243.176.0.0/12
PublicClass E (Reserved) — /12 prefix — 1,048,574 usable hosts
Network address — the base address of the block (243.176.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 243.191.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 1,048,574 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.240.0.0 is the dotted-decimal equivalent of /12. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 243.176.0.0/12 |
| Network Address | 243.176.0.0 |
| Broadcast Address | 243.191.255.255 |
| Subnet Mask | 255.240.0.0 |
| Wildcard Mask | 0.15.255.255 |
| Prefix Length | /12 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 1,048,576 |
| Usable Host Addresses | 1,048,574 |
| First Usable IP | 243.176.0.1 |
| Last Usable IP | 243.191.255.254 |
| Network (Hex) | 0xF3B00000 |
| Broadcast (Hex) | 0xF3BFFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 12 bits (1s in the mask) identify the network. The remaining 20 bits identify hosts within the network.
Split into Equal Subnets
Split 243.176.0.0/12 into 2 equal /13 subnets (524,286 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 243.176.0.0/13 | 243.176.0.0 | 243.176.0.1 | 243.183.255.254 | 243.183.255.255 | 524,286 |
| 2 | 243.184.0.0/13 | 243.184.0.0 | 243.184.0.1 | 243.191.255.254 | 243.191.255.255 | 524,286 |
Split 243.176.0.0/12 into 4 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 243.176.0.0/14 | 243.176.0.0 | 243.176.0.1 | 243.179.255.254 | 243.179.255.255 | 262,142 |
| 2 | 243.180.0.0/14 | 243.180.0.0 | 243.180.0.1 | 243.183.255.254 | 243.183.255.255 | 262,142 |
| 3 | 243.184.0.0/14 | 243.184.0.0 | 243.184.0.1 | 243.187.255.254 | 243.187.255.255 | 262,142 |
| 4 | 243.188.0.0/14 | 243.188.0.0 | 243.188.0.1 | 243.191.255.254 | 243.191.255.255 | 262,142 |
Split 243.176.0.0/12 into 8 equal /15 subnets (131,070 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 243.176.0.0/15 | 243.176.0.0 | 243.176.0.1 | 243.177.255.254 | 243.177.255.255 | 131,070 |
| 2 | 243.178.0.0/15 | 243.178.0.0 | 243.178.0.1 | 243.179.255.254 | 243.179.255.255 | 131,070 |
| 3 | 243.180.0.0/15 | 243.180.0.0 | 243.180.0.1 | 243.181.255.254 | 243.181.255.255 | 131,070 |
| 4 | 243.182.0.0/15 | 243.182.0.0 | 243.182.0.1 | 243.183.255.254 | 243.183.255.255 | 131,070 |
| 5 | 243.184.0.0/15 | 243.184.0.0 | 243.184.0.1 | 243.185.255.254 | 243.185.255.255 | 131,070 |
| 6 | 243.186.0.0/15 | 243.186.0.0 | 243.186.0.1 | 243.187.255.254 | 243.187.255.255 | 131,070 |
| 7 | 243.188.0.0/15 | 243.188.0.0 | 243.188.0.1 | 243.189.255.254 | 243.189.255.255 | 131,070 |
| 8 | 243.190.0.0/15 | 243.190.0.0 | 243.190.0.1 | 243.191.255.254 | 243.191.255.255 | 131,070 |
Split 243.176.0.0/12 into 16 equal /16 subnets (65,534 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 243.176.0.0/16 | 243.176.0.0 | 243.176.0.1 | 243.176.255.254 | 243.176.255.255 | 65,534 |
| 2 | 243.177.0.0/16 | 243.177.0.0 | 243.177.0.1 | 243.177.255.254 | 243.177.255.255 | 65,534 |
| 3 | 243.178.0.0/16 | 243.178.0.0 | 243.178.0.1 | 243.178.255.254 | 243.178.255.255 | 65,534 |
| 4 | 243.179.0.0/16 | 243.179.0.0 | 243.179.0.1 | 243.179.255.254 | 243.179.255.255 | 65,534 |
| 5 | 243.180.0.0/16 | 243.180.0.0 | 243.180.0.1 | 243.180.255.254 | 243.180.255.255 | 65,534 |
| 6 | 243.181.0.0/16 | 243.181.0.0 | 243.181.0.1 | 243.181.255.254 | 243.181.255.255 | 65,534 |
| 7 | 243.182.0.0/16 | 243.182.0.0 | 243.182.0.1 | 243.182.255.254 | 243.182.255.255 | 65,534 |
| 8 | 243.183.0.0/16 | 243.183.0.0 | 243.183.0.1 | 243.183.255.254 | 243.183.255.255 | 65,534 |
| 9 | 243.184.0.0/16 | 243.184.0.0 | 243.184.0.1 | 243.184.255.254 | 243.184.255.255 | 65,534 |
| 10 | 243.185.0.0/16 | 243.185.0.0 | 243.185.0.1 | 243.185.255.254 | 243.185.255.255 | 65,534 |
| 11 | 243.186.0.0/16 | 243.186.0.0 | 243.186.0.1 | 243.186.255.254 | 243.186.255.255 | 65,534 |
| 12 | 243.187.0.0/16 | 243.187.0.0 | 243.187.0.1 | 243.187.255.254 | 243.187.255.255 | 65,534 |
| 13 | 243.188.0.0/16 | 243.188.0.0 | 243.188.0.1 | 243.188.255.254 | 243.188.255.255 | 65,534 |
| 14 | 243.189.0.0/16 | 243.189.0.0 | 243.189.0.1 | 243.189.255.254 | 243.189.255.255 | 65,534 |
| 15 | 243.190.0.0/16 | 243.190.0.0 | 243.190.0.1 | 243.190.255.254 | 243.190.255.255 | 65,534 |
| 16 | 243.191.0.0/16 | 243.191.0.0 | 243.191.0.1 | 243.191.255.254 | 243.191.255.255 | 65,534 |