240.0.0.0/5
PublicClass E (Reserved) — /5 prefix — 134,217,726 usable hosts
Network address — the base address of the block (240.0.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 247.255.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 134,217,726 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 248.0.0.0 is the dotted-decimal equivalent of /5. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 240.0.0.0/5 |
| Network Address | 240.0.0.0 |
| Broadcast Address | 247.255.255.255 |
| Subnet Mask | 248.0.0.0 |
| Wildcard Mask | 7.255.255.255 |
| Prefix Length | /5 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 134,217,728 |
| Usable Host Addresses | 134,217,726 |
| First Usable IP | 240.0.0.1 |
| Last Usable IP | 247.255.255.254 |
| Network (Hex) | 0xF0000000 |
| Broadcast (Hex) | 0xF7FFFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 5 bits (1s in the mask) identify the network. The remaining 27 bits identify hosts within the network.
Subnet Breakdown — splitting into /6
This /5 block can be divided into 2 /6 subnets.
| CIDR | Network | Broadcast | First Usable | Last Usable | Hosts |
|---|---|---|---|---|---|
| 240.0.0.0/6 | 240.0.0.0 | 243.255.255.255 | 240.0.0.1 | 243.255.255.254 | 67,108,862 |
| 244.0.0.0/6 | 244.0.0.0 | 247.255.255.255 | 244.0.0.1 | 247.255.255.254 | 67,108,862 |