10.128.0.0/13
Private (RFC 1918) RFC 1918Class A — /13 prefix — 524,286 usable hosts
Network address — the base address of the block (10.128.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 10.135.255.255 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 | 10.128.0.0/13 |
| Network Address | 10.128.0.0 |
| Broadcast Address | 10.135.255.255 |
| Subnet Mask | 255.248.0.0 |
| Wildcard Mask | 0.7.255.255 |
| Prefix Length | /13 |
| IP Address Class | Class A |
| Total IP Addresses | 524,288 |
| Usable Host Addresses | 524,286 |
| First Usable IP | 10.128.0.1 |
| Last Usable IP | 10.135.255.254 |
| Network (Hex) | 0x0A800000 |
| Broadcast (Hex) | 0x0A87FFFF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
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 10.128.0.0/13 into 2 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.128.0.0/14 | 10.128.0.0 | 10.128.0.1 | 10.131.255.254 | 10.131.255.255 | 262,142 |
| 2 | 10.132.0.0/14 | 10.132.0.0 | 10.132.0.1 | 10.135.255.254 | 10.135.255.255 | 262,142 |
Split 10.128.0.0/13 into 4 equal /15 subnets (131,070 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.128.0.0/15 | 10.128.0.0 | 10.128.0.1 | 10.129.255.254 | 10.129.255.255 | 131,070 |
| 2 | 10.130.0.0/15 | 10.130.0.0 | 10.130.0.1 | 10.131.255.254 | 10.131.255.255 | 131,070 |
| 3 | 10.132.0.0/15 | 10.132.0.0 | 10.132.0.1 | 10.133.255.254 | 10.133.255.255 | 131,070 |
| 4 | 10.134.0.0/15 | 10.134.0.0 | 10.134.0.1 | 10.135.255.254 | 10.135.255.255 | 131,070 |
Split 10.128.0.0/13 into 8 equal /16 subnets (65,534 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.128.0.0/16 | 10.128.0.0 | 10.128.0.1 | 10.128.255.254 | 10.128.255.255 | 65,534 |
| 2 | 10.129.0.0/16 | 10.129.0.0 | 10.129.0.1 | 10.129.255.254 | 10.129.255.255 | 65,534 |
| 3 | 10.130.0.0/16 | 10.130.0.0 | 10.130.0.1 | 10.130.255.254 | 10.130.255.255 | 65,534 |
| 4 | 10.131.0.0/16 | 10.131.0.0 | 10.131.0.1 | 10.131.255.254 | 10.131.255.255 | 65,534 |
| 5 | 10.132.0.0/16 | 10.132.0.0 | 10.132.0.1 | 10.132.255.254 | 10.132.255.255 | 65,534 |
| 6 | 10.133.0.0/16 | 10.133.0.0 | 10.133.0.1 | 10.133.255.254 | 10.133.255.255 | 65,534 |
| 7 | 10.134.0.0/16 | 10.134.0.0 | 10.134.0.1 | 10.134.255.254 | 10.134.255.255 | 65,534 |
| 8 | 10.135.0.0/16 | 10.135.0.0 | 10.135.0.1 | 10.135.255.254 | 10.135.255.255 | 65,534 |
Split 10.128.0.0/13 into 16 equal /17 subnets (32,766 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.128.0.0/17 | 10.128.0.0 | 10.128.0.1 | 10.128.127.254 | 10.128.127.255 | 32,766 |
| 2 | 10.128.128.0/17 | 10.128.128.0 | 10.128.128.1 | 10.128.255.254 | 10.128.255.255 | 32,766 |
| 3 | 10.129.0.0/17 | 10.129.0.0 | 10.129.0.1 | 10.129.127.254 | 10.129.127.255 | 32,766 |
| 4 | 10.129.128.0/17 | 10.129.128.0 | 10.129.128.1 | 10.129.255.254 | 10.129.255.255 | 32,766 |
| 5 | 10.130.0.0/17 | 10.130.0.0 | 10.130.0.1 | 10.130.127.254 | 10.130.127.255 | 32,766 |
| 6 | 10.130.128.0/17 | 10.130.128.0 | 10.130.128.1 | 10.130.255.254 | 10.130.255.255 | 32,766 |
| 7 | 10.131.0.0/17 | 10.131.0.0 | 10.131.0.1 | 10.131.127.254 | 10.131.127.255 | 32,766 |
| 8 | 10.131.128.0/17 | 10.131.128.0 | 10.131.128.1 | 10.131.255.254 | 10.131.255.255 | 32,766 |
| 9 | 10.132.0.0/17 | 10.132.0.0 | 10.132.0.1 | 10.132.127.254 | 10.132.127.255 | 32,766 |
| 10 | 10.132.128.0/17 | 10.132.128.0 | 10.132.128.1 | 10.132.255.254 | 10.132.255.255 | 32,766 |
| 11 | 10.133.0.0/17 | 10.133.0.0 | 10.133.0.1 | 10.133.127.254 | 10.133.127.255 | 32,766 |
| 12 | 10.133.128.0/17 | 10.133.128.0 | 10.133.128.1 | 10.133.255.254 | 10.133.255.255 | 32,766 |
| 13 | 10.134.0.0/17 | 10.134.0.0 | 10.134.0.1 | 10.134.127.254 | 10.134.127.255 | 32,766 |
| 14 | 10.134.128.0/17 | 10.134.128.0 | 10.134.128.1 | 10.134.255.254 | 10.134.255.255 | 32,766 |
| 15 | 10.135.0.0/17 | 10.135.0.0 | 10.135.0.1 | 10.135.127.254 | 10.135.127.255 | 32,766 |
| 16 | 10.135.128.0/17 | 10.135.128.0 | 10.135.128.1 | 10.135.255.254 | 10.135.255.255 | 32,766 |