231.11.18.128/25
Multicast RFC 5771Class D (Multicast) — /25 prefix — 126 usable hosts
Network address — the base address of the block (231.11.18.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 231.11.18.255 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 | 231.11.18.128/25 |
| Network Address | 231.11.18.128 |
| Broadcast Address | 231.11.18.255 |
| 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 | 231.11.18.129 |
| Last Usable IP | 231.11.18.254 |
| Network (Hex) | 0xE70B1280 |
| Broadcast (Hex) | 0xE70B12FF |
| 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 231.11.18.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.11.18.128/26 | 231.11.18.128 | 231.11.18.129 | 231.11.18.190 | 231.11.18.191 | 62 |
| 2 | 231.11.18.192/26 | 231.11.18.192 | 231.11.18.193 | 231.11.18.254 | 231.11.18.255 | 62 |
Split 231.11.18.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.11.18.128/27 | 231.11.18.128 | 231.11.18.129 | 231.11.18.158 | 231.11.18.159 | 30 |
| 2 | 231.11.18.160/27 | 231.11.18.160 | 231.11.18.161 | 231.11.18.190 | 231.11.18.191 | 30 |
| 3 | 231.11.18.192/27 | 231.11.18.192 | 231.11.18.193 | 231.11.18.222 | 231.11.18.223 | 30 |
| 4 | 231.11.18.224/27 | 231.11.18.224 | 231.11.18.225 | 231.11.18.254 | 231.11.18.255 | 30 |
Split 231.11.18.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.11.18.128/28 | 231.11.18.128 | 231.11.18.129 | 231.11.18.142 | 231.11.18.143 | 14 |
| 2 | 231.11.18.144/28 | 231.11.18.144 | 231.11.18.145 | 231.11.18.158 | 231.11.18.159 | 14 |
| 3 | 231.11.18.160/28 | 231.11.18.160 | 231.11.18.161 | 231.11.18.174 | 231.11.18.175 | 14 |
| 4 | 231.11.18.176/28 | 231.11.18.176 | 231.11.18.177 | 231.11.18.190 | 231.11.18.191 | 14 |
| 5 | 231.11.18.192/28 | 231.11.18.192 | 231.11.18.193 | 231.11.18.206 | 231.11.18.207 | 14 |
| 6 | 231.11.18.208/28 | 231.11.18.208 | 231.11.18.209 | 231.11.18.222 | 231.11.18.223 | 14 |
| 7 | 231.11.18.224/28 | 231.11.18.224 | 231.11.18.225 | 231.11.18.238 | 231.11.18.239 | 14 |
| 8 | 231.11.18.240/28 | 231.11.18.240 | 231.11.18.241 | 231.11.18.254 | 231.11.18.255 | 14 |
Split 231.11.18.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 231.11.18.128/29 | 231.11.18.128 | 231.11.18.129 | 231.11.18.134 | 231.11.18.135 | 6 |
| 2 | 231.11.18.136/29 | 231.11.18.136 | 231.11.18.137 | 231.11.18.142 | 231.11.18.143 | 6 |
| 3 | 231.11.18.144/29 | 231.11.18.144 | 231.11.18.145 | 231.11.18.150 | 231.11.18.151 | 6 |
| 4 | 231.11.18.152/29 | 231.11.18.152 | 231.11.18.153 | 231.11.18.158 | 231.11.18.159 | 6 |
| 5 | 231.11.18.160/29 | 231.11.18.160 | 231.11.18.161 | 231.11.18.166 | 231.11.18.167 | 6 |
| 6 | 231.11.18.168/29 | 231.11.18.168 | 231.11.18.169 | 231.11.18.174 | 231.11.18.175 | 6 |
| 7 | 231.11.18.176/29 | 231.11.18.176 | 231.11.18.177 | 231.11.18.182 | 231.11.18.183 | 6 |
| 8 | 231.11.18.184/29 | 231.11.18.184 | 231.11.18.185 | 231.11.18.190 | 231.11.18.191 | 6 |
| 9 | 231.11.18.192/29 | 231.11.18.192 | 231.11.18.193 | 231.11.18.198 | 231.11.18.199 | 6 |
| 10 | 231.11.18.200/29 | 231.11.18.200 | 231.11.18.201 | 231.11.18.206 | 231.11.18.207 | 6 |
| 11 | 231.11.18.208/29 | 231.11.18.208 | 231.11.18.209 | 231.11.18.214 | 231.11.18.215 | 6 |
| 12 | 231.11.18.216/29 | 231.11.18.216 | 231.11.18.217 | 231.11.18.222 | 231.11.18.223 | 6 |
| 13 | 231.11.18.224/29 | 231.11.18.224 | 231.11.18.225 | 231.11.18.230 | 231.11.18.231 | 6 |
| 14 | 231.11.18.232/29 | 231.11.18.232 | 231.11.18.233 | 231.11.18.238 | 231.11.18.239 | 6 |
| 15 | 231.11.18.240/29 | 231.11.18.240 | 231.11.18.241 | 231.11.18.246 | 231.11.18.247 | 6 |
| 16 | 231.11.18.248/29 | 231.11.18.248 | 231.11.18.249 | 231.11.18.254 | 231.11.18.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.