131.5.57.128/25
PublicClass B — /25 prefix — 126 usable hosts
Network address — the base address of the block (131.5.57.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 131.5.57.255 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 | 131.5.57.128/25 |
| Network Address | 131.5.57.128 |
| Broadcast Address | 131.5.57.255 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class B |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 131.5.57.129 |
| Last Usable IP | 131.5.57.254 |
| Network (Hex) | 0x83053980 |
| Broadcast (Hex) | 0x830539FF |
| Address Type | Public / Globally Routable |
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 131.5.57.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.5.57.128/26 | 131.5.57.128 | 131.5.57.129 | 131.5.57.190 | 131.5.57.191 | 62 |
| 2 | 131.5.57.192/26 | 131.5.57.192 | 131.5.57.193 | 131.5.57.254 | 131.5.57.255 | 62 |
Split 131.5.57.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.5.57.128/27 | 131.5.57.128 | 131.5.57.129 | 131.5.57.158 | 131.5.57.159 | 30 |
| 2 | 131.5.57.160/27 | 131.5.57.160 | 131.5.57.161 | 131.5.57.190 | 131.5.57.191 | 30 |
| 3 | 131.5.57.192/27 | 131.5.57.192 | 131.5.57.193 | 131.5.57.222 | 131.5.57.223 | 30 |
| 4 | 131.5.57.224/27 | 131.5.57.224 | 131.5.57.225 | 131.5.57.254 | 131.5.57.255 | 30 |
Split 131.5.57.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.5.57.128/28 | 131.5.57.128 | 131.5.57.129 | 131.5.57.142 | 131.5.57.143 | 14 |
| 2 | 131.5.57.144/28 | 131.5.57.144 | 131.5.57.145 | 131.5.57.158 | 131.5.57.159 | 14 |
| 3 | 131.5.57.160/28 | 131.5.57.160 | 131.5.57.161 | 131.5.57.174 | 131.5.57.175 | 14 |
| 4 | 131.5.57.176/28 | 131.5.57.176 | 131.5.57.177 | 131.5.57.190 | 131.5.57.191 | 14 |
| 5 | 131.5.57.192/28 | 131.5.57.192 | 131.5.57.193 | 131.5.57.206 | 131.5.57.207 | 14 |
| 6 | 131.5.57.208/28 | 131.5.57.208 | 131.5.57.209 | 131.5.57.222 | 131.5.57.223 | 14 |
| 7 | 131.5.57.224/28 | 131.5.57.224 | 131.5.57.225 | 131.5.57.238 | 131.5.57.239 | 14 |
| 8 | 131.5.57.240/28 | 131.5.57.240 | 131.5.57.241 | 131.5.57.254 | 131.5.57.255 | 14 |
Split 131.5.57.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.5.57.128/29 | 131.5.57.128 | 131.5.57.129 | 131.5.57.134 | 131.5.57.135 | 6 |
| 2 | 131.5.57.136/29 | 131.5.57.136 | 131.5.57.137 | 131.5.57.142 | 131.5.57.143 | 6 |
| 3 | 131.5.57.144/29 | 131.5.57.144 | 131.5.57.145 | 131.5.57.150 | 131.5.57.151 | 6 |
| 4 | 131.5.57.152/29 | 131.5.57.152 | 131.5.57.153 | 131.5.57.158 | 131.5.57.159 | 6 |
| 5 | 131.5.57.160/29 | 131.5.57.160 | 131.5.57.161 | 131.5.57.166 | 131.5.57.167 | 6 |
| 6 | 131.5.57.168/29 | 131.5.57.168 | 131.5.57.169 | 131.5.57.174 | 131.5.57.175 | 6 |
| 7 | 131.5.57.176/29 | 131.5.57.176 | 131.5.57.177 | 131.5.57.182 | 131.5.57.183 | 6 |
| 8 | 131.5.57.184/29 | 131.5.57.184 | 131.5.57.185 | 131.5.57.190 | 131.5.57.191 | 6 |
| 9 | 131.5.57.192/29 | 131.5.57.192 | 131.5.57.193 | 131.5.57.198 | 131.5.57.199 | 6 |
| 10 | 131.5.57.200/29 | 131.5.57.200 | 131.5.57.201 | 131.5.57.206 | 131.5.57.207 | 6 |
| 11 | 131.5.57.208/29 | 131.5.57.208 | 131.5.57.209 | 131.5.57.214 | 131.5.57.215 | 6 |
| 12 | 131.5.57.216/29 | 131.5.57.216 | 131.5.57.217 | 131.5.57.222 | 131.5.57.223 | 6 |
| 13 | 131.5.57.224/29 | 131.5.57.224 | 131.5.57.225 | 131.5.57.230 | 131.5.57.231 | 6 |
| 14 | 131.5.57.232/29 | 131.5.57.232 | 131.5.57.233 | 131.5.57.238 | 131.5.57.239 | 6 |
| 15 | 131.5.57.240/29 | 131.5.57.240 | 131.5.57.241 | 131.5.57.246 | 131.5.57.247 | 6 |
| 16 | 131.5.57.248/29 | 131.5.57.248 | 131.5.57.249 | 131.5.57.254 | 131.5.57.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.