51.144.0.0/12
PublicClass A — /12 prefix — 1,048,574 usable hosts
Network address — the base address of the block (51.144.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 51.159.255.255 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 | 51.144.0.0/12 |
| Network Address | 51.144.0.0 |
| Broadcast Address | 51.159.255.255 |
| Subnet Mask | 255.240.0.0 |
| Wildcard Mask | 0.15.255.255 |
| Prefix Length | /12 |
| IP Address Class | Class A |
| Total IP Addresses | 1,048,576 |
| Usable Host Addresses | 1,048,574 |
| First Usable IP | 51.144.0.1 |
| Last Usable IP | 51.159.255.254 |
| Network (Hex) | 0x33900000 |
| Broadcast (Hex) | 0x339FFFFF |
| 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 51.144.0.0/12 into 2 equal /13 subnets (524,286 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 51.144.0.0/13 | 51.144.0.0 | 51.144.0.1 | 51.151.255.254 | 51.151.255.255 | 524,286 |
| 2 | 51.152.0.0/13 | 51.152.0.0 | 51.152.0.1 | 51.159.255.254 | 51.159.255.255 | 524,286 |
Split 51.144.0.0/12 into 4 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 51.144.0.0/14 | 51.144.0.0 | 51.144.0.1 | 51.147.255.254 | 51.147.255.255 | 262,142 |
| 2 | 51.148.0.0/14 | 51.148.0.0 | 51.148.0.1 | 51.151.255.254 | 51.151.255.255 | 262,142 |
| 3 | 51.152.0.0/14 | 51.152.0.0 | 51.152.0.1 | 51.155.255.254 | 51.155.255.255 | 262,142 |
| 4 | 51.156.0.0/14 | 51.156.0.0 | 51.156.0.1 | 51.159.255.254 | 51.159.255.255 | 262,142 |
Split 51.144.0.0/12 into 8 equal /15 subnets (131,070 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 51.144.0.0/15 | 51.144.0.0 | 51.144.0.1 | 51.145.255.254 | 51.145.255.255 | 131,070 |
| 2 | 51.146.0.0/15 | 51.146.0.0 | 51.146.0.1 | 51.147.255.254 | 51.147.255.255 | 131,070 |
| 3 | 51.148.0.0/15 | 51.148.0.0 | 51.148.0.1 | 51.149.255.254 | 51.149.255.255 | 131,070 |
| 4 | 51.150.0.0/15 | 51.150.0.0 | 51.150.0.1 | 51.151.255.254 | 51.151.255.255 | 131,070 |
| 5 | 51.152.0.0/15 | 51.152.0.0 | 51.152.0.1 | 51.153.255.254 | 51.153.255.255 | 131,070 |
| 6 | 51.154.0.0/15 | 51.154.0.0 | 51.154.0.1 | 51.155.255.254 | 51.155.255.255 | 131,070 |
| 7 | 51.156.0.0/15 | 51.156.0.0 | 51.156.0.1 | 51.157.255.254 | 51.157.255.255 | 131,070 |
| 8 | 51.158.0.0/15 | 51.158.0.0 | 51.158.0.1 | 51.159.255.254 | 51.159.255.255 | 131,070 |
Split 51.144.0.0/12 into 16 equal /16 subnets (65,534 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 51.144.0.0/16 | 51.144.0.0 | 51.144.0.1 | 51.144.255.254 | 51.144.255.255 | 65,534 |
| 2 | 51.145.0.0/16 | 51.145.0.0 | 51.145.0.1 | 51.145.255.254 | 51.145.255.255 | 65,534 |
| 3 | 51.146.0.0/16 | 51.146.0.0 | 51.146.0.1 | 51.146.255.254 | 51.146.255.255 | 65,534 |
| 4 | 51.147.0.0/16 | 51.147.0.0 | 51.147.0.1 | 51.147.255.254 | 51.147.255.255 | 65,534 |
| 5 | 51.148.0.0/16 | 51.148.0.0 | 51.148.0.1 | 51.148.255.254 | 51.148.255.255 | 65,534 |
| 6 | 51.149.0.0/16 | 51.149.0.0 | 51.149.0.1 | 51.149.255.254 | 51.149.255.255 | 65,534 |
| 7 | 51.150.0.0/16 | 51.150.0.0 | 51.150.0.1 | 51.150.255.254 | 51.150.255.255 | 65,534 |
| 8 | 51.151.0.0/16 | 51.151.0.0 | 51.151.0.1 | 51.151.255.254 | 51.151.255.255 | 65,534 |
| 9 | 51.152.0.0/16 | 51.152.0.0 | 51.152.0.1 | 51.152.255.254 | 51.152.255.255 | 65,534 |
| 10 | 51.153.0.0/16 | 51.153.0.0 | 51.153.0.1 | 51.153.255.254 | 51.153.255.255 | 65,534 |
| 11 | 51.154.0.0/16 | 51.154.0.0 | 51.154.0.1 | 51.154.255.254 | 51.154.255.255 | 65,534 |
| 12 | 51.155.0.0/16 | 51.155.0.0 | 51.155.0.1 | 51.155.255.254 | 51.155.255.255 | 65,534 |
| 13 | 51.156.0.0/16 | 51.156.0.0 | 51.156.0.1 | 51.156.255.254 | 51.156.255.255 | 65,534 |
| 14 | 51.157.0.0/16 | 51.157.0.0 | 51.157.0.1 | 51.157.255.254 | 51.157.255.255 | 65,534 |
| 15 | 51.158.0.0/16 | 51.158.0.0 | 51.158.0.1 | 51.158.255.254 | 51.158.255.255 | 65,534 |
| 16 | 51.159.0.0/16 | 51.159.0.0 | 51.159.0.1 | 51.159.255.254 | 51.159.255.255 | 65,534 |