242.128.0.0/10
PublicClass E (Reserved) — /10 prefix — 4,194,302 usable hosts
Network address — the base address of the block (242.128.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 242.191.255.255 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 | 242.128.0.0/10 |
| Network Address | 242.128.0.0 |
| Broadcast Address | 242.191.255.255 |
| Subnet Mask | 255.192.0.0 |
| Wildcard Mask | 0.63.255.255 |
| Prefix Length | /10 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 4,194,304 |
| Usable Host Addresses | 4,194,302 |
| First Usable IP | 242.128.0.1 |
| Last Usable IP | 242.191.255.254 |
| Network (Hex) | 0xF2800000 |
| Broadcast (Hex) | 0xF2BFFFFF |
| 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 242.128.0.0/10 into 2 equal /11 subnets (2,097,150 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 242.128.0.0/11 | 242.128.0.0 | 242.128.0.1 | 242.159.255.254 | 242.159.255.255 | 2,097,150 |
| 2 | 242.160.0.0/11 | 242.160.0.0 | 242.160.0.1 | 242.191.255.254 | 242.191.255.255 | 2,097,150 |
Split 242.128.0.0/10 into 4 equal /12 subnets (1,048,574 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 242.128.0.0/12 | 242.128.0.0 | 242.128.0.1 | 242.143.255.254 | 242.143.255.255 | 1,048,574 |
| 2 | 242.144.0.0/12 | 242.144.0.0 | 242.144.0.1 | 242.159.255.254 | 242.159.255.255 | 1,048,574 |
| 3 | 242.160.0.0/12 | 242.160.0.0 | 242.160.0.1 | 242.175.255.254 | 242.175.255.255 | 1,048,574 |
| 4 | 242.176.0.0/12 | 242.176.0.0 | 242.176.0.1 | 242.191.255.254 | 242.191.255.255 | 1,048,574 |
Split 242.128.0.0/10 into 8 equal /13 subnets (524,286 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 242.128.0.0/13 | 242.128.0.0 | 242.128.0.1 | 242.135.255.254 | 242.135.255.255 | 524,286 |
| 2 | 242.136.0.0/13 | 242.136.0.0 | 242.136.0.1 | 242.143.255.254 | 242.143.255.255 | 524,286 |
| 3 | 242.144.0.0/13 | 242.144.0.0 | 242.144.0.1 | 242.151.255.254 | 242.151.255.255 | 524,286 |
| 4 | 242.152.0.0/13 | 242.152.0.0 | 242.152.0.1 | 242.159.255.254 | 242.159.255.255 | 524,286 |
| 5 | 242.160.0.0/13 | 242.160.0.0 | 242.160.0.1 | 242.167.255.254 | 242.167.255.255 | 524,286 |
| 6 | 242.168.0.0/13 | 242.168.0.0 | 242.168.0.1 | 242.175.255.254 | 242.175.255.255 | 524,286 |
| 7 | 242.176.0.0/13 | 242.176.0.0 | 242.176.0.1 | 242.183.255.254 | 242.183.255.255 | 524,286 |
| 8 | 242.184.0.0/13 | 242.184.0.0 | 242.184.0.1 | 242.191.255.254 | 242.191.255.255 | 524,286 |
Split 242.128.0.0/10 into 16 equal /14 subnets (262,142 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 242.128.0.0/14 | 242.128.0.0 | 242.128.0.1 | 242.131.255.254 | 242.131.255.255 | 262,142 |
| 2 | 242.132.0.0/14 | 242.132.0.0 | 242.132.0.1 | 242.135.255.254 | 242.135.255.255 | 262,142 |
| 3 | 242.136.0.0/14 | 242.136.0.0 | 242.136.0.1 | 242.139.255.254 | 242.139.255.255 | 262,142 |
| 4 | 242.140.0.0/14 | 242.140.0.0 | 242.140.0.1 | 242.143.255.254 | 242.143.255.255 | 262,142 |
| 5 | 242.144.0.0/14 | 242.144.0.0 | 242.144.0.1 | 242.147.255.254 | 242.147.255.255 | 262,142 |
| 6 | 242.148.0.0/14 | 242.148.0.0 | 242.148.0.1 | 242.151.255.254 | 242.151.255.255 | 262,142 |
| 7 | 242.152.0.0/14 | 242.152.0.0 | 242.152.0.1 | 242.155.255.254 | 242.155.255.255 | 262,142 |
| 8 | 242.156.0.0/14 | 242.156.0.0 | 242.156.0.1 | 242.159.255.254 | 242.159.255.255 | 262,142 |
| 9 | 242.160.0.0/14 | 242.160.0.0 | 242.160.0.1 | 242.163.255.254 | 242.163.255.255 | 262,142 |
| 10 | 242.164.0.0/14 | 242.164.0.0 | 242.164.0.1 | 242.167.255.254 | 242.167.255.255 | 262,142 |
| 11 | 242.168.0.0/14 | 242.168.0.0 | 242.168.0.1 | 242.171.255.254 | 242.171.255.255 | 262,142 |
| 12 | 242.172.0.0/14 | 242.172.0.0 | 242.172.0.1 | 242.175.255.254 | 242.175.255.255 | 262,142 |
| 13 | 242.176.0.0/14 | 242.176.0.0 | 242.176.0.1 | 242.179.255.254 | 242.179.255.255 | 262,142 |
| 14 | 242.180.0.0/14 | 242.180.0.0 | 242.180.0.1 | 242.183.255.254 | 242.183.255.255 | 262,142 |
| 15 | 242.184.0.0/14 | 242.184.0.0 | 242.184.0.1 | 242.187.255.254 | 242.187.255.255 | 262,142 |
| 16 | 242.188.0.0/14 | 242.188.0.0 | 242.188.0.1 | 242.191.255.254 | 242.191.255.255 | 262,142 |