192.0.2.40/29
Public RFC 5737Class C — /29 prefix — 6 usable hosts
Network address — the base address of the block (192.0.2.40). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 192.0.2.47 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 6 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.248 is the dotted-decimal equivalent of /29. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 192.0.2.40/29 |
| Network Address | 192.0.2.40 |
| Broadcast Address | 192.0.2.47 |
| Subnet Mask | 255.255.255.248 |
| Wildcard Mask | 0.0.0.7 |
| Prefix Length | /29 |
| IP Address Class | Class C |
| Total IP Addresses | 8 |
| Usable Host Addresses | 6 |
| First Usable IP | 192.0.2.41 |
| Last Usable IP | 192.0.2.46 |
| Network (Hex) | 0xC0000228 |
| Broadcast (Hex) | 0xC000022F |
| Governing RFC | RFC 5737 |
| Address Type | Public / Globally Routable |
Binary Representation
The first 29 bits (1s in the mask) identify the network. The remaining 3 bits identify hosts within the network.
Subnet Breakdown — splitting into /30
This /29 block can be divided into 2 /30 subnets.
| CIDR | Network | Broadcast | First Usable | Last Usable | Hosts |
|---|---|---|---|---|---|
| 192.0.2.40/30 | 192.0.2.40 | 192.0.2.43 | 192.0.2.41 | 192.0.2.42 | 2 |
| 192.0.2.44/30 | 192.0.2.44 | 192.0.2.47 | 192.0.2.45 | 192.0.2.46 | 2 |