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)10.3.197.0/25
network10.3.197.0/25
broadcast10.3.197.127
first host10.3.197.1
last host10.3.197.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.197.0/25
address00001010.00000011.11000101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.11000101.00000000
broadcast00001010.00000011.11000101.01111111
green = network part, grey = host part
hex0x0a03c500
decimal168019200
reverse dns0.197.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:c500
/25 split into /32 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.3.197.0/32 | 10.3.197.0 – 10.3.197.0 | 10.3.197.0 |
| 2 | 10.3.197.1/32 | 10.3.197.1 – 10.3.197.1 | 10.3.197.1 |
| 3 | 10.3.197.2/32 | 10.3.197.2 – 10.3.197.2 | 10.3.197.2 |
| 4 | 10.3.197.3/32 | 10.3.197.3 – 10.3.197.3 | 10.3.197.3 |
| 5 | 10.3.197.4/32 | 10.3.197.4 – 10.3.197.4 | 10.3.197.4 |
| 6 | 10.3.197.5/32 | 10.3.197.5 – 10.3.197.5 | 10.3.197.5 |
| 7 | 10.3.197.6/32 | 10.3.197.6 – 10.3.197.6 | 10.3.197.6 |
| 8 | 10.3.197.7/32 | 10.3.197.7 – 10.3.197.7 | 10.3.197.7 |
| 9 | 10.3.197.8/32 | 10.3.197.8 – 10.3.197.8 | 10.3.197.8 |
| 10 | 10.3.197.9/32 | 10.3.197.9 – 10.3.197.9 | 10.3.197.9 |
| 11 | 10.3.197.10/32 | 10.3.197.10 – 10.3.197.10 | 10.3.197.10 |
| 12 | 10.3.197.11/32 | 10.3.197.11 – 10.3.197.11 | 10.3.197.11 |
| 13 | 10.3.197.12/32 | 10.3.197.12 – 10.3.197.12 | 10.3.197.12 |
| 14 | 10.3.197.13/32 | 10.3.197.13 – 10.3.197.13 | 10.3.197.13 |
| 15 | 10.3.197.14/32 | 10.3.197.14 – 10.3.197.14 | 10.3.197.14 |
| 16 | 10.3.197.15/32 | 10.3.197.15 – 10.3.197.15 | 10.3.197.15 |
| 17 | 10.3.197.16/32 | 10.3.197.16 – 10.3.197.16 | 10.3.197.16 |
| 18 | 10.3.197.17/32 | 10.3.197.17 – 10.3.197.17 | 10.3.197.17 |
| 19 | 10.3.197.18/32 | 10.3.197.18 – 10.3.197.18 | 10.3.197.18 |
| 20 | 10.3.197.19/32 | 10.3.197.19 – 10.3.197.19 | 10.3.197.19 |
| 21 | 10.3.197.20/32 | 10.3.197.20 – 10.3.197.20 | 10.3.197.20 |
| 22 | 10.3.197.21/32 | 10.3.197.21 – 10.3.197.21 | 10.3.197.21 |
| 23 | 10.3.197.22/32 | 10.3.197.22 – 10.3.197.22 | 10.3.197.22 |
| 24 | 10.3.197.23/32 | 10.3.197.23 – 10.3.197.23 | 10.3.197.23 |
| 25 | 10.3.197.24/32 | 10.3.197.24 – 10.3.197.24 | 10.3.197.24 |
| 26 | 10.3.197.25/32 | 10.3.197.25 – 10.3.197.25 | 10.3.197.25 |
| 27 | 10.3.197.26/32 | 10.3.197.26 – 10.3.197.26 | 10.3.197.26 |
| 28 | 10.3.197.27/32 | 10.3.197.27 – 10.3.197.27 | 10.3.197.27 |
| 29 | 10.3.197.28/32 | 10.3.197.28 – 10.3.197.28 | 10.3.197.28 |
| 30 | 10.3.197.29/32 | 10.3.197.29 – 10.3.197.29 | 10.3.197.29 |
| 31 | 10.3.197.30/32 | 10.3.197.30 – 10.3.197.30 | 10.3.197.30 |
| 32 | 10.3.197.31/32 | 10.3.197.31 – 10.3.197.31 | 10.3.197.31 |
| 33 | 10.3.197.32/32 | 10.3.197.32 – 10.3.197.32 | 10.3.197.32 |
| 34 | 10.3.197.33/32 | 10.3.197.33 – 10.3.197.33 | 10.3.197.33 |
| 35 | 10.3.197.34/32 | 10.3.197.34 – 10.3.197.34 | 10.3.197.34 |
| 36 | 10.3.197.35/32 | 10.3.197.35 – 10.3.197.35 | 10.3.197.35 |
| 37 | 10.3.197.36/32 | 10.3.197.36 – 10.3.197.36 | 10.3.197.36 |
| 38 | 10.3.197.37/32 | 10.3.197.37 – 10.3.197.37 | 10.3.197.37 |
| 39 | 10.3.197.38/32 | 10.3.197.38 – 10.3.197.38 | 10.3.197.38 |
| 40 | 10.3.197.39/32 | 10.3.197.39 – 10.3.197.39 | 10.3.197.39 |
| 41 | 10.3.197.40/32 | 10.3.197.40 – 10.3.197.40 | 10.3.197.40 |
| 42 | 10.3.197.41/32 | 10.3.197.41 – 10.3.197.41 | 10.3.197.41 |
| 43 | 10.3.197.42/32 | 10.3.197.42 – 10.3.197.42 | 10.3.197.42 |
| 44 | 10.3.197.43/32 | 10.3.197.43 – 10.3.197.43 | 10.3.197.43 |
| 45 | 10.3.197.44/32 | 10.3.197.44 – 10.3.197.44 | 10.3.197.44 |
| 46 | 10.3.197.45/32 | 10.3.197.45 – 10.3.197.45 | 10.3.197.45 |
| 47 | 10.3.197.46/32 | 10.3.197.46 – 10.3.197.46 | 10.3.197.46 |
| 48 | 10.3.197.47/32 | 10.3.197.47 – 10.3.197.47 | 10.3.197.47 |
| 49 | 10.3.197.48/32 | 10.3.197.48 – 10.3.197.48 | 10.3.197.48 |
| 50 | 10.3.197.49/32 | 10.3.197.49 – 10.3.197.49 | 10.3.197.49 |
| 51 | 10.3.197.50/32 | 10.3.197.50 – 10.3.197.50 | 10.3.197.50 |
| 52 | 10.3.197.51/32 | 10.3.197.51 – 10.3.197.51 | 10.3.197.51 |
| 53 | 10.3.197.52/32 | 10.3.197.52 – 10.3.197.52 | 10.3.197.52 |
| 54 | 10.3.197.53/32 | 10.3.197.53 – 10.3.197.53 | 10.3.197.53 |
| 55 | 10.3.197.54/32 | 10.3.197.54 – 10.3.197.54 | 10.3.197.54 |
| 56 | 10.3.197.55/32 | 10.3.197.55 – 10.3.197.55 | 10.3.197.55 |
| 57 | 10.3.197.56/32 | 10.3.197.56 – 10.3.197.56 | 10.3.197.56 |
| 58 | 10.3.197.57/32 | 10.3.197.57 – 10.3.197.57 | 10.3.197.57 |
| 59 | 10.3.197.58/32 | 10.3.197.58 – 10.3.197.58 | 10.3.197.58 |
| 60 | 10.3.197.59/32 | 10.3.197.59 – 10.3.197.59 | 10.3.197.59 |
| 61 | 10.3.197.60/32 | 10.3.197.60 – 10.3.197.60 | 10.3.197.60 |
| 62 | 10.3.197.61/32 | 10.3.197.61 – 10.3.197.61 | 10.3.197.61 |
| 63 | 10.3.197.62/32 | 10.3.197.62 – 10.3.197.62 | 10.3.197.62 |
| 64 | 10.3.197.63/32 | 10.3.197.63 – 10.3.197.63 | 10.3.197.63 |
| 65 | 10.3.197.64/32 | 10.3.197.64 – 10.3.197.64 | 10.3.197.64 |
| 66 | 10.3.197.65/32 | 10.3.197.65 – 10.3.197.65 | 10.3.197.65 |
| 67 | 10.3.197.66/32 | 10.3.197.66 – 10.3.197.66 | 10.3.197.66 |
| 68 | 10.3.197.67/32 | 10.3.197.67 – 10.3.197.67 | 10.3.197.67 |
| 69 | 10.3.197.68/32 | 10.3.197.68 – 10.3.197.68 | 10.3.197.68 |
| 70 | 10.3.197.69/32 | 10.3.197.69 – 10.3.197.69 | 10.3.197.69 |
| 71 | 10.3.197.70/32 | 10.3.197.70 – 10.3.197.70 | 10.3.197.70 |
| 72 | 10.3.197.71/32 | 10.3.197.71 – 10.3.197.71 | 10.3.197.71 |
| 73 | 10.3.197.72/32 | 10.3.197.72 – 10.3.197.72 | 10.3.197.72 |
| 74 | 10.3.197.73/32 | 10.3.197.73 – 10.3.197.73 | 10.3.197.73 |
| 75 | 10.3.197.74/32 | 10.3.197.74 – 10.3.197.74 | 10.3.197.74 |
| 76 | 10.3.197.75/32 | 10.3.197.75 – 10.3.197.75 | 10.3.197.75 |
| 77 | 10.3.197.76/32 | 10.3.197.76 – 10.3.197.76 | 10.3.197.76 |
| 78 | 10.3.197.77/32 | 10.3.197.77 – 10.3.197.77 | 10.3.197.77 |
| 79 | 10.3.197.78/32 | 10.3.197.78 – 10.3.197.78 | 10.3.197.78 |
| 80 | 10.3.197.79/32 | 10.3.197.79 – 10.3.197.79 | 10.3.197.79 |
| 81 | 10.3.197.80/32 | 10.3.197.80 – 10.3.197.80 | 10.3.197.80 |
| 82 | 10.3.197.81/32 | 10.3.197.81 – 10.3.197.81 | 10.3.197.81 |
| 83 | 10.3.197.82/32 | 10.3.197.82 – 10.3.197.82 | 10.3.197.82 |
| 84 | 10.3.197.83/32 | 10.3.197.83 – 10.3.197.83 | 10.3.197.83 |
| 85 | 10.3.197.84/32 | 10.3.197.84 – 10.3.197.84 | 10.3.197.84 |
| 86 | 10.3.197.85/32 | 10.3.197.85 – 10.3.197.85 | 10.3.197.85 |
| 87 | 10.3.197.86/32 | 10.3.197.86 – 10.3.197.86 | 10.3.197.86 |
| 88 | 10.3.197.87/32 | 10.3.197.87 – 10.3.197.87 | 10.3.197.87 |
| 89 | 10.3.197.88/32 | 10.3.197.88 – 10.3.197.88 | 10.3.197.88 |
| 90 | 10.3.197.89/32 | 10.3.197.89 – 10.3.197.89 | 10.3.197.89 |
| 91 | 10.3.197.90/32 | 10.3.197.90 – 10.3.197.90 | 10.3.197.90 |
| 92 | 10.3.197.91/32 | 10.3.197.91 – 10.3.197.91 | 10.3.197.91 |
| 93 | 10.3.197.92/32 | 10.3.197.92 – 10.3.197.92 | 10.3.197.92 |
| 94 | 10.3.197.93/32 | 10.3.197.93 – 10.3.197.93 | 10.3.197.93 |
| 95 | 10.3.197.94/32 | 10.3.197.94 – 10.3.197.94 | 10.3.197.94 |
| 96 | 10.3.197.95/32 | 10.3.197.95 – 10.3.197.95 | 10.3.197.95 |
| 97 | 10.3.197.96/32 | 10.3.197.96 – 10.3.197.96 | 10.3.197.96 |
| 98 | 10.3.197.97/32 | 10.3.197.97 – 10.3.197.97 | 10.3.197.97 |
| 99 | 10.3.197.98/32 | 10.3.197.98 – 10.3.197.98 | 10.3.197.98 |
| 100 | 10.3.197.99/32 | 10.3.197.99 – 10.3.197.99 | 10.3.197.99 |
| 101 | 10.3.197.100/32 | 10.3.197.100 – 10.3.197.100 | 10.3.197.100 |
| 102 | 10.3.197.101/32 | 10.3.197.101 – 10.3.197.101 | 10.3.197.101 |
| 103 | 10.3.197.102/32 | 10.3.197.102 – 10.3.197.102 | 10.3.197.102 |
| 104 | 10.3.197.103/32 | 10.3.197.103 – 10.3.197.103 | 10.3.197.103 |
| 105 | 10.3.197.104/32 | 10.3.197.104 – 10.3.197.104 | 10.3.197.104 |
| 106 | 10.3.197.105/32 | 10.3.197.105 – 10.3.197.105 | 10.3.197.105 |
| 107 | 10.3.197.106/32 | 10.3.197.106 – 10.3.197.106 | 10.3.197.106 |
| 108 | 10.3.197.107/32 | 10.3.197.107 – 10.3.197.107 | 10.3.197.107 |
| 109 | 10.3.197.108/32 | 10.3.197.108 – 10.3.197.108 | 10.3.197.108 |
| 110 | 10.3.197.109/32 | 10.3.197.109 – 10.3.197.109 | 10.3.197.109 |
| 111 | 10.3.197.110/32 | 10.3.197.110 – 10.3.197.110 | 10.3.197.110 |
| 112 | 10.3.197.111/32 | 10.3.197.111 – 10.3.197.111 | 10.3.197.111 |
| 113 | 10.3.197.112/32 | 10.3.197.112 – 10.3.197.112 | 10.3.197.112 |
| 114 | 10.3.197.113/32 | 10.3.197.113 – 10.3.197.113 | 10.3.197.113 |
| 115 | 10.3.197.114/32 | 10.3.197.114 – 10.3.197.114 | 10.3.197.114 |
| 116 | 10.3.197.115/32 | 10.3.197.115 – 10.3.197.115 | 10.3.197.115 |
| 117 | 10.3.197.116/32 | 10.3.197.116 – 10.3.197.116 | 10.3.197.116 |
| 118 | 10.3.197.117/32 | 10.3.197.117 – 10.3.197.117 | 10.3.197.117 |
| 119 | 10.3.197.118/32 | 10.3.197.118 – 10.3.197.118 | 10.3.197.118 |
| 120 | 10.3.197.119/32 | 10.3.197.119 – 10.3.197.119 | 10.3.197.119 |
| 121 | 10.3.197.120/32 | 10.3.197.120 – 10.3.197.120 | 10.3.197.120 |
| 122 | 10.3.197.121/32 | 10.3.197.121 – 10.3.197.121 | 10.3.197.121 |
| 123 | 10.3.197.122/32 | 10.3.197.122 – 10.3.197.122 | 10.3.197.122 |
| 124 | 10.3.197.123/32 | 10.3.197.123 – 10.3.197.123 | 10.3.197.123 |
| 125 | 10.3.197.124/32 | 10.3.197.124 – 10.3.197.124 | 10.3.197.124 |
| 126 | 10.3.197.125/32 | 10.3.197.125 – 10.3.197.125 | 10.3.197.125 |
| 127 | 10.3.197.126/32 | 10.3.197.126 – 10.3.197.126 | 10.3.197.126 |
| 128 | 10.3.197.127/32 | 10.3.197.127 – 10.3.197.127 | 10.3.197.127 |
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.