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)10.21.0.0/17
network10.21.0.0/17
broadcast10.21.127.255
first host10.21.0.1
last host10.21.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.21.0.0/17
address00001010.00010101.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00010101.00000000.00000000
broadcast00001010.00010101.01111111.11111111
green = network part, grey = host part
hex0x0a150000
decimal169148416
reverse dns0.0.21.10.in-addr.arpa
ipv4-mapped::ffff:a15:0
/17 split into /26 · 512 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.21.0.0/26 | 10.21.0.1 – 10.21.0.62 | 10.21.0.63 |
| 2 | 10.21.0.64/26 | 10.21.0.65 – 10.21.0.126 | 10.21.0.127 |
| 3 | 10.21.0.128/26 | 10.21.0.129 – 10.21.0.190 | 10.21.0.191 |
| 4 | 10.21.0.192/26 | 10.21.0.193 – 10.21.0.254 | 10.21.0.255 |
| 5 | 10.21.1.0/26 | 10.21.1.1 – 10.21.1.62 | 10.21.1.63 |
| 6 | 10.21.1.64/26 | 10.21.1.65 – 10.21.1.126 | 10.21.1.127 |
| 7 | 10.21.1.128/26 | 10.21.1.129 – 10.21.1.190 | 10.21.1.191 |
| 8 | 10.21.1.192/26 | 10.21.1.193 – 10.21.1.254 | 10.21.1.255 |
| 9 | 10.21.2.0/26 | 10.21.2.1 – 10.21.2.62 | 10.21.2.63 |
| 10 | 10.21.2.64/26 | 10.21.2.65 – 10.21.2.126 | 10.21.2.127 |
| 11 | 10.21.2.128/26 | 10.21.2.129 – 10.21.2.190 | 10.21.2.191 |
| 12 | 10.21.2.192/26 | 10.21.2.193 – 10.21.2.254 | 10.21.2.255 |
| 13 | 10.21.3.0/26 | 10.21.3.1 – 10.21.3.62 | 10.21.3.63 |
| 14 | 10.21.3.64/26 | 10.21.3.65 – 10.21.3.126 | 10.21.3.127 |
| 15 | 10.21.3.128/26 | 10.21.3.129 – 10.21.3.190 | 10.21.3.191 |
| 16 | 10.21.3.192/26 | 10.21.3.193 – 10.21.3.254 | 10.21.3.255 |
| 17 | 10.21.4.0/26 | 10.21.4.1 – 10.21.4.62 | 10.21.4.63 |
| 18 | 10.21.4.64/26 | 10.21.4.65 – 10.21.4.126 | 10.21.4.127 |
| 19 | 10.21.4.128/26 | 10.21.4.129 – 10.21.4.190 | 10.21.4.191 |
| 20 | 10.21.4.192/26 | 10.21.4.193 – 10.21.4.254 | 10.21.4.255 |
| 21 | 10.21.5.0/26 | 10.21.5.1 – 10.21.5.62 | 10.21.5.63 |
| 22 | 10.21.5.64/26 | 10.21.5.65 – 10.21.5.126 | 10.21.5.127 |
| 23 | 10.21.5.128/26 | 10.21.5.129 – 10.21.5.190 | 10.21.5.191 |
| 24 | 10.21.5.192/26 | 10.21.5.193 – 10.21.5.254 | 10.21.5.255 |
| 25 | 10.21.6.0/26 | 10.21.6.1 – 10.21.6.62 | 10.21.6.63 |
| 26 | 10.21.6.64/26 | 10.21.6.65 – 10.21.6.126 | 10.21.6.127 |
| 27 | 10.21.6.128/26 | 10.21.6.129 – 10.21.6.190 | 10.21.6.191 |
| 28 | 10.21.6.192/26 | 10.21.6.193 – 10.21.6.254 | 10.21.6.255 |
| 29 | 10.21.7.0/26 | 10.21.7.1 – 10.21.7.62 | 10.21.7.63 |
| 30 | 10.21.7.64/26 | 10.21.7.65 – 10.21.7.126 | 10.21.7.127 |
| 31 | 10.21.7.128/26 | 10.21.7.129 – 10.21.7.190 | 10.21.7.191 |
| 32 | 10.21.7.192/26 | 10.21.7.193 – 10.21.7.254 | 10.21.7.255 |
| 33 | 10.21.8.0/26 | 10.21.8.1 – 10.21.8.62 | 10.21.8.63 |
| 34 | 10.21.8.64/26 | 10.21.8.65 – 10.21.8.126 | 10.21.8.127 |
| 35 | 10.21.8.128/26 | 10.21.8.129 – 10.21.8.190 | 10.21.8.191 |
| 36 | 10.21.8.192/26 | 10.21.8.193 – 10.21.8.254 | 10.21.8.255 |
| 37 | 10.21.9.0/26 | 10.21.9.1 – 10.21.9.62 | 10.21.9.63 |
| 38 | 10.21.9.64/26 | 10.21.9.65 – 10.21.9.126 | 10.21.9.127 |
| 39 | 10.21.9.128/26 | 10.21.9.129 – 10.21.9.190 | 10.21.9.191 |
| 40 | 10.21.9.192/26 | 10.21.9.193 – 10.21.9.254 | 10.21.9.255 |
| 41 | 10.21.10.0/26 | 10.21.10.1 – 10.21.10.62 | 10.21.10.63 |
| 42 | 10.21.10.64/26 | 10.21.10.65 – 10.21.10.126 | 10.21.10.127 |
| 43 | 10.21.10.128/26 | 10.21.10.129 – 10.21.10.190 | 10.21.10.191 |
| 44 | 10.21.10.192/26 | 10.21.10.193 – 10.21.10.254 | 10.21.10.255 |
| 45 | 10.21.11.0/26 | 10.21.11.1 – 10.21.11.62 | 10.21.11.63 |
| 46 | 10.21.11.64/26 | 10.21.11.65 – 10.21.11.126 | 10.21.11.127 |
| 47 | 10.21.11.128/26 | 10.21.11.129 – 10.21.11.190 | 10.21.11.191 |
| 48 | 10.21.11.192/26 | 10.21.11.193 – 10.21.11.254 | 10.21.11.255 |
| 49 | 10.21.12.0/26 | 10.21.12.1 – 10.21.12.62 | 10.21.12.63 |
| 50 | 10.21.12.64/26 | 10.21.12.65 – 10.21.12.126 | 10.21.12.127 |
| 51 | 10.21.12.128/26 | 10.21.12.129 – 10.21.12.190 | 10.21.12.191 |
| 52 | 10.21.12.192/26 | 10.21.12.193 – 10.21.12.254 | 10.21.12.255 |
| 53 | 10.21.13.0/26 | 10.21.13.1 – 10.21.13.62 | 10.21.13.63 |
| 54 | 10.21.13.64/26 | 10.21.13.65 – 10.21.13.126 | 10.21.13.127 |
| 55 | 10.21.13.128/26 | 10.21.13.129 – 10.21.13.190 | 10.21.13.191 |
| 56 | 10.21.13.192/26 | 10.21.13.193 – 10.21.13.254 | 10.21.13.255 |
| 57 | 10.21.14.0/26 | 10.21.14.1 – 10.21.14.62 | 10.21.14.63 |
| 58 | 10.21.14.64/26 | 10.21.14.65 – 10.21.14.126 | 10.21.14.127 |
| 59 | 10.21.14.128/26 | 10.21.14.129 – 10.21.14.190 | 10.21.14.191 |
| 60 | 10.21.14.192/26 | 10.21.14.193 – 10.21.14.254 | 10.21.14.255 |
| 61 | 10.21.15.0/26 | 10.21.15.1 – 10.21.15.62 | 10.21.15.63 |
| 62 | 10.21.15.64/26 | 10.21.15.65 – 10.21.15.126 | 10.21.15.127 |
| 63 | 10.21.15.128/26 | 10.21.15.129 – 10.21.15.190 | 10.21.15.191 |
| 64 | 10.21.15.192/26 | 10.21.15.193 – 10.21.15.254 | 10.21.15.255 |
| 65 | 10.21.16.0/26 | 10.21.16.1 – 10.21.16.62 | 10.21.16.63 |
| 66 | 10.21.16.64/26 | 10.21.16.65 – 10.21.16.126 | 10.21.16.127 |
| 67 | 10.21.16.128/26 | 10.21.16.129 – 10.21.16.190 | 10.21.16.191 |
| 68 | 10.21.16.192/26 | 10.21.16.193 – 10.21.16.254 | 10.21.16.255 |
| 69 | 10.21.17.0/26 | 10.21.17.1 – 10.21.17.62 | 10.21.17.63 |
| 70 | 10.21.17.64/26 | 10.21.17.65 – 10.21.17.126 | 10.21.17.127 |
| 71 | 10.21.17.128/26 | 10.21.17.129 – 10.21.17.190 | 10.21.17.191 |
| 72 | 10.21.17.192/26 | 10.21.17.193 – 10.21.17.254 | 10.21.17.255 |
| 73 | 10.21.18.0/26 | 10.21.18.1 – 10.21.18.62 | 10.21.18.63 |
| 74 | 10.21.18.64/26 | 10.21.18.65 – 10.21.18.126 | 10.21.18.127 |
| 75 | 10.21.18.128/26 | 10.21.18.129 – 10.21.18.190 | 10.21.18.191 |
| 76 | 10.21.18.192/26 | 10.21.18.193 – 10.21.18.254 | 10.21.18.255 |
| 77 | 10.21.19.0/26 | 10.21.19.1 – 10.21.19.62 | 10.21.19.63 |
| 78 | 10.21.19.64/26 | 10.21.19.65 – 10.21.19.126 | 10.21.19.127 |
| 79 | 10.21.19.128/26 | 10.21.19.129 – 10.21.19.190 | 10.21.19.191 |
| 80 | 10.21.19.192/26 | 10.21.19.193 – 10.21.19.254 | 10.21.19.255 |
| 81 | 10.21.20.0/26 | 10.21.20.1 – 10.21.20.62 | 10.21.20.63 |
| 82 | 10.21.20.64/26 | 10.21.20.65 – 10.21.20.126 | 10.21.20.127 |
| 83 | 10.21.20.128/26 | 10.21.20.129 – 10.21.20.190 | 10.21.20.191 |
| 84 | 10.21.20.192/26 | 10.21.20.193 – 10.21.20.254 | 10.21.20.255 |
| 85 | 10.21.21.0/26 | 10.21.21.1 – 10.21.21.62 | 10.21.21.63 |
| 86 | 10.21.21.64/26 | 10.21.21.65 – 10.21.21.126 | 10.21.21.127 |
| 87 | 10.21.21.128/26 | 10.21.21.129 – 10.21.21.190 | 10.21.21.191 |
| 88 | 10.21.21.192/26 | 10.21.21.193 – 10.21.21.254 | 10.21.21.255 |
| 89 | 10.21.22.0/26 | 10.21.22.1 – 10.21.22.62 | 10.21.22.63 |
| 90 | 10.21.22.64/26 | 10.21.22.65 – 10.21.22.126 | 10.21.22.127 |
| 91 | 10.21.22.128/26 | 10.21.22.129 – 10.21.22.190 | 10.21.22.191 |
| 92 | 10.21.22.192/26 | 10.21.22.193 – 10.21.22.254 | 10.21.22.255 |
| 93 | 10.21.23.0/26 | 10.21.23.1 – 10.21.23.62 | 10.21.23.63 |
| 94 | 10.21.23.64/26 | 10.21.23.65 – 10.21.23.126 | 10.21.23.127 |
| 95 | 10.21.23.128/26 | 10.21.23.129 – 10.21.23.190 | 10.21.23.191 |
| 96 | 10.21.23.192/26 | 10.21.23.193 – 10.21.23.254 | 10.21.23.255 |
| 97 | 10.21.24.0/26 | 10.21.24.1 – 10.21.24.62 | 10.21.24.63 |
| 98 | 10.21.24.64/26 | 10.21.24.65 – 10.21.24.126 | 10.21.24.127 |
| 99 | 10.21.24.128/26 | 10.21.24.129 – 10.21.24.190 | 10.21.24.191 |
| 100 | 10.21.24.192/26 | 10.21.24.193 – 10.21.24.254 | 10.21.24.255 |
| 101 | 10.21.25.0/26 | 10.21.25.1 – 10.21.25.62 | 10.21.25.63 |
| 102 | 10.21.25.64/26 | 10.21.25.65 – 10.21.25.126 | 10.21.25.127 |
| 103 | 10.21.25.128/26 | 10.21.25.129 – 10.21.25.190 | 10.21.25.191 |
| 104 | 10.21.25.192/26 | 10.21.25.193 – 10.21.25.254 | 10.21.25.255 |
| 105 | 10.21.26.0/26 | 10.21.26.1 – 10.21.26.62 | 10.21.26.63 |
| 106 | 10.21.26.64/26 | 10.21.26.65 – 10.21.26.126 | 10.21.26.127 |
| 107 | 10.21.26.128/26 | 10.21.26.129 – 10.21.26.190 | 10.21.26.191 |
| 108 | 10.21.26.192/26 | 10.21.26.193 – 10.21.26.254 | 10.21.26.255 |
| 109 | 10.21.27.0/26 | 10.21.27.1 – 10.21.27.62 | 10.21.27.63 |
| 110 | 10.21.27.64/26 | 10.21.27.65 – 10.21.27.126 | 10.21.27.127 |
| 111 | 10.21.27.128/26 | 10.21.27.129 – 10.21.27.190 | 10.21.27.191 |
| 112 | 10.21.27.192/26 | 10.21.27.193 – 10.21.27.254 | 10.21.27.255 |
| 113 | 10.21.28.0/26 | 10.21.28.1 – 10.21.28.62 | 10.21.28.63 |
| 114 | 10.21.28.64/26 | 10.21.28.65 – 10.21.28.126 | 10.21.28.127 |
| 115 | 10.21.28.128/26 | 10.21.28.129 – 10.21.28.190 | 10.21.28.191 |
| 116 | 10.21.28.192/26 | 10.21.28.193 – 10.21.28.254 | 10.21.28.255 |
| 117 | 10.21.29.0/26 | 10.21.29.1 – 10.21.29.62 | 10.21.29.63 |
| 118 | 10.21.29.64/26 | 10.21.29.65 – 10.21.29.126 | 10.21.29.127 |
| 119 | 10.21.29.128/26 | 10.21.29.129 – 10.21.29.190 | 10.21.29.191 |
| 120 | 10.21.29.192/26 | 10.21.29.193 – 10.21.29.254 | 10.21.29.255 |
| 121 | 10.21.30.0/26 | 10.21.30.1 – 10.21.30.62 | 10.21.30.63 |
| 122 | 10.21.30.64/26 | 10.21.30.65 – 10.21.30.126 | 10.21.30.127 |
| 123 | 10.21.30.128/26 | 10.21.30.129 – 10.21.30.190 | 10.21.30.191 |
| 124 | 10.21.30.192/26 | 10.21.30.193 – 10.21.30.254 | 10.21.30.255 |
| 125 | 10.21.31.0/26 | 10.21.31.1 – 10.21.31.62 | 10.21.31.63 |
| 126 | 10.21.31.64/26 | 10.21.31.65 – 10.21.31.126 | 10.21.31.127 |
| 127 | 10.21.31.128/26 | 10.21.31.129 – 10.21.31.190 | 10.21.31.191 |
| 128 | 10.21.31.192/26 | 10.21.31.193 – 10.21.31.254 | 10.21.31.255 |
| 129 | 10.21.32.0/26 | 10.21.32.1 – 10.21.32.62 | 10.21.32.63 |
| 130 | 10.21.32.64/26 | 10.21.32.65 – 10.21.32.126 | 10.21.32.127 |
| 131 | 10.21.32.128/26 | 10.21.32.129 – 10.21.32.190 | 10.21.32.191 |
| 132 | 10.21.32.192/26 | 10.21.32.193 – 10.21.32.254 | 10.21.32.255 |
| 133 | 10.21.33.0/26 | 10.21.33.1 – 10.21.33.62 | 10.21.33.63 |
| 134 | 10.21.33.64/26 | 10.21.33.65 – 10.21.33.126 | 10.21.33.127 |
| 135 | 10.21.33.128/26 | 10.21.33.129 – 10.21.33.190 | 10.21.33.191 |
| 136 | 10.21.33.192/26 | 10.21.33.193 – 10.21.33.254 | 10.21.33.255 |
| 137 | 10.21.34.0/26 | 10.21.34.1 – 10.21.34.62 | 10.21.34.63 |
| 138 | 10.21.34.64/26 | 10.21.34.65 – 10.21.34.126 | 10.21.34.127 |
| 139 | 10.21.34.128/26 | 10.21.34.129 – 10.21.34.190 | 10.21.34.191 |
| 140 | 10.21.34.192/26 | 10.21.34.193 – 10.21.34.254 | 10.21.34.255 |
| 141 | 10.21.35.0/26 | 10.21.35.1 – 10.21.35.62 | 10.21.35.63 |
| 142 | 10.21.35.64/26 | 10.21.35.65 – 10.21.35.126 | 10.21.35.127 |
| 143 | 10.21.35.128/26 | 10.21.35.129 – 10.21.35.190 | 10.21.35.191 |
| 144 | 10.21.35.192/26 | 10.21.35.193 – 10.21.35.254 | 10.21.35.255 |
| 145 | 10.21.36.0/26 | 10.21.36.1 – 10.21.36.62 | 10.21.36.63 |
| 146 | 10.21.36.64/26 | 10.21.36.65 – 10.21.36.126 | 10.21.36.127 |
| 147 | 10.21.36.128/26 | 10.21.36.129 – 10.21.36.190 | 10.21.36.191 |
| 148 | 10.21.36.192/26 | 10.21.36.193 – 10.21.36.254 | 10.21.36.255 |
| 149 | 10.21.37.0/26 | 10.21.37.1 – 10.21.37.62 | 10.21.37.63 |
| 150 | 10.21.37.64/26 | 10.21.37.65 – 10.21.37.126 | 10.21.37.127 |
| 151 | 10.21.37.128/26 | 10.21.37.129 – 10.21.37.190 | 10.21.37.191 |
| 152 | 10.21.37.192/26 | 10.21.37.193 – 10.21.37.254 | 10.21.37.255 |
| 153 | 10.21.38.0/26 | 10.21.38.1 – 10.21.38.62 | 10.21.38.63 |
| 154 | 10.21.38.64/26 | 10.21.38.65 – 10.21.38.126 | 10.21.38.127 |
| 155 | 10.21.38.128/26 | 10.21.38.129 – 10.21.38.190 | 10.21.38.191 |
| 156 | 10.21.38.192/26 | 10.21.38.193 – 10.21.38.254 | 10.21.38.255 |
| 157 | 10.21.39.0/26 | 10.21.39.1 – 10.21.39.62 | 10.21.39.63 |
| 158 | 10.21.39.64/26 | 10.21.39.65 – 10.21.39.126 | 10.21.39.127 |
| 159 | 10.21.39.128/26 | 10.21.39.129 – 10.21.39.190 | 10.21.39.191 |
| 160 | 10.21.39.192/26 | 10.21.39.193 – 10.21.39.254 | 10.21.39.255 |
| 161 | 10.21.40.0/26 | 10.21.40.1 – 10.21.40.62 | 10.21.40.63 |
| 162 | 10.21.40.64/26 | 10.21.40.65 – 10.21.40.126 | 10.21.40.127 |
| 163 | 10.21.40.128/26 | 10.21.40.129 – 10.21.40.190 | 10.21.40.191 |
| 164 | 10.21.40.192/26 | 10.21.40.193 – 10.21.40.254 | 10.21.40.255 |
| 165 | 10.21.41.0/26 | 10.21.41.1 – 10.21.41.62 | 10.21.41.63 |
| 166 | 10.21.41.64/26 | 10.21.41.65 – 10.21.41.126 | 10.21.41.127 |
| 167 | 10.21.41.128/26 | 10.21.41.129 – 10.21.41.190 | 10.21.41.191 |
| 168 | 10.21.41.192/26 | 10.21.41.193 – 10.21.41.254 | 10.21.41.255 |
| 169 | 10.21.42.0/26 | 10.21.42.1 – 10.21.42.62 | 10.21.42.63 |
| 170 | 10.21.42.64/26 | 10.21.42.65 – 10.21.42.126 | 10.21.42.127 |
| 171 | 10.21.42.128/26 | 10.21.42.129 – 10.21.42.190 | 10.21.42.191 |
| 172 | 10.21.42.192/26 | 10.21.42.193 – 10.21.42.254 | 10.21.42.255 |
| 173 | 10.21.43.0/26 | 10.21.43.1 – 10.21.43.62 | 10.21.43.63 |
| 174 | 10.21.43.64/26 | 10.21.43.65 – 10.21.43.126 | 10.21.43.127 |
| 175 | 10.21.43.128/26 | 10.21.43.129 – 10.21.43.190 | 10.21.43.191 |
| 176 | 10.21.43.192/26 | 10.21.43.193 – 10.21.43.254 | 10.21.43.255 |
| 177 | 10.21.44.0/26 | 10.21.44.1 – 10.21.44.62 | 10.21.44.63 |
| 178 | 10.21.44.64/26 | 10.21.44.65 – 10.21.44.126 | 10.21.44.127 |
| 179 | 10.21.44.128/26 | 10.21.44.129 – 10.21.44.190 | 10.21.44.191 |
| 180 | 10.21.44.192/26 | 10.21.44.193 – 10.21.44.254 | 10.21.44.255 |
| 181 | 10.21.45.0/26 | 10.21.45.1 – 10.21.45.62 | 10.21.45.63 |
| 182 | 10.21.45.64/26 | 10.21.45.65 – 10.21.45.126 | 10.21.45.127 |
| 183 | 10.21.45.128/26 | 10.21.45.129 – 10.21.45.190 | 10.21.45.191 |
| 184 | 10.21.45.192/26 | 10.21.45.193 – 10.21.45.254 | 10.21.45.255 |
| 185 | 10.21.46.0/26 | 10.21.46.1 – 10.21.46.62 | 10.21.46.63 |
| 186 | 10.21.46.64/26 | 10.21.46.65 – 10.21.46.126 | 10.21.46.127 |
| 187 | 10.21.46.128/26 | 10.21.46.129 – 10.21.46.190 | 10.21.46.191 |
| 188 | 10.21.46.192/26 | 10.21.46.193 – 10.21.46.254 | 10.21.46.255 |
| 189 | 10.21.47.0/26 | 10.21.47.1 – 10.21.47.62 | 10.21.47.63 |
| 190 | 10.21.47.64/26 | 10.21.47.65 – 10.21.47.126 | 10.21.47.127 |
| 191 | 10.21.47.128/26 | 10.21.47.129 – 10.21.47.190 | 10.21.47.191 |
| 192 | 10.21.47.192/26 | 10.21.47.193 – 10.21.47.254 | 10.21.47.255 |
| 193 | 10.21.48.0/26 | 10.21.48.1 – 10.21.48.62 | 10.21.48.63 |
| 194 | 10.21.48.64/26 | 10.21.48.65 – 10.21.48.126 | 10.21.48.127 |
| 195 | 10.21.48.128/26 | 10.21.48.129 – 10.21.48.190 | 10.21.48.191 |
| 196 | 10.21.48.192/26 | 10.21.48.193 – 10.21.48.254 | 10.21.48.255 |
| 197 | 10.21.49.0/26 | 10.21.49.1 – 10.21.49.62 | 10.21.49.63 |
| 198 | 10.21.49.64/26 | 10.21.49.65 – 10.21.49.126 | 10.21.49.127 |
| 199 | 10.21.49.128/26 | 10.21.49.129 – 10.21.49.190 | 10.21.49.191 |
| 200 | 10.21.49.192/26 | 10.21.49.193 – 10.21.49.254 | 10.21.49.255 |
| 201 | 10.21.50.0/26 | 10.21.50.1 – 10.21.50.62 | 10.21.50.63 |
| 202 | 10.21.50.64/26 | 10.21.50.65 – 10.21.50.126 | 10.21.50.127 |
| 203 | 10.21.50.128/26 | 10.21.50.129 – 10.21.50.190 | 10.21.50.191 |
| 204 | 10.21.50.192/26 | 10.21.50.193 – 10.21.50.254 | 10.21.50.255 |
| 205 | 10.21.51.0/26 | 10.21.51.1 – 10.21.51.62 | 10.21.51.63 |
| 206 | 10.21.51.64/26 | 10.21.51.65 – 10.21.51.126 | 10.21.51.127 |
| 207 | 10.21.51.128/26 | 10.21.51.129 – 10.21.51.190 | 10.21.51.191 |
| 208 | 10.21.51.192/26 | 10.21.51.193 – 10.21.51.254 | 10.21.51.255 |
| 209 | 10.21.52.0/26 | 10.21.52.1 – 10.21.52.62 | 10.21.52.63 |
| 210 | 10.21.52.64/26 | 10.21.52.65 – 10.21.52.126 | 10.21.52.127 |
| 211 | 10.21.52.128/26 | 10.21.52.129 – 10.21.52.190 | 10.21.52.191 |
| 212 | 10.21.52.192/26 | 10.21.52.193 – 10.21.52.254 | 10.21.52.255 |
| 213 | 10.21.53.0/26 | 10.21.53.1 – 10.21.53.62 | 10.21.53.63 |
| 214 | 10.21.53.64/26 | 10.21.53.65 – 10.21.53.126 | 10.21.53.127 |
| 215 | 10.21.53.128/26 | 10.21.53.129 – 10.21.53.190 | 10.21.53.191 |
| 216 | 10.21.53.192/26 | 10.21.53.193 – 10.21.53.254 | 10.21.53.255 |
| 217 | 10.21.54.0/26 | 10.21.54.1 – 10.21.54.62 | 10.21.54.63 |
| 218 | 10.21.54.64/26 | 10.21.54.65 – 10.21.54.126 | 10.21.54.127 |
| 219 | 10.21.54.128/26 | 10.21.54.129 – 10.21.54.190 | 10.21.54.191 |
| 220 | 10.21.54.192/26 | 10.21.54.193 – 10.21.54.254 | 10.21.54.255 |
| 221 | 10.21.55.0/26 | 10.21.55.1 – 10.21.55.62 | 10.21.55.63 |
| 222 | 10.21.55.64/26 | 10.21.55.65 – 10.21.55.126 | 10.21.55.127 |
| 223 | 10.21.55.128/26 | 10.21.55.129 – 10.21.55.190 | 10.21.55.191 |
| 224 | 10.21.55.192/26 | 10.21.55.193 – 10.21.55.254 | 10.21.55.255 |
| 225 | 10.21.56.0/26 | 10.21.56.1 – 10.21.56.62 | 10.21.56.63 |
| 226 | 10.21.56.64/26 | 10.21.56.65 – 10.21.56.126 | 10.21.56.127 |
| 227 | 10.21.56.128/26 | 10.21.56.129 – 10.21.56.190 | 10.21.56.191 |
| 228 | 10.21.56.192/26 | 10.21.56.193 – 10.21.56.254 | 10.21.56.255 |
| 229 | 10.21.57.0/26 | 10.21.57.1 – 10.21.57.62 | 10.21.57.63 |
| 230 | 10.21.57.64/26 | 10.21.57.65 – 10.21.57.126 | 10.21.57.127 |
| 231 | 10.21.57.128/26 | 10.21.57.129 – 10.21.57.190 | 10.21.57.191 |
| 232 | 10.21.57.192/26 | 10.21.57.193 – 10.21.57.254 | 10.21.57.255 |
| 233 | 10.21.58.0/26 | 10.21.58.1 – 10.21.58.62 | 10.21.58.63 |
| 234 | 10.21.58.64/26 | 10.21.58.65 – 10.21.58.126 | 10.21.58.127 |
| 235 | 10.21.58.128/26 | 10.21.58.129 – 10.21.58.190 | 10.21.58.191 |
| 236 | 10.21.58.192/26 | 10.21.58.193 – 10.21.58.254 | 10.21.58.255 |
| 237 | 10.21.59.0/26 | 10.21.59.1 – 10.21.59.62 | 10.21.59.63 |
| 238 | 10.21.59.64/26 | 10.21.59.65 – 10.21.59.126 | 10.21.59.127 |
| 239 | 10.21.59.128/26 | 10.21.59.129 – 10.21.59.190 | 10.21.59.191 |
| 240 | 10.21.59.192/26 | 10.21.59.193 – 10.21.59.254 | 10.21.59.255 |
| 241 | 10.21.60.0/26 | 10.21.60.1 – 10.21.60.62 | 10.21.60.63 |
| 242 | 10.21.60.64/26 | 10.21.60.65 – 10.21.60.126 | 10.21.60.127 |
| 243 | 10.21.60.128/26 | 10.21.60.129 – 10.21.60.190 | 10.21.60.191 |
| 244 | 10.21.60.192/26 | 10.21.60.193 – 10.21.60.254 | 10.21.60.255 |
| 245 | 10.21.61.0/26 | 10.21.61.1 – 10.21.61.62 | 10.21.61.63 |
| 246 | 10.21.61.64/26 | 10.21.61.65 – 10.21.61.126 | 10.21.61.127 |
| 247 | 10.21.61.128/26 | 10.21.61.129 – 10.21.61.190 | 10.21.61.191 |
| 248 | 10.21.61.192/26 | 10.21.61.193 – 10.21.61.254 | 10.21.61.255 |
| 249 | 10.21.62.0/26 | 10.21.62.1 – 10.21.62.62 | 10.21.62.63 |
| 250 | 10.21.62.64/26 | 10.21.62.65 – 10.21.62.126 | 10.21.62.127 |
| 251 | 10.21.62.128/26 | 10.21.62.129 – 10.21.62.190 | 10.21.62.191 |
| 252 | 10.21.62.192/26 | 10.21.62.193 – 10.21.62.254 | 10.21.62.255 |
| 253 | 10.21.63.0/26 | 10.21.63.1 – 10.21.63.62 | 10.21.63.63 |
| 254 | 10.21.63.64/26 | 10.21.63.65 – 10.21.63.126 | 10.21.63.127 |
| 255 | 10.21.63.128/26 | 10.21.63.129 – 10.21.63.190 | 10.21.63.191 |
| 256 | 10.21.63.192/26 | 10.21.63.193 – 10.21.63.254 | 10.21.63.255 |
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 /17 |
|---|---|---|---|---|
| /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 | 1 |
| /18 | 255.255.192.0 | 16,384 | 16,382 | 2 split → |
| /19 | 255.255.224.0 | 8,192 | 8,190 | 4 split → |
| /20 | 255.255.240.0 | 4,096 | 4,094 | 8 split → |
| /21 | 255.255.248.0 | 2,048 | 2,046 | 16 split → |
| /22 | 255.255.252.0 | 1,024 | 1,022 | 32 split → |
| /23 | 255.255.254.0 | 512 | 510 | 64 split → |
| /24 | 255.255.255.0 | 256 | 254 | 128 split → |
| /25 | 255.255.255.128 | 128 | 126 | 256 split → |
| /26 | 255.255.255.192 | 64 | 62 | 512 split → |
| /27 | 255.255.255.224 | 32 | 30 | 1,024 split → |
| /28 | 255.255.255.240 | 16 | 14 | 2,048 split → |
| /29 | 255.255.255.248 | 8 | 6 | 4,096 split → |
| /30 | 255.255.255.252 | 4 | 2 | 8,192 split → |
| /31 | 255.255.255.254 | 2 | 2 | 16,384 split → |
| /32 | 255.255.255.255 | 1 | 1 | 32,768 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.