231.31.166.0/25
Multicast RFC 5771Class D (Multicast) — /25 prefix — 126 usable hosts
Network address — the base address of the block (231.31.166.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 231.31.166.127 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 231.31.166.0/25 |
| Network Address | 231.31.166.0 |
| Broadcast Address | 231.31.166.127 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class D (Multicast) |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 231.31.166.1 |
| Last Usable IP | 231.31.166.126 |
| Network (Hex) | 0xE71FA600 |
| Broadcast (Hex) | 0xE71FA67F |
| Governing RFC | RFC 5771 |
| Address Type | Multicast |
Binary Representation
The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.
Split into Equal Subnets
Split 231.31.166.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.31.166.0/26 | 231.31.166.0 | 231.31.166.1 | 231.31.166.62 | 231.31.166.63 | 62 |
| 2 | 231.31.166.64/26 | 231.31.166.64 | 231.31.166.65 | 231.31.166.126 | 231.31.166.127 | 62 |
Split 231.31.166.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.31.166.0/27 | 231.31.166.0 | 231.31.166.1 | 231.31.166.30 | 231.31.166.31 | 30 |
| 2 | 231.31.166.32/27 | 231.31.166.32 | 231.31.166.33 | 231.31.166.62 | 231.31.166.63 | 30 |
| 3 | 231.31.166.64/27 | 231.31.166.64 | 231.31.166.65 | 231.31.166.94 | 231.31.166.95 | 30 |
| 4 | 231.31.166.96/27 | 231.31.166.96 | 231.31.166.97 | 231.31.166.126 | 231.31.166.127 | 30 |
Split 231.31.166.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.31.166.0/28 | 231.31.166.0 | 231.31.166.1 | 231.31.166.14 | 231.31.166.15 | 14 |
| 2 | 231.31.166.16/28 | 231.31.166.16 | 231.31.166.17 | 231.31.166.30 | 231.31.166.31 | 14 |
| 3 | 231.31.166.32/28 | 231.31.166.32 | 231.31.166.33 | 231.31.166.46 | 231.31.166.47 | 14 |
| 4 | 231.31.166.48/28 | 231.31.166.48 | 231.31.166.49 | 231.31.166.62 | 231.31.166.63 | 14 |
| 5 | 231.31.166.64/28 | 231.31.166.64 | 231.31.166.65 | 231.31.166.78 | 231.31.166.79 | 14 |
| 6 | 231.31.166.80/28 | 231.31.166.80 | 231.31.166.81 | 231.31.166.94 | 231.31.166.95 | 14 |
| 7 | 231.31.166.96/28 | 231.31.166.96 | 231.31.166.97 | 231.31.166.110 | 231.31.166.111 | 14 |
| 8 | 231.31.166.112/28 | 231.31.166.112 | 231.31.166.113 | 231.31.166.126 | 231.31.166.127 | 14 |
Split 231.31.166.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.31.166.0/29 | 231.31.166.0 | 231.31.166.1 | 231.31.166.6 | 231.31.166.7 | 6 |
| 2 | 231.31.166.8/29 | 231.31.166.8 | 231.31.166.9 | 231.31.166.14 | 231.31.166.15 | 6 |
| 3 | 231.31.166.16/29 | 231.31.166.16 | 231.31.166.17 | 231.31.166.22 | 231.31.166.23 | 6 |
| 4 | 231.31.166.24/29 | 231.31.166.24 | 231.31.166.25 | 231.31.166.30 | 231.31.166.31 | 6 |
| 5 | 231.31.166.32/29 | 231.31.166.32 | 231.31.166.33 | 231.31.166.38 | 231.31.166.39 | 6 |
| 6 | 231.31.166.40/29 | 231.31.166.40 | 231.31.166.41 | 231.31.166.46 | 231.31.166.47 | 6 |
| 7 | 231.31.166.48/29 | 231.31.166.48 | 231.31.166.49 | 231.31.166.54 | 231.31.166.55 | 6 |
| 8 | 231.31.166.56/29 | 231.31.166.56 | 231.31.166.57 | 231.31.166.62 | 231.31.166.63 | 6 |
| 9 | 231.31.166.64/29 | 231.31.166.64 | 231.31.166.65 | 231.31.166.70 | 231.31.166.71 | 6 |
| 10 | 231.31.166.72/29 | 231.31.166.72 | 231.31.166.73 | 231.31.166.78 | 231.31.166.79 | 6 |
| 11 | 231.31.166.80/29 | 231.31.166.80 | 231.31.166.81 | 231.31.166.86 | 231.31.166.87 | 6 |
| 12 | 231.31.166.88/29 | 231.31.166.88 | 231.31.166.89 | 231.31.166.94 | 231.31.166.95 | 6 |
| 13 | 231.31.166.96/29 | 231.31.166.96 | 231.31.166.97 | 231.31.166.102 | 231.31.166.103 | 6 |
| 14 | 231.31.166.104/29 | 231.31.166.104 | 231.31.166.105 | 231.31.166.110 | 231.31.166.111 | 6 |
| 15 | 231.31.166.112/29 | 231.31.166.112 | 231.31.166.113 | 231.31.166.118 | 231.31.166.119 | 6 |
| 16 | 231.31.166.120/29 | 231.31.166.120 | 231.31.166.121 | 231.31.166.126 | 231.31.166.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.