231.4.0.0/18
Multicast RFC 5771Class D (Multicast) — /18 prefix — 16,382 usable hosts
Network address — the base address of the block (231.4.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 231.4.63.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 16,382 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.192.0 is the dotted-decimal equivalent of /18. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 231.4.0.0/18 |
| Network Address | 231.4.0.0 |
| Broadcast Address | 231.4.63.255 |
| Subnet Mask | 255.255.192.0 |
| Wildcard Mask | 0.0.63.255 |
| Prefix Length | /18 |
| IP Address Class | Class D (Multicast) |
| Total IP Addresses | 16,384 |
| Usable Host Addresses | 16,382 |
| First Usable IP | 231.4.0.1 |
| Last Usable IP | 231.4.63.254 |
| Network (Hex) | 0xE7040000 |
| Broadcast (Hex) | 0xE7043FFF |
| Governing RFC | RFC 5771 |
| Address Type | Multicast |
Binary Representation
The first 18 bits (1s in the mask) identify the network. The remaining 14 bits identify hosts within the network.
Split into Equal Subnets
Split 231.4.0.0/18 into 2 equal /19 subnets (8,190 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.4.0.0/19 | 231.4.0.0 | 231.4.0.1 | 231.4.31.254 | 231.4.31.255 | 8,190 |
| 2 | 231.4.32.0/19 | 231.4.32.0 | 231.4.32.1 | 231.4.63.254 | 231.4.63.255 | 8,190 |
Split 231.4.0.0/18 into 4 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.4.0.0/20 | 231.4.0.0 | 231.4.0.1 | 231.4.15.254 | 231.4.15.255 | 4,094 |
| 2 | 231.4.16.0/20 | 231.4.16.0 | 231.4.16.1 | 231.4.31.254 | 231.4.31.255 | 4,094 |
| 3 | 231.4.32.0/20 | 231.4.32.0 | 231.4.32.1 | 231.4.47.254 | 231.4.47.255 | 4,094 |
| 4 | 231.4.48.0/20 | 231.4.48.0 | 231.4.48.1 | 231.4.63.254 | 231.4.63.255 | 4,094 |
Split 231.4.0.0/18 into 8 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.4.0.0/21 | 231.4.0.0 | 231.4.0.1 | 231.4.7.254 | 231.4.7.255 | 2,046 |
| 2 | 231.4.8.0/21 | 231.4.8.0 | 231.4.8.1 | 231.4.15.254 | 231.4.15.255 | 2,046 |
| 3 | 231.4.16.0/21 | 231.4.16.0 | 231.4.16.1 | 231.4.23.254 | 231.4.23.255 | 2,046 |
| 4 | 231.4.24.0/21 | 231.4.24.0 | 231.4.24.1 | 231.4.31.254 | 231.4.31.255 | 2,046 |
| 5 | 231.4.32.0/21 | 231.4.32.0 | 231.4.32.1 | 231.4.39.254 | 231.4.39.255 | 2,046 |
| 6 | 231.4.40.0/21 | 231.4.40.0 | 231.4.40.1 | 231.4.47.254 | 231.4.47.255 | 2,046 |
| 7 | 231.4.48.0/21 | 231.4.48.0 | 231.4.48.1 | 231.4.55.254 | 231.4.55.255 | 2,046 |
| 8 | 231.4.56.0/21 | 231.4.56.0 | 231.4.56.1 | 231.4.63.254 | 231.4.63.255 | 2,046 |
Split 231.4.0.0/18 into 16 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.4.0.0/22 | 231.4.0.0 | 231.4.0.1 | 231.4.3.254 | 231.4.3.255 | 1,022 |
| 2 | 231.4.4.0/22 | 231.4.4.0 | 231.4.4.1 | 231.4.7.254 | 231.4.7.255 | 1,022 |
| 3 | 231.4.8.0/22 | 231.4.8.0 | 231.4.8.1 | 231.4.11.254 | 231.4.11.255 | 1,022 |
| 4 | 231.4.12.0/22 | 231.4.12.0 | 231.4.12.1 | 231.4.15.254 | 231.4.15.255 | 1,022 |
| 5 | 231.4.16.0/22 | 231.4.16.0 | 231.4.16.1 | 231.4.19.254 | 231.4.19.255 | 1,022 |
| 6 | 231.4.20.0/22 | 231.4.20.0 | 231.4.20.1 | 231.4.23.254 | 231.4.23.255 | 1,022 |
| 7 | 231.4.24.0/22 | 231.4.24.0 | 231.4.24.1 | 231.4.27.254 | 231.4.27.255 | 1,022 |
| 8 | 231.4.28.0/22 | 231.4.28.0 | 231.4.28.1 | 231.4.31.254 | 231.4.31.255 | 1,022 |
| 9 | 231.4.32.0/22 | 231.4.32.0 | 231.4.32.1 | 231.4.35.254 | 231.4.35.255 | 1,022 |
| 10 | 231.4.36.0/22 | 231.4.36.0 | 231.4.36.1 | 231.4.39.254 | 231.4.39.255 | 1,022 |
| 11 | 231.4.40.0/22 | 231.4.40.0 | 231.4.40.1 | 231.4.43.254 | 231.4.43.255 | 1,022 |
| 12 | 231.4.44.0/22 | 231.4.44.0 | 231.4.44.1 | 231.4.47.254 | 231.4.47.255 | 1,022 |
| 13 | 231.4.48.0/22 | 231.4.48.0 | 231.4.48.1 | 231.4.51.254 | 231.4.51.255 | 1,022 |
| 14 | 231.4.52.0/22 | 231.4.52.0 | 231.4.52.1 | 231.4.55.254 | 231.4.55.255 | 1,022 |
| 15 | 231.4.56.0/22 | 231.4.56.0 | 231.4.56.1 | 231.4.59.254 | 231.4.59.255 | 1,022 |
| 16 | 231.4.60.0/22 | 231.4.60.0 | 231.4.60.1 | 231.4.63.254 | 231.4.63.255 | 1,022 |