.21.212.65 – 10.21.212.126 | 10.21.212.127 |
| 83 | 10.21.212.128/26 | 10.21.212.129 – 10.21.212.190 | 10.21.212.191 |
| 84 | 10.21.212.192/26 | 10.21.212.193 – 10.21.212.254 | 10.21.212.255 |
| 85 | 10.21.213.0/26 | 10.21.213.1 – 10.21.213.62 | 10.21.213.63 |
| 86 | 10.21.213.64/26 | 10.21.213.65 – 10.21.213.126 | 10.21.213.127 |
| 87 | 10.21.213.128/26 | 10.21.213.129 – 10.21.213.190 | 10.21.213.191 |
| 88 | 10.21.213.192/26 | 10.21.213.193 – 10.21.213.254 | 10.21.213.255 |
| 89 | 10.21.214.0/26 | 10.21.214.1 – 10.21.214.62 | 10.21.214.63 |
| 90 | 10.21.214.64/26 | 10.21.214.65 – 10.21.214.126 | 10.21.214.127 |
| 91 | 10.21.214.128/26 | 10.21.214.129 – 10.21.214.190 | 10.21.214.191 |
| 92 | 10.21.214.192/26 | 10.21.214.193 – 10.21.214.254 | 10.21.214.255 |
| 93 | 10.21.215.0/26 | 10.21.215.1 – 10.21.215.62 | 10.21.215.63 |
| 94 | 10.21.215.64/26 | 10.21.215.65 – 10.21.215.126 | 10.21.215.127 |
| 95 | 10.21.215.128/26 | 10.21.215.129 – 10.21.215.190 | 10.21.215.191 |
| 96 | 10.21.215.192/26 | 10.21.215.193 – 10.21.215.254 | 10.21.215.255 |
| 97 | 10.21.216.0/26 | 10.21.216.1 – 10.21.216.62 | 10.21.216.63 |
| 98 | 10.21.216.64/26 | 10.21.216.65 – 10.21.216.126 | 10.21.216.127 |
| 99 | 10.21.216.128/26 | 10.21.216.129 – 10.21.216.190 | 10.21.216.191 |
| 100 | 10.21.216.192/26 | 10.21.216.193 – 10.21.216.254 | 10.21.216.255 |
| 101 | 10.21.217.0/26 | 10.21.217.1 – 10.21.217.62 | 10.21.217.63 |
| 102 | 10.21.217.64/26 | 10.21.217.65 – 10.21.217.126 | 10.21.217.127 |
| 103 | 10.21.217.128/26 | 10.21.217.129 – 10.21.217.190 | 10.21.217.191 |
| 104 | 10.21.217.192/26 | 10.21.217.193 – 10.21.217.254 | 10.21.217.255 |
| 105 | 10.21.218.0/26 | 10.21.218.1 – 10.21.218.62 | 10.21.218.63 |
| 106 | 10.21.218.64/26 | 10.21.218.65 – 10.21.218.126 | 10.21.218.127 |
| 107 | 10.21.218.128/26 | 10.21.218.129 – 10.21.218.190 | 10.21.218.191 |
| 108 | 10.21.218.192/26 | 10.21.218.193 – 10.21.218.254 | 10.21.218.255 |
| 109 | 10.21.219.0/26 | 10.21.219.1 – 10.21.219.62 | 10.21.219.63 |
| 110 | 10.21.219.64/26 | 10.21.219.65 – 10.21.219.126 | 10.21.219.127 |
| 111 | 10.21.219.128/26 | 10.21.219.129 – 10.21.219.190 | 10.21.219.191 |
| 112 | 10.21.219.192/26 | 10.21.219.193 – 10.21.219.254 | 10.21.219.255 |
| 113 | 10.21.220.0/26 | 10.21.220.1 – 10.21.220.62 | 10.21.220.63 |
| 114 | 10.21.220.64/26 | 10.21.220.65 – 10.21.220.126 | 10.21.220.127 |
| 115 | 10.21.220.128/26 | 10.21.220.129 – 10.21.220.190 | 10.21.220.191 |
| 116 | 10.21.220.192/26 | 10.21.220.193 – 10.21.220.254 | 10.21.220.255 |
| 117 | 10.21.221.0/26 | 10.21.221.1 – 10.21.221.62 | 10.21.221.63 |
| 118 | 10.21.221.64/26 | 10.21.221.65 – 10.21.221.126 | 10.21.221.127 |
| 119 | 10.21.221.128/26 | 10.21.221.129 – 10.21.221.190 | 10.21.221.191 |
| 120 | 10.21.221.192/26 | 10.21.221.193 – 10.21.221.254 | 10.21.221.255 |
| 121 | 10.21.222.0/26 | 10.21.222.1 – 10.21.222.62 | 10.21.222.63 |
| 122 | 10.21.222.64/26 | 10.21.222.65 – 10.21.222.126 | 10.21.222.127 |
| 123 | 10.21.222.128/26 | 10.21.222.129 – 10.21.222.190 | 10.21.222.191 |
| 124 | 10.21.222.192/26 | 10.21.222.193 – 10.21.222.254 | 10.21.222.255 |
| 125 | 10.21.223.0/26 | 10.21.223.1 – 10.21.223.62 | 10.21.223.63 |
| 126 | 10.21.223.64/26 | 10.21.223.65 – 10.21.223.126 | 10.21.223.127 |
| 127 | 10.21.223.128/26 | 10.21.223.129 – 10.21.223.190 | 10.21.223.191 |
| 128 | 10.21.223.192/26 | 10.21.223.193 – 10.21.223.254 | 10.21.223.255 |
| 129 | 10.21.224.0/26 | 10.21.224.1 – 10.21.224.62 | 10.21.224.63 |
| 130 | 10.21.224.64/26 | 10.21.224.65 – 10.21.224.126 | 10.21.224.127 |
| 131 | 10.21.224.128/26 | 10.21.224.129 – 10.21.224.190 | 10.21.224.191 |
| 132 | 10.21.224.192/26 | 10.21.224.193 – 10.21.224.254 | 10.21.224.255 |
| 133 | 10.21.225.0/26 | 10.21.225.1 – 10.21.225.62 | 10.21.225.63 |
| 134 | 10.21.225.64/26 | 10.21.225.65 – 10.21.225.126 | 10.21.225.127 |
| 135 | 10.21.225.128/26 | 10.21.225.129 – 10.21.225.190 | 10.21.225.191 |
| 136 | 10.21.225.192/26 | 10.21.225.193 – 10.21.225.254 | 10.21.225.255 |
| 137 | 10.21.226.0/26 | 10.21.226.1 – 10.21.226.62 | 10.21.226.63 |
| 138 | 10.21.226.64/26 | 10.21.226.65 – 10.21.226.126 | 10.21.226.127 |
| 139 | 10.21.226.128/26 | 10.21.226.129 – 10.21.226.190 | 10.21.226.191 |
| 140 | 10.21.226.192/26 | 10.21.226.193 – 10.21.226.254 | 10.21.226.255 |
| 141 | 10.21.227.0/26 | 10.21.227.1 – 10.21.227.62 | 10.21.227.63 |
| 142 | 10.21.227.64/26 | 10.21.227.65 – 10.21.227.126 | 10.21.227.127 |
| 143 | 10.21.227.128/26 | 10.21.227.129 – 10.21.227.190 | 10.21.227.191 |
| 144 | 10.21.227.192/26 | 10.21.227.193 – 10.21.227.254 | 10.21.227.255 |
| 145 | 10.21.228.0/26 | 10.21.228.1 – 10.21.228.62 | 10.21.228.63 |
| 146 | 10.21.228.64/26 | 10.21.228.65 – 10.21.228.126 | 10.21.228.127 |
| 147 | 10.21.228.128/26 | 10.21.228.129 – 10.21.228.190 | 10.21.228.191 |
| 148 | 10.21.228.192/26 | 10.21.228.193 – 10.21.228.254 | 10.21.228.255 |
| 149 | 10.21.229.0/26 | 10.21.229.1 – 10.21.229.62 | 10.21.229.63 |
| 150 | 10.21.229.64/26 | 10.21.229.65 – 10.21.229.126 | 10.21.229.127 |
| 151 | 10.21.229.128/26 | 10.21.229.129 – 10.21.229.190 | 10.21.229.191 |
| 152 | 10.21.229.192/26 | 10.21.229.193 – 10.21.229.254 | 10.21.229.255 |
| 153 | 10.21.230.0/26 | 10.21.230.1 – 10.21.230.62 | 10.21.230.63 |
| 154 | 10.21.230.64/26 | 10.21.230.65 – 10.21.230.126 | 10.21.230.127 |
| 155 | 10.21.230.128/26 | 10.21.230.129 – 10.21.230.190 | 10.21.230.191 |
| 156 | 10.21.230.192/26 | 10.21.230.193 – 10.21.230.254 | 10.21.230.255 |
| 157 | 10.21.231.0/26 | 10.21.231.1 – 10.21.231.62 | 10.21.231.63 |
| 158 | 10.21.231.64/26 | 10.21.231.65 – 10.21.231.126 | 10.21.231.127 |
| 159 | 10.21.231.128/26 | 10.21.231.129 – 10.21.231.190 | 10.21.231.191 |
| 160 | 10.21.231.192/26 | 10.21.231.193 – 10.21.231.254 | 10.21.231.255 |
| 161 | 10.21.232.0/26 | 10.21.232.1 – 10.21.232.62 | 10.21.232.63 |
| 162 | 10.21.232.64/26 | 10.21.232.65 – 10.21.232.126 | 10.21.232.127 |
| 163 | 10.21.232.128/26 | 10.21.232.129 – 10.21.232.190 | 10.21.232.191 |
| 164 | 10.21.232.192/26 | 10.21.232.193 – 10.21.232.254 | 10.21.232.255 |
| 165 | 10.21.233.0/26 | 10.21.233.1 – 10.21.233.62 | 10.21.233.63 |
| 166 | 10.21.233.64/26 | 10.21.233.65 – 10.21.233.126 | 10.21.233.127 |
| 167 | 10.21.233.128/26 | 10.21.233.129 – 10.21.233.190 | 10.21.233.191 |
| 168 | 10.21.233.192/26 | 10.21.233.193 – 10.21.233.254 | 10.21.233.255 |
| 169 | 10.21.234.0/26 | 10.21.234.1 – 10.21.234.62 | 10.21.234.63 |
| 170 | 10.21.234.64/26 | 10.21.234.65 – 10.21.234.126 | 10.21.234.127 |
| 171 | 10.21.234.128/26 | 10.21.234.129 – 10.21.234.190 | 10.21.234.191 |
| 172 | 10.21.234.192/26 | 10.21.234.193 – 10.21.234.254 | 10.21.234.255 |
| 173 | 10.21.235.0/26 | 10.21.235.1 – 10.21.235.62 | 10.21.235.63 |
| 174 | 10.21.235.64/26 | 10.21.235.65 – 10.21.235.126 | 10.21.235.127 |
| 175 | 10.21.235.128/26 | 10.21.235.129 – 10.21.235.190 | 10.21.235.191 |
| 176 | 10.21.235.192/26 | 10.21.235.193 – 10.21.235.254 | 10.21.235.255 |
| 177 | 10.21.236.0/26 | 10.21.236.1 – 10.21.236.62 | 10.21.236.63 |
| 178 | 10.21.236.64/26 | 10.21.236.65 – 10.21.236.126 | 10.21.236.127 |
| 179 | 10.21.236.128/26 | 10.21.236.129 – 10.21.236.190 | 10.21.236.191 |
| 180 | 10.21.236.192/26 | 10.21.236.193 – 10.21.236.254 | 10.21.236.255 |
| 181 | 10.21.237.0/26 | 10.21.237.1 – 10.21.237.62 | 10.21.237.63 |
| 182 | 10.21.237.64/26 | 10.21.237.65 – 10.21.237.126 | 10.21.237.127 |
| 183 | 10.21.237.128/26 | 10.21.237.129 – 10.21.237.190 | 10.21.237.191 |
| 184 | 10.21.237.192/26 | 10.21.237.193 – 10.21.237.254 | 10.21.237.255 |
| 185 | 10.21.238.0/26 | 10.21.238.1 – 10.21.238.62 | 10.21.238.63 |
| 186 | 10.21.238.64/26 | 10.21.238.65 – 10.21.238.126 | 10.21.238.127 |
| 187 | 10.21.238.128/26 | 10.21.238.129 – 10.21.238.190 | 10.21.238.191 |
| 188 | 10.21.238.192/26 | 10.21.238.193 – 10.21.238.254 | 10.21.238.255 |
| 189 | 10.21.239.0/26 | 10.21.239.1 – 10.21.239.62 | 10.21.239.63 |
| 190 | 10.21.239.64/26 | 10.21.239.65 – 10.21.239.126 | 10.21.239.127 |
| 191 | 10.21.239.128/26 | 10.21.239.129 – 10.21.239.190 | 10.21.239.191 |
| 192 | 10.21.239.192/26 | 10.21.239.193 – 10.21.239.254 | 10.21.239.255 |
| 193 | 10.21.240.0/26 | 10.21.240.1 – 10.21.240.62 | 10.21.240.63 |
| 194 | 10.21.240.64/26 | 10.21.240.65 – 10.21.240.126 | 10.21.240.127 |
| 195 | 10.21.240.128/26 | 10.21.240.129 – 10.21.240.190 | 10.21.240.191 |
| 196 | 10.21.240.192/26 | 10.21.240.193 – 10.21.240.254 | 10.21.240.255 |
| 197 | 10.21.241.0/26 | 10.21.241.1 – 10.21.241.62 | 10.21.241.63 |
| 198 | 10.21.241.64/26 | 10.21.241.65 – 10.21.241.126 | 10.21.241.127 |
| 199 | 10.21.241.128/26 | 10.21.241.129 – 10.21.241.190 | 10.21.241.191 |
| 200 | 10.21.241.192/26 | 10.21.241.193 – 10.21.241.254 | 10.21.241.255 |
| 201 | 10.21.242.0/26 | 10.21.242.1 – 10.21.242.62 | 10.21.242.63 |
| 202 | 10.21.242.64/26 | 10.21.242.65 – 10.21.242.126 | 10.21.242.127 |
| 203 | 10.21.242.128/26 | 10.21.242.129 – 10.21.242.190 | 10.21.242.191 |
| 204 | 10.21.242.192/26 | 10.21.242.193 – 10.21.242.254 | 10.21.242.255 |
| 205 | 10.21.243.0/26 | 10.21.243.1 – 10.21.243.62 | 10.21.243.63 |
| 206 | 10.21.243.64/26 | 10.21.243.65 – 10.21.243.126 | 10.21.243.127 |
| 207 | 10.21.243.128/26 | 10.21.243.129 – 10.21.243.190 | 10.21.243.191 |
| 208 | 10.21.243.192/26 | 10.21.243.193 – 10.21.243.254 | 10.21.243.255 |
| 209 | 10.21.244.0/26 | 10.21.244.1 – 10.21.244.62 | 10.21.244.63 |
| 210 | 10.21.244.64/26 | 10.21.244.65 – 10.21.244.126 | 10.21.244.127 |
| 211 | 10.21.244.128/26 | 10.21.244.129 – 10.21.244.190 | 10.21.244.191 |
| 212 | 10.21.244.192/26 | 10.21.244.193 – 10.21.244.254 | 10.21.244.255 |
| 213 | 10.21.245.0/26 | 10.21.245.1 – 10.21.245.62 | 10.21.245.63 |
| 214 | 10.21.245.64/26 | 10.21.245.65 – 10.21.245.126 | 10.21.245.127 |
| 215 | 10.21.245.128/26 | 10.21.245.129 – 10.21.245.190 | 10.21.245.191 |
| 216 | 10.21.245.192/26 | 10.21.245.193 – 10.21.245.254 | 10.21.245.255 |
| 217 | 10.21.246.0/26 | 10.21.246.1 – 10.21.246.62 | 10.21.246.63 |
| 218 | 10.21.246.64/26 | 10.21.246.65 – 10.21.246.126 | 10.21.246.127 |
| 219 | 10.21.246.128/26 | 10.21.246.129 – 10.21.246.190 | 10.21.246.191 |
| 220 | 10.21.246.192/26 | 10.21.246.193 – 10.21.246.254 | 10.21.246.255 |
| 221 | 10.21.247.0/26 | 10.21.247.1 – 10.21.247.62 | 10.21.247.63 |
| 222 | 10.21.247.64/26 | 10.21.247.65 – 10.21.247.126 | 10.21.247.127 |
| 223 | 10.21.247.128/26 | 10.21.247.129 – 10.21.247.190 | 10.21.247.191 |
| 224 | 10.21.247.192/26 | 10.21.247.193 – 10.21.247.254 | 10.21.247.255 |
| 225 | 10.21.248.0/26 | 10.21.248.1 – 10.21.248.62 | 10.21.248.63 |
| 226 | 10.21.248.64/26 | 10.21.248.65 – 10.21.248.126 | 10.21.248.127 |
| 227 | 10.21.248.128/26 | 10.21.248.129 – 10.21.248.190 | 10.21.248.191 |
| 228 | 10.21.248.192/26 | 10.21.248.193 – 10.21.248.254 | 10.21.248.255 |
| 229 | 10.21.249.0/26 | 10.21.249.1 – 10.21.249.62 | 10.21.249.63 |
| 230 | 10.21.249.64/26 | 10.21.249.65 – 10.21.249.126 | 10.21.249.127 |
| 231 | 10.21.249.128/26 | 10.21.249.129 – 10.21.249.190 | 10.21.249.191 |
| 232 | 10.21.249.192/26 | 10.21.249.193 – 10.21.249.254 | 10.21.249.255 |
| 233 | 10.21.250.0/26 | 10.21.250.1 – 10.21.250.62 | 10.21.250.63 |
| 234 | 10.21.250.64/26 | 10.21.250.65 – 10.21.250.126 | 10.21.250.127 |
| 235 | 10.21.250.128/26 | 10.21.250.129 – 10.21.250.190 | 10.21.250.191 |
| 236 | 10.21.250.192/26 | 10.21.250.193 – 10.21.250.254 | 10.21.250.255 |
| 237 | 10.21.251.0/26 | 10.21.251.1 – 10.21.251.62 | 10.21.251.63 |
| 238 | 10.21.251.64/26 | 10.21.251.65 – 10.21.251.126 | 10.21.251.127 |
| 239 | 10.21.251.128/26 | 10.21.251.129 – 10.21.251.190 | 10.21.251.191 |
| 240 | 10.21.251.192/26 | 10.21.251.193 – 10.21.251.254 | 10.21.251.255 |
| 241 | 10.21.252.0/26 | 10.21.252.1 – 10.21.252.62 | 10.21.252.63 |
| 242 | 10.21.252.64/26 | 10.21.252.65 – 10.21.252.126 | 10.21.252.127 |
| 243 | 10.21.252.128/26 | 10.21.252.129 – 10.21.252.190 | 10.21.252.191 |
| 244 | 10.21.252.192/26 | 10.21.252.193 – 10.21.252.254 | 10.21.252.255 |
| 245 | 10.21.253.0/26 | 10.21.253.1 – 10.21.253.62 | 10.21.253.63 |
| 246 | 10.21.253.64/26 | 10.21.253.65 – 10.21.253.126 | 10.21.253.127 |
| 247 | 10.21.253.128/26 | 10.21.253.129 – 10.21.253.190 | 10.21.253.191 |
| 248 | 10.21.253.192/26 | 10.21.253.193 – 10.21.253.254 | 10.21.253.255 |
| 249 | 10.21.254.0/26 | 10.21.254.1 – 10.21.254.62 | 10.21.254.63 |
| 250 | 10.21.254.64/26 | 10.21.254.65 – 10.21.254.126 | 10.21.254.127 |
| 251 | 10.21.254.128/26 | 10.21.254.129 – 10.21.254.190 | 10.21.254.191 |
| 252 | 10.21.254.192/26 | 10.21.254.193 – 10.21.254.254 | 10.21.254.255 |
| 253 | 10.21.255.0/26 | 10.21.255.1 – 10.21.255.62 | 10.21.255.63 |
| 254 | 10.21.255.64/26 | 10.21.255.65 – 10.21.255.126 | 10.21.255.127 |
| 255 | 10.21.255.128/26 | 10.21.255.129 – 10.21.255.190 | 10.21.255.191 |
| 256 | 10.21.255.192/26 | 10.21.255.193 – 10.21.255.254 | 10.21.255.255 |
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.