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)10.167.121.0/25
network10.167.121.0/25
broadcast10.167.121.127
first host10.167.121.1
last host10.167.121.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.121.0/25
address00001010.10100111.01111001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.01111001.00000000
broadcast00001010.10100111.01111001.01111111
green = network part, grey = host part
hex0x0aa77900
decimal178747648
reverse dns0.121.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:7900
/25 split into /32 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.167.121.0/32 | 10.167.121.0 – 10.167.121.0 | 10.167.121.0 |
| 2 | 10.167.121.1/32 | 10.167.121.1 – 10.167.121.1 | 10.167.121.1 |
| 3 | 10.167.121.2/32 | 10.167.121.2 – 10.167.121.2 | 10.167.121.2 |
| 4 | 10.167.121.3/32 | 10.167.121.3 – 10.167.121.3 | 10.167.121.3 |
| 5 | 10.167.121.4/32 | 10.167.121.4 – 10.167.121.4 | 10.167.121.4 |
| 6 | 10.167.121.5/32 | 10.167.121.5 – 10.167.121.5 | 10.167.121.5 |
| 7 | 10.167.121.6/32 | 10.167.121.6 – 10.167.121.6 | 10.167.121.6 |
| 8 | 10.167.121.7/32 | 10.167.121.7 – 10.167.121.7 | 10.167.121.7 |
| 9 | 10.167.121.8/32 | 10.167.121.8 – 10.167.121.8 | 10.167.121.8 |
| 10 | 10.167.121.9/32 | 10.167.121.9 – 10.167.121.9 | 10.167.121.9 |
| 11 | 10.167.121.10/32 | 10.167.121.10 – 10.167.121.10 | 10.167.121.10 |
| 12 | 10.167.121.11/32 | 10.167.121.11 – 10.167.121.11 | 10.167.121.11 |
| 13 | 10.167.121.12/32 | 10.167.121.12 – 10.167.121.12 | 10.167.121.12 |
| 14 | 10.167.121.13/32 | 10.167.121.13 – 10.167.121.13 | 10.167.121.13 |
| 15 | 10.167.121.14/32 | 10.167.121.14 – 10.167.121.14 | 10.167.121.14 |
| 16 | 10.167.121.15/32 | 10.167.121.15 – 10.167.121.15 | 10.167.121.15 |
| 17 | 10.167.121.16/32 | 10.167.121.16 – 10.167.121.16 | 10.167.121.16 |
| 18 | 10.167.121.17/32 | 10.167.121.17 – 10.167.121.17 | 10.167.121.17 |
| 19 | 10.167.121.18/32 | 10.167.121.18 – 10.167.121.18 | 10.167.121.18 |
| 20 | 10.167.121.19/32 | 10.167.121.19 – 10.167.121.19 | 10.167.121.19 |
| 21 | 10.167.121.20/32 | 10.167.121.20 – 10.167.121.20 | 10.167.121.20 |
| 22 | 10.167.121.21/32 | 10.167.121.21 – 10.167.121.21 | 10.167.121.21 |
| 23 | 10.167.121.22/32 | 10.167.121.22 – 10.167.121.22 | 10.167.121.22 |
| 24 | 10.167.121.23/32 | 10.167.121.23 – 10.167.121.23 | 10.167.121.23 |
| 25 | 10.167.121.24/32 | 10.167.121.24 – 10.167.121.24 | 10.167.121.24 |
| 26 | 10.167.121.25/32 | 10.167.121.25 – 10.167.121.25 | 10.167.121.25 |
| 27 | 10.167.121.26/32 | 10.167.121.26 – 10.167.121.26 | 10.167.121.26 |
| 28 | 10.167.121.27/32 | 10.167.121.27 – 10.167.121.27 | 10.167.121.27 |
| 29 | 10.167.121.28/32 | 10.167.121.28 – 10.167.121.28 | 10.167.121.28 |
| 30 | 10.167.121.29/32 | 10.167.121.29 – 10.167.121.29 | 10.167.121.29 |
| 31 | 10.167.121.30/32 | 10.167.121.30 – 10.167.121.30 | 10.167.121.30 |
| 32 | 10.167.121.31/32 | 10.167.121.31 – 10.167.121.31 | 10.167.121.31 |
| 33 | 10.167.121.32/32 | 10.167.121.32 – 10.167.121.32 | 10.167.121.32 |
| 34 | 10.167.121.33/32 | 10.167.121.33 – 10.167.121.33 | 10.167.121.33 |
| 35 | 10.167.121.34/32 | 10.167.121.34 – 10.167.121.34 | 10.167.121.34 |
| 36 | 10.167.121.35/32 | 10.167.121.35 – 10.167.121.35 | 10.167.121.35 |
| 37 | 10.167.121.36/32 | 10.167.121.36 – 10.167.121.36 | 10.167.121.36 |
| 38 | 10.167.121.37/32 | 10.167.121.37 – 10.167.121.37 | 10.167.121.37 |
| 39 | 10.167.121.38/32 | 10.167.121.38 – 10.167.121.38 | 10.167.121.38 |
| 40 | 10.167.121.39/32 | 10.167.121.39 – 10.167.121.39 | 10.167.121.39 |
| 41 | 10.167.121.40/32 | 10.167.121.40 – 10.167.121.40 | 10.167.121.40 |
| 42 | 10.167.121.41/32 | 10.167.121.41 – 10.167.121.41 | 10.167.121.41 |
| 43 | 10.167.121.42/32 | 10.167.121.42 – 10.167.121.42 | 10.167.121.42 |
| 44 | 10.167.121.43/32 | 10.167.121.43 – 10.167.121.43 | 10.167.121.43 |
| 45 | 10.167.121.44/32 | 10.167.121.44 – 10.167.121.44 | 10.167.121.44 |
| 46 | 10.167.121.45/32 | 10.167.121.45 – 10.167.121.45 | 10.167.121.45 |
| 47 | 10.167.121.46/32 | 10.167.121.46 – 10.167.121.46 | 10.167.121.46 |
| 48 | 10.167.121.47/32 | 10.167.121.47 – 10.167.121.47 | 10.167.121.47 |
| 49 | 10.167.121.48/32 | 10.167.121.48 – 10.167.121.48 | 10.167.121.48 |
| 50 | 10.167.121.49/32 | 10.167.121.49 – 10.167.121.49 | 10.167.121.49 |
| 51 | 10.167.121.50/32 | 10.167.121.50 – 10.167.121.50 | 10.167.121.50 |
| 52 | 10.167.121.51/32 | 10.167.121.51 – 10.167.121.51 | 10.167.121.51 |
| 53 | 10.167.121.52/32 | 10.167.121.52 – 10.167.121.52 | 10.167.121.52 |
| 54 | 10.167.121.53/32 | 10.167.121.53 – 10.167.121.53 | 10.167.121.53 |
| 55 | 10.167.121.54/32 | 10.167.121.54 – 10.167.121.54 | 10.167.121.54 |
| 56 | 10.167.121.55/32 | 10.167.121.55 – 10.167.121.55 | 10.167.121.55 |
| 57 | 10.167.121.56/32 | 10.167.121.56 – 10.167.121.56 | 10.167.121.56 |
| 58 | 10.167.121.57/32 | 10.167.121.57 – 10.167.121.57 | 10.167.121.57 |
| 59 | 10.167.121.58/32 | 10.167.121.58 – 10.167.121.58 | 10.167.121.58 |
| 60 | 10.167.121.59/32 | 10.167.121.59 – 10.167.121.59 | 10.167.121.59 |
| 61 | 10.167.121.60/32 | 10.167.121.60 – 10.167.121.60 | 10.167.121.60 |
| 62 | 10.167.121.61/32 | 10.167.121.61 – 10.167.121.61 | 10.167.121.61 |
| 63 | 10.167.121.62/32 | 10.167.121.62 – 10.167.121.62 | 10.167.121.62 |
| 64 | 10.167.121.63/32 | 10.167.121.63 – 10.167.121.63 | 10.167.121.63 |
| 65 | 10.167.121.64/32 | 10.167.121.64 – 10.167.121.64 | 10.167.121.64 |
| 66 | 10.167.121.65/32 | 10.167.121.65 – 10.167.121.65 | 10.167.121.65 |
| 67 | 10.167.121.66/32 | 10.167.121.66 – 10.167.121.66 | 10.167.121.66 |
| 68 | 10.167.121.67/32 | 10.167.121.67 – 10.167.121.67 | 10.167.121.67 |
| 69 | 10.167.121.68/32 | 10.167.121.68 – 10.167.121.68 | 10.167.121.68 |
| 70 | 10.167.121.69/32 | 10.167.121.69 – 10.167.121.69 | 10.167.121.69 |
| 71 | 10.167.121.70/32 | 10.167.121.70 – 10.167.121.70 | 10.167.121.70 |
| 72 | 10.167.121.71/32 | 10.167.121.71 – 10.167.121.71 | 10.167.121.71 |
| 73 | 10.167.121.72/32 | 10.167.121.72 – 10.167.121.72 | 10.167.121.72 |
| 74 | 10.167.121.73/32 | 10.167.121.73 – 10.167.121.73 | 10.167.121.73 |
| 75 | 10.167.121.74/32 | 10.167.121.74 – 10.167.121.74 | 10.167.121.74 |
| 76 | 10.167.121.75/32 | 10.167.121.75 – 10.167.121.75 | 10.167.121.75 |
| 77 | 10.167.121.76/32 | 10.167.121.76 – 10.167.121.76 | 10.167.121.76 |
| 78 | 10.167.121.77/32 | 10.167.121.77 – 10.167.121.77 | 10.167.121.77 |
| 79 | 10.167.121.78/32 | 10.167.121.78 – 10.167.121.78 | 10.167.121.78 |
| 80 | 10.167.121.79/32 | 10.167.121.79 – 10.167.121.79 | 10.167.121.79 |
| 81 | 10.167.121.80/32 | 10.167.121.80 – 10.167.121.80 | 10.167.121.80 |
| 82 | 10.167.121.81/32 | 10.167.121.81 – 10.167.121.81 | 10.167.121.81 |
| 83 | 10.167.121.82/32 | 10.167.121.82 – 10.167.121.82 | 10.167.121.82 |
| 84 | 10.167.121.83/32 | 10.167.121.83 – 10.167.121.83 | 10.167.121.83 |
| 85 | 10.167.121.84/32 | 10.167.121.84 – 10.167.121.84 | 10.167.121.84 |
| 86 | 10.167.121.85/32 | 10.167.121.85 – 10.167.121.85 | 10.167.121.85 |
| 87 | 10.167.121.86/32 | 10.167.121.86 – 10.167.121.86 | 10.167.121.86 |
| 88 | 10.167.121.87/32 | 10.167.121.87 – 10.167.121.87 | 10.167.121.87 |
| 89 | 10.167.121.88/32 | 10.167.121.88 – 10.167.121.88 | 10.167.121.88 |
| 90 | 10.167.121.89/32 | 10.167.121.89 – 10.167.121.89 | 10.167.121.89 |
| 91 | 10.167.121.90/32 | 10.167.121.90 – 10.167.121.90 | 10.167.121.90 |
| 92 | 10.167.121.91/32 | 10.167.121.91 – 10.167.121.91 | 10.167.121.91 |
| 93 | 10.167.121.92/32 | 10.167.121.92 – 10.167.121.92 | 10.167.121.92 |
| 94 | 10.167.121.93/32 | 10.167.121.93 – 10.167.121.93 | 10.167.121.93 |
| 95 | 10.167.121.94/32 | 10.167.121.94 – 10.167.121.94 | 10.167.121.94 |
| 96 | 10.167.121.95/32 | 10.167.121.95 – 10.167.121.95 | 10.167.121.95 |
| 97 | 10.167.121.96/32 | 10.167.121.96 – 10.167.121.96 | 10.167.121.96 |
| 98 | 10.167.121.97/32 | 10.167.121.97 – 10.167.121.97 | 10.167.121.97 |
| 99 | 10.167.121.98/32 | 10.167.121.98 – 10.167.121.98 | 10.167.121.98 |
| 100 | 10.167.121.99/32 | 10.167.121.99 – 10.167.121.99 | 10.167.121.99 |
| 101 | 10.167.121.100/32 | 10.167.121.100 – 10.167.121.100 | 10.167.121.100 |
| 102 | 10.167.121.101/32 | 10.167.121.101 – 10.167.121.101 | 10.167.121.101 |
| 103 | 10.167.121.102/32 | 10.167.121.102 – 10.167.121.102 | 10.167.121.102 |
| 104 | 10.167.121.103/32 | 10.167.121.103 – 10.167.121.103 | 10.167.121.103 |
| 105 | 10.167.121.104/32 | 10.167.121.104 – 10.167.121.104 | 10.167.121.104 |
| 106 | 10.167.121.105/32 | 10.167.121.105 – 10.167.121.105 | 10.167.121.105 |
| 107 | 10.167.121.106/32 | 10.167.121.106 – 10.167.121.106 | 10.167.121.106 |
| 108 | 10.167.121.107/32 | 10.167.121.107 – 10.167.121.107 | 10.167.121.107 |
| 109 | 10.167.121.108/32 | 10.167.121.108 – 10.167.121.108 | 10.167.121.108 |
| 110 | 10.167.121.109/32 | 10.167.121.109 – 10.167.121.109 | 10.167.121.109 |
| 111 | 10.167.121.110/32 | 10.167.121.110 – 10.167.121.110 | 10.167.121.110 |
| 112 | 10.167.121.111/32 | 10.167.121.111 – 10.167.121.111 | 10.167.121.111 |
| 113 | 10.167.121.112/32 | 10.167.121.112 – 10.167.121.112 | 10.167.121.112 |
| 114 | 10.167.121.113/32 | 10.167.121.113 – 10.167.121.113 | 10.167.121.113 |
| 115 | 10.167.121.114/32 | 10.167.121.114 – 10.167.121.114 | 10.167.121.114 |
| 116 | 10.167.121.115/32 | 10.167.121.115 – 10.167.121.115 | 10.167.121.115 |
| 117 | 10.167.121.116/32 | 10.167.121.116 – 10.167.121.116 | 10.167.121.116 |
| 118 | 10.167.121.117/32 | 10.167.121.117 – 10.167.121.117 | 10.167.121.117 |
| 119 | 10.167.121.118/32 | 10.167.121.118 – 10.167.121.118 | 10.167.121.118 |
| 120 | 10.167.121.119/32 | 10.167.121.119 – 10.167.121.119 | 10.167.121.119 |
| 121 | 10.167.121.120/32 | 10.167.121.120 – 10.167.121.120 | 10.167.121.120 |
| 122 | 10.167.121.121/32 | 10.167.121.121 – 10.167.121.121 | 10.167.121.121 |
| 123 | 10.167.121.122/32 | 10.167.121.122 – 10.167.121.122 | 10.167.121.122 |
| 124 | 10.167.121.123/32 | 10.167.121.123 – 10.167.121.123 | 10.167.121.123 |
| 125 | 10.167.121.124/32 | 10.167.121.124 – 10.167.121.124 | 10.167.121.124 |
| 126 | 10.167.121.125/32 | 10.167.121.125 – 10.167.121.125 | 10.167.121.125 |
| 127 | 10.167.121.126/32 | 10.167.121.126 – 10.167.121.126 | 10.167.121.126 |
| 128 | 10.167.121.127/32 | 10.167.121.127 – 10.167.121.127 | 10.167.121.127 |
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 /25 |
|---|---|---|---|---|
| /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 | - |
| /22 | 255.255.252.0 | 1,024 | 1,022 | - |
| /23 | 255.255.254.0 | 512 | 510 | - |
| /24 | 255.255.255.0 | 256 | 254 | - |
| /25 | 255.255.255.128 | 128 | 126 | 1 |
| /26 | 255.255.255.192 | 64 | 62 | 2 split → |
| /27 | 255.255.255.224 | 32 | 30 | 4 split → |
| /28 | 255.255.255.240 | 16 | 14 | 8 split → |
| /29 | 255.255.255.248 | 8 | 6 | 16 split → |
| /30 | 255.255.255.252 | 4 | 2 | 32 split → |
| /31 | 255.255.255.254 | 2 | 2 | 64 split → |
| /32 | 255.255.255.255 | 1 | 1 | 128 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.