/4 Subnet
268,435,456 total IPs — 268,435,454 usable hosts.
Example /4 Networks
| CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|
| 0.0.0.0/4 | 0.0.0.0 | 0.0.0.1 | 15.255.255.254 | 15.255.255.255 | 268,435,454 |
| 160.0.0.0/4 | 160.0.0.0 | 160.0.0.1 | 175.255.255.254 | 175.255.255.255 | 268,435,454 |
| 160.0.0.0/4 | 160.0.0.0 | 160.0.0.1 | 175.255.255.254 | 175.255.255.255 | 268,435,454 |
| 192.0.0.0/4 | 192.0.0.0 | 192.0.0.1 | 207.255.255.254 | 207.255.255.255 | 268,435,454 |
| 192.0.0.0/4 | 192.0.0.0 | 192.0.0.1 | 207.255.255.254 | 207.255.255.255 | 268,435,454 |
| 0.0.0.0/4 | 0.0.0.0 | 0.0.0.1 | 15.255.255.254 | 15.255.255.255 | 268,435,454 |
How /4 Compares
| Prefix | Total IPs | Usable Hosts | Subnet Mask | Typical Use |
|---|---|---|---|---|
| /1 | 2,147,483,648 | 2,147,483,646 | 128.0.0.0 | — |
| /2 | 1,073,741,824 | 1,073,741,822 | 192.0.0.0 | — |
| /3 | 536,870,912 | 536,870,910 | 224.0.0.0 | — |
| /4 ◀ | 268,435,456 | 268,435,454 | 240.0.0.0 | — |
| /5 | 134,217,728 | 134,217,726 | 248.0.0.0 | — |
| /6 | 67,108,864 | 67,108,862 | 252.0.0.0 | — |
| /7 | 33,554,432 | 33,554,430 | 254.0.0.0 | — |
Frequently Asked Questions
How many IPs are in a /4?
A /4 subnet contains 268,435,456 total IP addresses and 268,435,454 usable host addresses. The network address (first IP) and broadcast address (last IP) are reserved and cannot be assigned to hosts.
What is the subnet mask for /4?
The subnet mask for a /4 is 240.0.0.0.
In CIDR notation, the prefix length /4 means
the first 4 bits of the address are the network portion.
The wildcard (inverse) mask is 15.255.255.255.
How many /4 subnets fit in a /3?
Exactly 2 — a /3 can be split into two /4 subnets of equal size.