65.0.0.0/9
PublicClass A — /9 prefix — 8,388,606 usable hosts
Network address — the base address of the block (65.0.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 65.127.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 8,388,606 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.128.0.0 is the dotted-decimal equivalent of /9. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 65.0.0.0/9 |
| Network Address | 65.0.0.0 |
| Broadcast Address | 65.127.255.255 |
| Subnet Mask | 255.128.0.0 |
| Wildcard Mask | 0.127.255.255 |
| Prefix Length | /9 |
| IP Address Class | Class A |
| Total IP Addresses | 8,388,608 |
| Usable Host Addresses | 8,388,606 |
| First Usable IP | 65.0.0.1 |
| Last Usable IP | 65.127.255.254 |
| Network (Hex) | 0x41000000 |
| Broadcast (Hex) | 0x417FFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 9 bits (1s in the mask) identify the network. The remaining 23 bits identify hosts within the network.
Split into Equal Subnets
Split 65.0.0.0/9 into 2 equal /10 subnets (4,194,302 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.0.0.0/10 | 65.0.0.0 | 65.0.0.1 | 65.63.255.254 | 65.63.255.255 | 4,194,302 |
| 2 | 65.64.0.0/10 | 65.64.0.0 | 65.64.0.1 | 65.127.255.254 | 65.127.255.255 | 4,194,302 |
Split 65.0.0.0/9 into 4 equal /11 subnets (2,097,150 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.0.0.0/11 | 65.0.0.0 | 65.0.0.1 | 65.31.255.254 | 65.31.255.255 | 2,097,150 |
| 2 | 65.32.0.0/11 | 65.32.0.0 | 65.32.0.1 | 65.63.255.254 | 65.63.255.255 | 2,097,150 |
| 3 | 65.64.0.0/11 | 65.64.0.0 | 65.64.0.1 | 65.95.255.254 | 65.95.255.255 | 2,097,150 |
| 4 | 65.96.0.0/11 | 65.96.0.0 | 65.96.0.1 | 65.127.255.254 | 65.127.255.255 | 2,097,150 |
Split 65.0.0.0/9 into 8 equal /12 subnets (1,048,574 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.0.0.0/12 | 65.0.0.0 | 65.0.0.1 | 65.15.255.254 | 65.15.255.255 | 1,048,574 |
| 2 | 65.16.0.0/12 | 65.16.0.0 | 65.16.0.1 | 65.31.255.254 | 65.31.255.255 | 1,048,574 |
| 3 | 65.32.0.0/12 | 65.32.0.0 | 65.32.0.1 | 65.47.255.254 | 65.47.255.255 | 1,048,574 |
| 4 | 65.48.0.0/12 | 65.48.0.0 | 65.48.0.1 | 65.63.255.254 | 65.63.255.255 | 1,048,574 |
| 5 | 65.64.0.0/12 | 65.64.0.0 | 65.64.0.1 | 65.79.255.254 | 65.79.255.255 | 1,048,574 |
| 6 | 65.80.0.0/12 | 65.80.0.0 | 65.80.0.1 | 65.95.255.254 | 65.95.255.255 | 1,048,574 |
| 7 | 65.96.0.0/12 | 65.96.0.0 | 65.96.0.1 | 65.111.255.254 | 65.111.255.255 | 1,048,574 |
| 8 | 65.112.0.0/12 | 65.112.0.0 | 65.112.0.1 | 65.127.255.254 | 65.127.255.255 | 1,048,574 |
Split 65.0.0.0/9 into 16 equal /13 subnets (524,286 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.0.0.0/13 | 65.0.0.0 | 65.0.0.1 | 65.7.255.254 | 65.7.255.255 | 524,286 |
| 2 | 65.8.0.0/13 | 65.8.0.0 | 65.8.0.1 | 65.15.255.254 | 65.15.255.255 | 524,286 |
| 3 | 65.16.0.0/13 | 65.16.0.0 | 65.16.0.1 | 65.23.255.254 | 65.23.255.255 | 524,286 |
| 4 | 65.24.0.0/13 | 65.24.0.0 | 65.24.0.1 | 65.31.255.254 | 65.31.255.255 | 524,286 |
| 5 | 65.32.0.0/13 | 65.32.0.0 | 65.32.0.1 | 65.39.255.254 | 65.39.255.255 | 524,286 |
| 6 | 65.40.0.0/13 | 65.40.0.0 | 65.40.0.1 | 65.47.255.254 | 65.47.255.255 | 524,286 |
| 7 | 65.48.0.0/13 | 65.48.0.0 | 65.48.0.1 | 65.55.255.254 | 65.55.255.255 | 524,286 |
| 8 | 65.56.0.0/13 | 65.56.0.0 | 65.56.0.1 | 65.63.255.254 | 65.63.255.255 | 524,286 |
| 9 | 65.64.0.0/13 | 65.64.0.0 | 65.64.0.1 | 65.71.255.254 | 65.71.255.255 | 524,286 |
| 10 | 65.72.0.0/13 | 65.72.0.0 | 65.72.0.1 | 65.79.255.254 | 65.79.255.255 | 524,286 |
| 11 | 65.80.0.0/13 | 65.80.0.0 | 65.80.0.1 | 65.87.255.254 | 65.87.255.255 | 524,286 |
| 12 | 65.88.0.0/13 | 65.88.0.0 | 65.88.0.1 | 65.95.255.254 | 65.95.255.255 | 524,286 |
| 13 | 65.96.0.0/13 | 65.96.0.0 | 65.96.0.1 | 65.103.255.254 | 65.103.255.255 | 524,286 |
| 14 | 65.104.0.0/13 | 65.104.0.0 | 65.104.0.1 | 65.111.255.254 | 65.111.255.255 | 524,286 |
| 15 | 65.112.0.0/13 | 65.112.0.0 | 65.112.0.1 | 65.119.255.254 | 65.119.255.255 | 524,286 |
| 16 | 65.120.0.0/13 | 65.120.0.0 | 65.120.0.1 | 65.127.255.254 | 65.127.255.255 | 524,286 |