10.0.21.184/29
Private (RFC 1918) RFC 1918Class A — /29 prefix — 6 usable hosts
Network address — the base address of the block (10.0.21.184). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 10.0.21.191 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 | 10.0.21.184/29 |
| Network Address | 10.0.21.184 |
| Broadcast Address | 10.0.21.191 |
| Subnet Mask | 255.255.255.248 |
| Wildcard Mask | 0.0.0.7 |
| Prefix Length | /29 |
| IP Address Class | Class A |
| Total IP Addresses | 8 |
| Usable Host Addresses | 6 |
| First Usable IP | 10.0.21.185 |
| Last Usable IP | 10.0.21.190 |
| Network (Hex) | 0x0A0015B8 |
| Broadcast (Hex) | 0x0A0015BF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
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 |
|---|---|---|---|---|---|
| 10.0.21.184/30 | 10.0.21.184 | 10.0.21.187 | 10.0.21.185 | 10.0.21.186 | 2 |
| 10.0.21.188/30 | 10.0.21.188 | 10.0.21.191 | 10.0.21.189 | 10.0.21.190 | 2 |