Subnet Calculator
0
32
64
96
128
160
192
224
Network
Host
Broadcast
Public IP Information
IP Address Information
152.99.67.128
10011000011000110100001110000000
255.255.255.248
11111111111111111111111111111000
152.99.67.128
10011000011000110100001110000000
152.99.67.135
10011000011000110100001110000111
0.0.0.7
00000000000000000000000000000111
/29
Network Bits: 29 |Host Bits: 3
152.99.67.129
10011000011000110100001110000001
152.99.67.134
10011000011000110100001110000110
Network Information
8
6
152.99.67.129 – 152.99.67.134
Subnet Cheat Sheet
| CIDR | Subnet Mask | Wildcard Mask | Total IPs | Usable Hosts | Network Bits | Host Bits |
|---|---|---|---|---|---|---|
| /32 | 255.255.255.255 | 0.0.0.0 | 1 | 1 | 32 | 0 |
| /31 | 255.255.255.254 | 0.0.0.1 | 2 | 2 | 31 | 1 |
| /30 | 255.255.255.252 | 0.0.0.3 | 4 | 2 | 30 | 2 |
| /29 | 255.255.255.248 | 0.0.0.7 | 8 | 6 | 29 | 3 |
| /28 | 255.255.255.240 | 0.0.0.15 | 16 | 14 | 28 | 4 |
| /27 | 255.255.255.224 | 0.0.0.31 | 32 | 30 | 27 | 5 |
| /26 | 255.255.255.192 | 0.0.0.63 | 64 | 62 | 26 | 6 |
| /25 | 255.255.255.128 | 0.0.0.127 | 128 | 126 | 25 | 7 |
| /24 | 255.255.255.0 | 0.0.0.255 | 256 | 254 | 24 | 8 |
| /23 | 255.255.254.0 | 0.0.1.255 | 512 | 510 | 23 | 9 |
| /22 | 255.255.252.0 | 0.0.3.255 | 1,024 | 1,022 | 22 | 10 |
| /21 | 255.255.248.0 | 0.0.7.255 | 2,048 | 2,046 | 21 | 11 |
| /20 | 255.255.240.0 | 0.0.15.255 | 4,096 | 4,094 | 20 | 12 |
| /19 | 255.255.224.0 | 0.0.31.255 | 8,192 | 8,190 | 19 | 13 |
| /18 | 255.255.192.0 | 0.0.63.255 | 16,384 | 16,382 | 18 | 14 |
| /17 | 255.255.128.0 | 0.0.127.255 | 32,768 | 32,766 | 17 | 15 |
| /16 | 255.255.0.0 | 0.0.255.255 | 65,536 | 65,534 | 16 | 16 |
| /15 | 255.254.0.0 | 0.1.255.255 | 131,072 | 131,070 | 15 | 17 |
| /14 | 255.252.0.0 | 0.3.255.255 | 262,144 | 262,142 | 14 | 18 |
| /13 | 255.248.0.0 | 0.7.255.255 | 524,288 | 524,286 | 13 | 19 |
| /12 | 255.240.0.0 | 0.15.255.255 | 1,048,576 | 1,048,574 | 12 | 20 |
| /11 | 255.224.0.0 | 0.31.255.255 | 2,097,152 | 2,097,150 | 11 | 21 |
| /10 | 255.192.0.0 | 0.63.255.255 | 4,194,304 | 4,194,302 | 10 | 22 |
| /9 | 255.128.0.0 | 0.127.255.255 | 8,388,608 | 8,388,606 | 9 | 23 |
| /8 | 255.0.0.0 | 0.255.255.255 | 16,777,216 | 16,777,214 | 8 | 24 |
| /7 | 254.0.0.0 | 1.255.255.255 | 33,554,432 | 33,554,430 | 7 | 25 |
| /6 | 252.0.0.0 | 3.255.255.255 | 67,108,864 | 67,108,862 | 6 | 26 |
| /5 | 248.0.0.0 | 7.255.255.255 | 134,217,728 | 134,217,726 | 5 | 27 |
| /4 | 240.0.0.0 | 15.255.255.255 | 268,435,456 | 268,435,454 | 4 | 28 |
| /3 | 224.0.0.0 | 31.255.255.255 | 536,870,912 | 536,870,910 | 3 | 29 |
| /2 | 192.0.0.0 | 63.255.255.255 | 1,073,741,824 | 1,073,741,822 | 2 | 30 |
| /1 | 128.0.0.0 | 127.255.255.255 | 2,147,483,648 | 2,147,483,646 | 1 | 31 |
| /0 | 0.0.0.0 | 255.255.255.255 | 4,294,967,296 | 4,294,967,294 | 0 | 32 |
Quick Reference
Frequently Asked Questions
How to Use
Enter an IP address and CIDR prefix above to calculate subnet details including network address, broadcast address, subnet mask, and usable host range.
CIDR Notation
CIDR (Classless Inter-Domain Routing) replaced traditional classful networking. The prefix length (e.g., /24) specifies how many bits identify the network, with the remaining bits identifying hosts.
Common Subnet Sizes
/24 (254 hosts) is the most common LAN size. /16 (65,534 hosts) suits large campuses. /30 (2 hosts) is used for point-to-point links. /32 represents a single host.