203.0.0.0/10
PublicClass C — /10 prefix — 4,194,302 usable hosts
Network address — the base address of the block (203.0.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 203.63.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 4,194,302 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.192.0.0 is the dotted-decimal equivalent of /10. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 203.0.0.0/10 |
| Network Address | 203.0.0.0 |
| Broadcast Address | 203.63.255.255 |
| Subnet Mask | 255.192.0.0 |
| Wildcard Mask | 0.63.255.255 |
| Prefix Length | /10 |
| IP Address Class | Class C |
| Total IP Addresses | 4,194,304 |
| Usable Host Addresses | 4,194,302 |
| First Usable IP | 203.0.0.1 |
| Last Usable IP | 203.63.255.254 |
| Network (Hex) | 0xCB000000 |
| Broadcast (Hex) | 0xCB3FFFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 10 bits (1s in the mask) identify the network. The remaining 22 bits identify hosts within the network.
Split into Equal Subnets
Split 203.0.0.0/10 into 2 equal /11 subnets (2,097,150 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 203.0.0.0/11 | 203.0.0.0 | 203.0.0.1 | 203.31.255.254 | 203.31.255.255 | 2,097,150 |
| 2 | 203.32.0.0/11 | 203.32.0.0 | 203.32.0.1 | 203.63.255.254 | 203.63.255.255 | 2,097,150 |
Split 203.0.0.0/10 into 4 equal /12 subnets (1,048,574 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 203.0.0.0/12 | 203.0.0.0 | 203.0.0.1 | 203.15.255.254 | 203.15.255.255 | 1,048,574 |
| 2 | 203.16.0.0/12 | 203.16.0.0 | 203.16.0.1 | 203.31.255.254 | 203.31.255.255 | 1,048,574 |
| 3 | 203.32.0.0/12 | 203.32.0.0 | 203.32.0.1 | 203.47.255.254 | 203.47.255.255 | 1,048,574 |
| 4 | 203.48.0.0/12 | 203.48.0.0 | 203.48.0.1 | 203.63.255.254 | 203.63.255.255 | 1,048,574 |
Split 203.0.0.0/10 into 8 equal /13 subnets (524,286 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 203.0.0.0/13 | 203.0.0.0 | 203.0.0.1 | 203.7.255.254 | 203.7.255.255 | 524,286 |
| 2 | 203.8.0.0/13 | 203.8.0.0 | 203.8.0.1 | 203.15.255.254 | 203.15.255.255 | 524,286 |
| 3 | 203.16.0.0/13 | 203.16.0.0 | 203.16.0.1 | 203.23.255.254 | 203.23.255.255 | 524,286 |
| 4 | 203.24.0.0/13 | 203.24.0.0 | 203.24.0.1 | 203.31.255.254 | 203.31.255.255 | 524,286 |
| 5 | 203.32.0.0/13 | 203.32.0.0 | 203.32.0.1 | 203.39.255.254 | 203.39.255.255 | 524,286 |
| 6 | 203.40.0.0/13 | 203.40.0.0 | 203.40.0.1 | 203.47.255.254 | 203.47.255.255 | 524,286 |
| 7 | 203.48.0.0/13 | 203.48.0.0 | 203.48.0.1 | 203.55.255.254 | 203.55.255.255 | 524,286 |
| 8 | 203.56.0.0/13 | 203.56.0.0 | 203.56.0.1 | 203.63.255.254 | 203.63.255.255 | 524,286 |
Split 203.0.0.0/10 into 16 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 203.0.0.0/14 | 203.0.0.0 | 203.0.0.1 | 203.3.255.254 | 203.3.255.255 | 262,142 |
| 2 | 203.4.0.0/14 | 203.4.0.0 | 203.4.0.1 | 203.7.255.254 | 203.7.255.255 | 262,142 |
| 3 | 203.8.0.0/14 | 203.8.0.0 | 203.8.0.1 | 203.11.255.254 | 203.11.255.255 | 262,142 |
| 4 | 203.12.0.0/14 | 203.12.0.0 | 203.12.0.1 | 203.15.255.254 | 203.15.255.255 | 262,142 |
| 5 | 203.16.0.0/14 | 203.16.0.0 | 203.16.0.1 | 203.19.255.254 | 203.19.255.255 | 262,142 |
| 6 | 203.20.0.0/14 | 203.20.0.0 | 203.20.0.1 | 203.23.255.254 | 203.23.255.255 | 262,142 |
| 7 | 203.24.0.0/14 | 203.24.0.0 | 203.24.0.1 | 203.27.255.254 | 203.27.255.255 | 262,142 |
| 8 | 203.28.0.0/14 | 203.28.0.0 | 203.28.0.1 | 203.31.255.254 | 203.31.255.255 | 262,142 |
| 9 | 203.32.0.0/14 | 203.32.0.0 | 203.32.0.1 | 203.35.255.254 | 203.35.255.255 | 262,142 |
| 10 | 203.36.0.0/14 | 203.36.0.0 | 203.36.0.1 | 203.39.255.254 | 203.39.255.255 | 262,142 |
| 11 | 203.40.0.0/14 | 203.40.0.0 | 203.40.0.1 | 203.43.255.254 | 203.43.255.255 | 262,142 |
| 12 | 203.44.0.0/14 | 203.44.0.0 | 203.44.0.1 | 203.47.255.254 | 203.47.255.255 | 262,142 |
| 13 | 203.48.0.0/14 | 203.48.0.0 | 203.48.0.1 | 203.51.255.254 | 203.51.255.255 | 262,142 |
| 14 | 203.52.0.0/14 | 203.52.0.0 | 203.52.0.1 | 203.55.255.254 | 203.55.255.255 | 262,142 |
| 15 | 203.56.0.0/14 | 203.56.0.0 | 203.56.0.1 | 203.59.255.254 | 203.59.255.255 | 262,142 |
| 16 | 203.60.0.0/14 | 203.60.0.0 | 203.60.0.1 | 203.63.255.254 | 203.63.255.255 | 262,142 |