64.0.0.0/4
PublicClass A — /4 prefix — 268,435,454 usable hosts
Network address — the base address of the block (64.0.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 79.255.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 268,435,454 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 240.0.0.0 is the dotted-decimal equivalent of /4. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 64.0.0.0/4 |
| Network Address | 64.0.0.0 |
| Broadcast Address | 79.255.255.255 |
| Subnet Mask | 240.0.0.0 |
| Wildcard Mask | 15.255.255.255 |
| Prefix Length | /4 |
| IP Address Class | Class A |
| Total IP Addresses | 268,435,456 |
| Usable Host Addresses | 268,435,454 |
| First Usable IP | 64.0.0.1 |
| Last Usable IP | 79.255.255.254 |
| Network (Hex) | 0x40000000 |
| Broadcast (Hex) | 0x4FFFFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 4 bits (1s in the mask) identify the network. The remaining 28 bits identify hosts within the network.
Split into Equal Subnets
Split 64.0.0.0/4 into 2 equal /5 subnets (134,217,726 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.0.0.0/5 | 64.0.0.0 | 64.0.0.1 | 71.255.255.254 | 71.255.255.255 | 134,217,726 |
| 2 | 72.0.0.0/5 | 72.0.0.0 | 72.0.0.1 | 79.255.255.254 | 79.255.255.255 | 134,217,726 |
Split 64.0.0.0/4 into 4 equal /6 subnets (67,108,862 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.0.0.0/6 | 64.0.0.0 | 64.0.0.1 | 67.255.255.254 | 67.255.255.255 | 67,108,862 |
| 2 | 68.0.0.0/6 | 68.0.0.0 | 68.0.0.1 | 71.255.255.254 | 71.255.255.255 | 67,108,862 |
| 3 | 72.0.0.0/6 | 72.0.0.0 | 72.0.0.1 | 75.255.255.254 | 75.255.255.255 | 67,108,862 |
| 4 | 76.0.0.0/6 | 76.0.0.0 | 76.0.0.1 | 79.255.255.254 | 79.255.255.255 | 67,108,862 |
Split 64.0.0.0/4 into 8 equal /7 subnets (33,554,430 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.0.0.0/7 | 64.0.0.0 | 64.0.0.1 | 65.255.255.254 | 65.255.255.255 | 33,554,430 |
| 2 | 66.0.0.0/7 | 66.0.0.0 | 66.0.0.1 | 67.255.255.254 | 67.255.255.255 | 33,554,430 |
| 3 | 68.0.0.0/7 | 68.0.0.0 | 68.0.0.1 | 69.255.255.254 | 69.255.255.255 | 33,554,430 |
| 4 | 70.0.0.0/7 | 70.0.0.0 | 70.0.0.1 | 71.255.255.254 | 71.255.255.255 | 33,554,430 |
| 5 | 72.0.0.0/7 | 72.0.0.0 | 72.0.0.1 | 73.255.255.254 | 73.255.255.255 | 33,554,430 |
| 6 | 74.0.0.0/7 | 74.0.0.0 | 74.0.0.1 | 75.255.255.254 | 75.255.255.255 | 33,554,430 |
| 7 | 76.0.0.0/7 | 76.0.0.0 | 76.0.0.1 | 77.255.255.254 | 77.255.255.255 | 33,554,430 |
| 8 | 78.0.0.0/7 | 78.0.0.0 | 78.0.0.1 | 79.255.255.254 | 79.255.255.255 | 33,554,430 |
Split 64.0.0.0/4 into 16 equal /8 subnets (16,777,214 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.0.0.0/8 | 64.0.0.0 | 64.0.0.1 | 64.255.255.254 | 64.255.255.255 | 16,777,214 |
| 2 | 65.0.0.0/8 | 65.0.0.0 | 65.0.0.1 | 65.255.255.254 | 65.255.255.255 | 16,777,214 |
| 3 | 66.0.0.0/8 | 66.0.0.0 | 66.0.0.1 | 66.255.255.254 | 66.255.255.255 | 16,777,214 |
| 4 | 67.0.0.0/8 | 67.0.0.0 | 67.0.0.1 | 67.255.255.254 | 67.255.255.255 | 16,777,214 |
| 5 | 68.0.0.0/8 | 68.0.0.0 | 68.0.0.1 | 68.255.255.254 | 68.255.255.255 | 16,777,214 |
| 6 | 69.0.0.0/8 | 69.0.0.0 | 69.0.0.1 | 69.255.255.254 | 69.255.255.255 | 16,777,214 |
| 7 | 70.0.0.0/8 | 70.0.0.0 | 70.0.0.1 | 70.255.255.254 | 70.255.255.255 | 16,777,214 |
| 8 | 71.0.0.0/8 | 71.0.0.0 | 71.0.0.1 | 71.255.255.254 | 71.255.255.255 | 16,777,214 |
| 9 | 72.0.0.0/8 | 72.0.0.0 | 72.0.0.1 | 72.255.255.254 | 72.255.255.255 | 16,777,214 |
| 10 | 73.0.0.0/8 | 73.0.0.0 | 73.0.0.1 | 73.255.255.254 | 73.255.255.255 | 16,777,214 |
| 11 | 74.0.0.0/8 | 74.0.0.0 | 74.0.0.1 | 74.255.255.254 | 74.255.255.255 | 16,777,214 |
| 12 | 75.0.0.0/8 | 75.0.0.0 | 75.0.0.1 | 75.255.255.254 | 75.255.255.255 | 16,777,214 |
| 13 | 76.0.0.0/8 | 76.0.0.0 | 76.0.0.1 | 76.255.255.254 | 76.255.255.255 | 16,777,214 |
| 14 | 77.0.0.0/8 | 77.0.0.0 | 77.0.0.1 | 77.255.255.254 | 77.255.255.255 | 16,777,214 |
| 15 | 78.0.0.0/8 | 78.0.0.0 | 78.0.0.1 | 78.255.255.254 | 78.255.255.255 | 16,777,214 |
| 16 | 79.0.0.0/8 | 79.0.0.0 | 79.0.0.1 | 79.255.255.254 | 79.255.255.255 | 16,777,214 |