51.239.81.144/29
PublicClass A — /29 prefix — 6 usable hosts
Network address — the base address of the block (51.239.81.144). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 51.239.81.151 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 | 51.239.81.144/29 |
| Network Address | 51.239.81.144 |
| Broadcast Address | 51.239.81.151 |
| 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 | 51.239.81.145 |
| Last Usable IP | 51.239.81.150 |
| Network (Hex) | 0x33EF5190 |
| Broadcast (Hex) | 0x33EF5197 |
| 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.
Split into Equal Subnets
Split 51.239.81.144/29 into 2 equal /30 subnets (2 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 51.239.81.144/30 | 51.239.81.144 | 51.239.81.145 | 51.239.81.146 | 51.239.81.147 | 2 |
| 2 | 51.239.81.148/30 | 51.239.81.148 | 51.239.81.149 | 51.239.81.150 | 51.239.81.151 | 2 |