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)10.87.0.0/25
network10.87.0.0/25
broadcast10.87.0.127
first host10.87.0.1
last host10.87.0.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.87.0.0/25
address00001010.01010111.00000000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01010111.00000000.00000000
broadcast00001010.01010111.00000000.01111111
green = network part, grey = host part
hex0x0a570000
decimal173473792
reverse dns0.0.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:0
/25 split into /32 · 128 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 10.87.0.0/32 | 10.87.0.0 – 10.87.0.0 | 10.87.0.0 |
| 2 | 10.87.0.1/32 | 10.87.0.1 – 10.87.0.1 | 10.87.0.1 |
| 3 | 10.87.0.2/32 | 10.87.0.2 – 10.87.0.2 | 10.87.0.2 |
| 4 | 10.87.0.3/32 | 10.87.0.3 – 10.87.0.3 | 10.87.0.3 |
| 5 | 10.87.0.4/32 | 10.87.0.4 – 10.87.0.4 | 10.87.0.4 |
| 6 | 10.87.0.5/32 | 10.87.0.5 – 10.87.0.5 | 10.87.0.5 |
| 7 | 10.87.0.6/32 | 10.87.0.6 – 10.87.0.6 | 10.87.0.6 |
| 8 | 10.87.0.7/32 | 10.87.0.7 – 10.87.0.7 | 10.87.0.7 |
| 9 | 10.87.0.8/32 | 10.87.0.8 – 10.87.0.8 | 10.87.0.8 |
| 10 | 10.87.0.9/32 | 10.87.0.9 – 10.87.0.9 | 10.87.0.9 |
| 11 | 10.87.0.10/32 | 10.87.0.10 – 10.87.0.10 | 10.87.0.10 |
| 12 | 10.87.0.11/32 | 10.87.0.11 – 10.87.0.11 | 10.87.0.11 |
| 13 | 10.87.0.12/32 | 10.87.0.12 – 10.87.0.12 | 10.87.0.12 |
| 14 | 10.87.0.13/32 | 10.87.0.13 – 10.87.0.13 | 10.87.0.13 |
| 15 | 10.87.0.14/32 | 10.87.0.14 – 10.87.0.14 | 10.87.0.14 |
| 16 | 10.87.0.15/32 | 10.87.0.15 – 10.87.0.15 | 10.87.0.15 |
| 17 | 10.87.0.16/32 | 10.87.0.16 – 10.87.0.16 | 10.87.0.16 |
| 18 | 10.87.0.17/32 | 10.87.0.17 – 10.87.0.17 | 10.87.0.17 |
| 19 | 10.87.0.18/32 | 10.87.0.18 – 10.87.0.18 | 10.87.0.18 |
| 20 | 10.87.0.19/32 | 10.87.0.19 – 10.87.0.19 | 10.87.0.19 |
| 21 | 10.87.0.20/32 | 10.87.0.20 – 10.87.0.20 | 10.87.0.20 |
| 22 | 10.87.0.21/32 | 10.87.0.21 – 10.87.0.21 | 10.87.0.21 |
| 23 | 10.87.0.22/32 | 10.87.0.22 – 10.87.0.22 | 10.87.0.22 |
| 24 | 10.87.0.23/32 | 10.87.0.23 – 10.87.0.23 | 10.87.0.23 |
| 25 | 10.87.0.24/32 | 10.87.0.24 – 10.87.0.24 | 10.87.0.24 |
| 26 | 10.87.0.25/32 | 10.87.0.25 – 10.87.0.25 | 10.87.0.25 |
| 27 | 10.87.0.26/32 | 10.87.0.26 – 10.87.0.26 | 10.87.0.26 |
| 28 | 10.87.0.27/32 | 10.87.0.27 – 10.87.0.27 | 10.87.0.27 |
| 29 | 10.87.0.28/32 | 10.87.0.28 – 10.87.0.28 | 10.87.0.28 |
| 30 | 10.87.0.29/32 | 10.87.0.29 – 10.87.0.29 | 10.87.0.29 |
| 31 | 10.87.0.30/32 | 10.87.0.30 – 10.87.0.30 | 10.87.0.30 |
| 32 | 10.87.0.31/32 | 10.87.0.31 – 10.87.0.31 | 10.87.0.31 |
| 33 | 10.87.0.32/32 | 10.87.0.32 – 10.87.0.32 | 10.87.0.32 |
| 34 | 10.87.0.33/32 | 10.87.0.33 – 10.87.0.33 | 10.87.0.33 |
| 35 | 10.87.0.34/32 | 10.87.0.34 – 10.87.0.34 | 10.87.0.34 |
| 36 | 10.87.0.35/32 | 10.87.0.35 – 10.87.0.35 | 10.87.0.35 |
| 37 | 10.87.0.36/32 | 10.87.0.36 – 10.87.0.36 | 10.87.0.36 |
| 38 | 10.87.0.37/32 | 10.87.0.37 – 10.87.0.37 | 10.87.0.37 |
| 39 | 10.87.0.38/32 | 10.87.0.38 – 10.87.0.38 | 10.87.0.38 |
| 40 | 10.87.0.39/32 | 10.87.0.39 – 10.87.0.39 | 10.87.0.39 |
| 41 | 10.87.0.40/32 | 10.87.0.40 – 10.87.0.40 | 10.87.0.40 |
| 42 | 10.87.0.41/32 | 10.87.0.41 – 10.87.0.41 | 10.87.0.41 |
| 43 | 10.87.0.42/32 | 10.87.0.42 – 10.87.0.42 | 10.87.0.42 |
| 44 | 10.87.0.43/32 | 10.87.0.43 – 10.87.0.43 | 10.87.0.43 |
| 45 | 10.87.0.44/32 | 10.87.0.44 – 10.87.0.44 | 10.87.0.44 |
| 46 | 10.87.0.45/32 | 10.87.0.45 – 10.87.0.45 | 10.87.0.45 |
| 47 | 10.87.0.46/32 | 10.87.0.46 – 10.87.0.46 | 10.87.0.46 |
| 48 | 10.87.0.47/32 | 10.87.0.47 – 10.87.0.47 | 10.87.0.47 |
| 49 | 10.87.0.48/32 | 10.87.0.48 – 10.87.0.48 | 10.87.0.48 |
| 50 | 10.87.0.49/32 | 10.87.0.49 – 10.87.0.49 | 10.87.0.49 |
| 51 | 10.87.0.50/32 | 10.87.0.50 – 10.87.0.50 | 10.87.0.50 |
| 52 | 10.87.0.51/32 | 10.87.0.51 – 10.87.0.51 | 10.87.0.51 |
| 53 | 10.87.0.52/32 | 10.87.0.52 – 10.87.0.52 | 10.87.0.52 |
| 54 | 10.87.0.53/32 | 10.87.0.53 – 10.87.0.53 | 10.87.0.53 |
| 55 | 10.87.0.54/32 | 10.87.0.54 – 10.87.0.54 | 10.87.0.54 |
| 56 | 10.87.0.55/32 | 10.87.0.55 – 10.87.0.55 | 10.87.0.55 |
| 57 | 10.87.0.56/32 | 10.87.0.56 – 10.87.0.56 | 10.87.0.56 |
| 58 | 10.87.0.57/32 | 10.87.0.57 – 10.87.0.57 | 10.87.0.57 |
| 59 | 10.87.0.58/32 | 10.87.0.58 – 10.87.0.58 | 10.87.0.58 |
| 60 | 10.87.0.59/32 | 10.87.0.59 – 10.87.0.59 | 10.87.0.59 |
| 61 | 10.87.0.60/32 | 10.87.0.60 – 10.87.0.60 | 10.87.0.60 |
| 62 | 10.87.0.61/32 | 10.87.0.61 – 10.87.0.61 | 10.87.0.61 |
| 63 | 10.87.0.62/32 | 10.87.0.62 – 10.87.0.62 | 10.87.0.62 |
| 64 | 10.87.0.63/32 | 10.87.0.63 – 10.87.0.63 | 10.87.0.63 |
| 65 | 10.87.0.64/32 | 10.87.0.64 – 10.87.0.64 | 10.87.0.64 |
| 66 | 10.87.0.65/32 | 10.87.0.65 – 10.87.0.65 | 10.87.0.65 |
| 67 | 10.87.0.66/32 | 10.87.0.66 – 10.87.0.66 | 10.87.0.66 |
| 68 | 10.87.0.67/32 | 10.87.0.67 – 10.87.0.67 | 10.87.0.67 |
| 69 | 10.87.0.68/32 | 10.87.0.68 – 10.87.0.68 | 10.87.0.68 |
| 70 | 10.87.0.69/32 | 10.87.0.69 – 10.87.0.69 | 10.87.0.69 |
| 71 | 10.87.0.70/32 | 10.87.0.70 – 10.87.0.70 | 10.87.0.70 |
| 72 | 10.87.0.71/32 | 10.87.0.71 – 10.87.0.71 | 10.87.0.71 |
| 73 | 10.87.0.72/32 | 10.87.0.72 – 10.87.0.72 | 10.87.0.72 |
| 74 | 10.87.0.73/32 | 10.87.0.73 – 10.87.0.73 | 10.87.0.73 |
| 75 | 10.87.0.74/32 | 10.87.0.74 – 10.87.0.74 | 10.87.0.74 |
| 76 | 10.87.0.75/32 | 10.87.0.75 – 10.87.0.75 | 10.87.0.75 |
| 77 | 10.87.0.76/32 | 10.87.0.76 – 10.87.0.76 | 10.87.0.76 |
| 78 | 10.87.0.77/32 | 10.87.0.77 – 10.87.0.77 | 10.87.0.77 |
| 79 | 10.87.0.78/32 | 10.87.0.78 – 10.87.0.78 | 10.87.0.78 |
| 80 | 10.87.0.79/32 | 10.87.0.79 – 10.87.0.79 | 10.87.0.79 |
| 81 | 10.87.0.80/32 | 10.87.0.80 – 10.87.0.80 | 10.87.0.80 |
| 82 | 10.87.0.81/32 | 10.87.0.81 – 10.87.0.81 | 10.87.0.81 |
| 83 | 10.87.0.82/32 | 10.87.0.82 – 10.87.0.82 | 10.87.0.82 |
| 84 | 10.87.0.83/32 | 10.87.0.83 – 10.87.0.83 | 10.87.0.83 |
| 85 | 10.87.0.84/32 | 10.87.0.84 – 10.87.0.84 | 10.87.0.84 |
| 86 | 10.87.0.85/32 | 10.87.0.85 – 10.87.0.85 | 10.87.0.85 |
| 87 | 10.87.0.86/32 | 10.87.0.86 – 10.87.0.86 | 10.87.0.86 |
| 88 | 10.87.0.87/32 | 10.87.0.87 – 10.87.0.87 | 10.87.0.87 |
| 89 | 10.87.0.88/32 | 10.87.0.88 – 10.87.0.88 | 10.87.0.88 |
| 90 | 10.87.0.89/32 | 10.87.0.89 – 10.87.0.89 | 10.87.0.89 |
| 91 | 10.87.0.90/32 | 10.87.0.90 – 10.87.0.90 | 10.87.0.90 |
| 92 | 10.87.0.91/32 | 10.87.0.91 – 10.87.0.91 | 10.87.0.91 |
| 93 | 10.87.0.92/32 | 10.87.0.92 – 10.87.0.92 | 10.87.0.92 |
| 94 | 10.87.0.93/32 | 10.87.0.93 – 10.87.0.93 | 10.87.0.93 |
| 95 | 10.87.0.94/32 | 10.87.0.94 – 10.87.0.94 | 10.87.0.94 |
| 96 | 10.87.0.95/32 | 10.87.0.95 – 10.87.0.95 | 10.87.0.95 |
| 97 | 10.87.0.96/32 | 10.87.0.96 – 10.87.0.96 | 10.87.0.96 |
| 98 | 10.87.0.97/32 | 10.87.0.97 – 10.87.0.97 | 10.87.0.97 |
| 99 | 10.87.0.98/32 | 10.87.0.98 – 10.87.0.98 | 10.87.0.98 |
| 100 | 10.87.0.99/32 | 10.87.0.99 – 10.87.0.99 | 10.87.0.99 |
| 101 | 10.87.0.100/32 | 10.87.0.100 – 10.87.0.100 | 10.87.0.100 |
| 102 | 10.87.0.101/32 | 10.87.0.101 – 10.87.0.101 | 10.87.0.101 |
| 103 | 10.87.0.102/32 | 10.87.0.102 – 10.87.0.102 | 10.87.0.102 |
| 104 | 10.87.0.103/32 | 10.87.0.103 – 10.87.0.103 | 10.87.0.103 |
| 105 | 10.87.0.104/32 | 10.87.0.104 – 10.87.0.104 | 10.87.0.104 |
| 106 | 10.87.0.105/32 | 10.87.0.105 – 10.87.0.105 | 10.87.0.105 |
| 107 | 10.87.0.106/32 | 10.87.0.106 – 10.87.0.106 | 10.87.0.106 |
| 108 | 10.87.0.107/32 | 10.87.0.107 – 10.87.0.107 | 10.87.0.107 |
| 109 | 10.87.0.108/32 | 10.87.0.108 – 10.87.0.108 | 10.87.0.108 |
| 110 | 10.87.0.109/32 | 10.87.0.109 – 10.87.0.109 | 10.87.0.109 |
| 111 | 10.87.0.110/32 | 10.87.0.110 – 10.87.0.110 | 10.87.0.110 |
| 112 | 10.87.0.111/32 | 10.87.0.111 – 10.87.0.111 | 10.87.0.111 |
| 113 | 10.87.0.112/32 | 10.87.0.112 – 10.87.0.112 | 10.87.0.112 |
| 114 | 10.87.0.113/32 | 10.87.0.113 – 10.87.0.113 | 10.87.0.113 |
| 115 | 10.87.0.114/32 | 10.87.0.114 – 10.87.0.114 | 10.87.0.114 |
| 116 | 10.87.0.115/32 | 10.87.0.115 – 10.87.0.115 | 10.87.0.115 |
| 117 | 10.87.0.116/32 | 10.87.0.116 – 10.87.0.116 | 10.87.0.116 |
| 118 | 10.87.0.117/32 | 10.87.0.117 – 10.87.0.117 | 10.87.0.117 |
| 119 | 10.87.0.118/32 | 10.87.0.118 – 10.87.0.118 | 10.87.0.118 |
| 120 | 10.87.0.119/32 | 10.87.0.119 – 10.87.0.119 | 10.87.0.119 |
| 121 | 10.87.0.120/32 | 10.87.0.120 – 10.87.0.120 | 10.87.0.120 |
| 122 | 10.87.0.121/32 | 10.87.0.121 – 10.87.0.121 | 10.87.0.121 |
| 123 | 10.87.0.122/32 | 10.87.0.122 – 10.87.0.122 | 10.87.0.122 |
| 124 | 10.87.0.123/32 | 10.87.0.123 – 10.87.0.123 | 10.87.0.123 |
| 125 | 10.87.0.124/32 | 10.87.0.124 – 10.87.0.124 | 10.87.0.124 |
| 126 | 10.87.0.125/32 | 10.87.0.125 – 10.87.0.125 | 10.87.0.125 |
| 127 | 10.87.0.126/32 | 10.87.0.126 – 10.87.0.126 | 10.87.0.126 |
| 128 | 10.87.0.127/32 | 10.87.0.127 – 10.87.0.127 | 10.87.0.127 |
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.