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)172.16.8.192/27
network172.16.8.192/27
broadcast172.16.8.223
first host172.16.8.193
last host172.16.8.222
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classB
ipcalc 172.16.8.192/27
address10101100.00010000.00001000.11000000
subnet mask11111111.11111111.11111111.11100000
network10101100.00010000.00001000.11000000
broadcast10101100.00010000.00001000.11011111
green = network part, grey = host part
hex0xac1008c0
decimal2886731968
reverse dns192.8.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:8c0
/27 split into /32 · 32 subnets
close ×| # | network | host range | broadcast |
|---|---|---|---|
| 1 | 172.16.8.192/32 | 172.16.8.192 – 172.16.8.192 | 172.16.8.192 |
| 2 | 172.16.8.193/32 | 172.16.8.193 – 172.16.8.193 | 172.16.8.193 |
| 3 | 172.16.8.194/32 | 172.16.8.194 – 172.16.8.194 | 172.16.8.194 |
| 4 | 172.16.8.195/32 | 172.16.8.195 – 172.16.8.195 | 172.16.8.195 |
| 5 | 172.16.8.196/32 | 172.16.8.196 – 172.16.8.196 | 172.16.8.196 |
| 6 | 172.16.8.197/32 | 172.16.8.197 – 172.16.8.197 | 172.16.8.197 |
| 7 | 172.16.8.198/32 | 172.16.8.198 – 172.16.8.198 | 172.16.8.198 |
| 8 | 172.16.8.199/32 | 172.16.8.199 – 172.16.8.199 | 172.16.8.199 |
| 9 | 172.16.8.200/32 | 172.16.8.200 – 172.16.8.200 | 172.16.8.200 |
| 10 | 172.16.8.201/32 | 172.16.8.201 – 172.16.8.201 | 172.16.8.201 |
| 11 | 172.16.8.202/32 | 172.16.8.202 – 172.16.8.202 | 172.16.8.202 |
| 12 | 172.16.8.203/32 | 172.16.8.203 – 172.16.8.203 | 172.16.8.203 |
| 13 | 172.16.8.204/32 | 172.16.8.204 – 172.16.8.204 | 172.16.8.204 |
| 14 | 172.16.8.205/32 | 172.16.8.205 – 172.16.8.205 | 172.16.8.205 |
| 15 | 172.16.8.206/32 | 172.16.8.206 – 172.16.8.206 | 172.16.8.206 |
| 16 | 172.16.8.207/32 | 172.16.8.207 – 172.16.8.207 | 172.16.8.207 |
| 17 | 172.16.8.208/32 | 172.16.8.208 – 172.16.8.208 | 172.16.8.208 |
| 18 | 172.16.8.209/32 | 172.16.8.209 – 172.16.8.209 | 172.16.8.209 |
| 19 | 172.16.8.210/32 | 172.16.8.210 – 172.16.8.210 | 172.16.8.210 |
| 20 | 172.16.8.211/32 | 172.16.8.211 – 172.16.8.211 | 172.16.8.211 |
| 21 | 172.16.8.212/32 | 172.16.8.212 – 172.16.8.212 | 172.16.8.212 |
| 22 | 172.16.8.213/32 | 172.16.8.213 – 172.16.8.213 | 172.16.8.213 |
| 23 | 172.16.8.214/32 | 172.16.8.214 – 172.16.8.214 | 172.16.8.214 |
| 24 | 172.16.8.215/32 | 172.16.8.215 – 172.16.8.215 | 172.16.8.215 |
| 25 | 172.16.8.216/32 | 172.16.8.216 – 172.16.8.216 | 172.16.8.216 |
| 26 | 172.16.8.217/32 | 172.16.8.217 – 172.16.8.217 | 172.16.8.217 |
| 27 | 172.16.8.218/32 | 172.16.8.218 – 172.16.8.218 | 172.16.8.218 |
| 28 | 172.16.8.219/32 | 172.16.8.219 – 172.16.8.219 | 172.16.8.219 |
| 29 | 172.16.8.220/32 | 172.16.8.220 – 172.16.8.220 | 172.16.8.220 |
| 30 | 172.16.8.221/32 | 172.16.8.221 – 172.16.8.221 | 172.16.8.221 |
| 31 | 172.16.8.222/32 | 172.16.8.222 – 172.16.8.222 | 172.16.8.222 |
| 32 | 172.16.8.223/32 | 172.16.8.223 – 172.16.8.223 | 172.16.8.223 |
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 /27 |
|---|---|---|---|---|
| /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 | - |
| /26 | 255.255.255.192 | 64 | 62 | - |
| /27 | 255.255.255.224 | 32 | 30 | 1 |
| /28 | 255.255.255.240 | 16 | 14 | 2 split → |
| /29 | 255.255.255.248 | 8 | 6 | 4 split → |
| /30 | 255.255.255.252 | 4 | 2 | 8 split → |
| /31 | 255.255.255.254 | 2 | 2 | 16 split → |
| /32 | 255.255.255.255 | 1 | 1 | 32 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.