255.40.0.0/13
PublicClass E (Reserved) — /13 prefix — 524,286 usable hosts
Network address — the base address of the block (255.40.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 255.47.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 524,286 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.248.0.0 is the dotted-decimal equivalent of /13. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 255.40.0.0/13 |
| Network Address | 255.40.0.0 |
| Broadcast Address | 255.47.255.255 |
| Subnet Mask | 255.248.0.0 |
| Wildcard Mask | 0.7.255.255 |
| Prefix Length | /13 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 524,288 |
| Usable Host Addresses | 524,286 |
| First Usable IP | 255.40.0.1 |
| Last Usable IP | 255.47.255.254 |
| Network (Hex) | 0xFF280000 |
| Broadcast (Hex) | 0xFF2FFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 13 bits (1s in the mask) identify the network. The remaining 19 bits identify hosts within the network.
Split into Equal Subnets
Split 255.40.0.0/13 into 2 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 255.40.0.0/14 | 255.40.0.0 | 255.40.0.1 | 255.43.255.254 | 255.43.255.255 | 262,142 |
| 2 | 255.44.0.0/14 | 255.44.0.0 | 255.44.0.1 | 255.47.255.254 | 255.47.255.255 | 262,142 |
Split 255.40.0.0/13 into 4 equal /15 subnets (131,070 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 255.40.0.0/15 | 255.40.0.0 | 255.40.0.1 | 255.41.255.254 | 255.41.255.255 | 131,070 |
| 2 | 255.42.0.0/15 | 255.42.0.0 | 255.42.0.1 | 255.43.255.254 | 255.43.255.255 | 131,070 |
| 3 | 255.44.0.0/15 | 255.44.0.0 | 255.44.0.1 | 255.45.255.254 | 255.45.255.255 | 131,070 |
| 4 | 255.46.0.0/15 | 255.46.0.0 | 255.46.0.1 | 255.47.255.254 | 255.47.255.255 | 131,070 |
Split 255.40.0.0/13 into 8 equal /16 subnets (65,534 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 255.40.0.0/16 | 255.40.0.0 | 255.40.0.1 | 255.40.255.254 | 255.40.255.255 | 65,534 |
| 2 | 255.41.0.0/16 | 255.41.0.0 | 255.41.0.1 | 255.41.255.254 | 255.41.255.255 | 65,534 |
| 3 | 255.42.0.0/16 | 255.42.0.0 | 255.42.0.1 | 255.42.255.254 | 255.42.255.255 | 65,534 |
| 4 | 255.43.0.0/16 | 255.43.0.0 | 255.43.0.1 | 255.43.255.254 | 255.43.255.255 | 65,534 |
| 5 | 255.44.0.0/16 | 255.44.0.0 | 255.44.0.1 | 255.44.255.254 | 255.44.255.255 | 65,534 |
| 6 | 255.45.0.0/16 | 255.45.0.0 | 255.45.0.1 | 255.45.255.254 | 255.45.255.255 | 65,534 |
| 7 | 255.46.0.0/16 | 255.46.0.0 | 255.46.0.1 | 255.46.255.254 | 255.46.255.255 | 65,534 |
| 8 | 255.47.0.0/16 | 255.47.0.0 | 255.47.0.1 | 255.47.255.254 | 255.47.255.255 | 65,534 |
Split 255.40.0.0/13 into 16 equal /17 subnets (32,766 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 255.40.0.0/17 | 255.40.0.0 | 255.40.0.1 | 255.40.127.254 | 255.40.127.255 | 32,766 |
| 2 | 255.40.128.0/17 | 255.40.128.0 | 255.40.128.1 | 255.40.255.254 | 255.40.255.255 | 32,766 |
| 3 | 255.41.0.0/17 | 255.41.0.0 | 255.41.0.1 | 255.41.127.254 | 255.41.127.255 | 32,766 |
| 4 | 255.41.128.0/17 | 255.41.128.0 | 255.41.128.1 | 255.41.255.254 | 255.41.255.255 | 32,766 |
| 5 | 255.42.0.0/17 | 255.42.0.0 | 255.42.0.1 | 255.42.127.254 | 255.42.127.255 | 32,766 |
| 6 | 255.42.128.0/17 | 255.42.128.0 | 255.42.128.1 | 255.42.255.254 | 255.42.255.255 | 32,766 |
| 7 | 255.43.0.0/17 | 255.43.0.0 | 255.43.0.1 | 255.43.127.254 | 255.43.127.255 | 32,766 |
| 8 | 255.43.128.0/17 | 255.43.128.0 | 255.43.128.1 | 255.43.255.254 | 255.43.255.255 | 32,766 |
| 9 | 255.44.0.0/17 | 255.44.0.0 | 255.44.0.1 | 255.44.127.254 | 255.44.127.255 | 32,766 |
| 10 | 255.44.128.0/17 | 255.44.128.0 | 255.44.128.1 | 255.44.255.254 | 255.44.255.255 | 32,766 |
| 11 | 255.45.0.0/17 | 255.45.0.0 | 255.45.0.1 | 255.45.127.254 | 255.45.127.255 | 32,766 |
| 12 | 255.45.128.0/17 | 255.45.128.0 | 255.45.128.1 | 255.45.255.254 | 255.45.255.255 | 32,766 |
| 13 | 255.46.0.0/17 | 255.46.0.0 | 255.46.0.1 | 255.46.127.254 | 255.46.127.255 | 32,766 |
| 14 | 255.46.128.0/17 | 255.46.128.0 | 255.46.128.1 | 255.46.255.254 | 255.46.255.255 | 32,766 |
| 15 | 255.47.0.0/17 | 255.47.0.0 | 255.47.0.1 | 255.47.127.254 | 255.47.127.255 | 32,766 |
| 16 | 255.47.128.0/17 | 255.47.128.0 | 255.47.128.1 | 255.47.255.254 | 255.47.255.255 | 32,766 |