131.9.166.0/23
PublicClass B — /23 prefix — 510 usable hosts
Network address — the base address of the block (131.9.166.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 131.9.167.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 510 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.254.0 is the dotted-decimal equivalent of /23. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 131.9.166.0/23 |
| Network Address | 131.9.166.0 |
| Broadcast Address | 131.9.167.255 |
| Subnet Mask | 255.255.254.0 |
| Wildcard Mask | 0.0.1.255 |
| Prefix Length | /23 |
| IP Address Class | Class B |
| Total IP Addresses | 512 |
| Usable Host Addresses | 510 |
| First Usable IP | 131.9.166.1 |
| Last Usable IP | 131.9.167.254 |
| Network (Hex) | 0x8309A600 |
| Broadcast (Hex) | 0x8309A7FF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 23 bits (1s in the mask) identify the network. The remaining 9 bits identify hosts within the network.
Split into Equal Subnets
Split 131.9.166.0/23 into 2 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.9.166.0/24 | 131.9.166.0 | 131.9.166.1 | 131.9.166.254 | 131.9.166.255 | 254 |
| 2 | 131.9.167.0/24 | 131.9.167.0 | 131.9.167.1 | 131.9.167.254 | 131.9.167.255 | 254 |
Split 131.9.166.0/23 into 4 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.9.166.0/25 | 131.9.166.0 | 131.9.166.1 | 131.9.166.126 | 131.9.166.127 | 126 |
| 2 | 131.9.166.128/25 | 131.9.166.128 | 131.9.166.129 | 131.9.166.254 | 131.9.166.255 | 126 |
| 3 | 131.9.167.0/25 | 131.9.167.0 | 131.9.167.1 | 131.9.167.126 | 131.9.167.127 | 126 |
| 4 | 131.9.167.128/25 | 131.9.167.128 | 131.9.167.129 | 131.9.167.254 | 131.9.167.255 | 126 |
Split 131.9.166.0/23 into 8 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.9.166.0/26 | 131.9.166.0 | 131.9.166.1 | 131.9.166.62 | 131.9.166.63 | 62 |
| 2 | 131.9.166.64/26 | 131.9.166.64 | 131.9.166.65 | 131.9.166.126 | 131.9.166.127 | 62 |
| 3 | 131.9.166.128/26 | 131.9.166.128 | 131.9.166.129 | 131.9.166.190 | 131.9.166.191 | 62 |
| 4 | 131.9.166.192/26 | 131.9.166.192 | 131.9.166.193 | 131.9.166.254 | 131.9.166.255 | 62 |
| 5 | 131.9.167.0/26 | 131.9.167.0 | 131.9.167.1 | 131.9.167.62 | 131.9.167.63 | 62 |
| 6 | 131.9.167.64/26 | 131.9.167.64 | 131.9.167.65 | 131.9.167.126 | 131.9.167.127 | 62 |
| 7 | 131.9.167.128/26 | 131.9.167.128 | 131.9.167.129 | 131.9.167.190 | 131.9.167.191 | 62 |
| 8 | 131.9.167.192/26 | 131.9.167.192 | 131.9.167.193 | 131.9.167.254 | 131.9.167.255 | 62 |
Split 131.9.166.0/23 into 16 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 131.9.166.0/27 | 131.9.166.0 | 131.9.166.1 | 131.9.166.30 | 131.9.166.31 | 30 |
| 2 | 131.9.166.32/27 | 131.9.166.32 | 131.9.166.33 | 131.9.166.62 | 131.9.166.63 | 30 |
| 3 | 131.9.166.64/27 | 131.9.166.64 | 131.9.166.65 | 131.9.166.94 | 131.9.166.95 | 30 |
| 4 | 131.9.166.96/27 | 131.9.166.96 | 131.9.166.97 | 131.9.166.126 | 131.9.166.127 | 30 |
| 5 | 131.9.166.128/27 | 131.9.166.128 | 131.9.166.129 | 131.9.166.158 | 131.9.166.159 | 30 |
| 6 | 131.9.166.160/27 | 131.9.166.160 | 131.9.166.161 | 131.9.166.190 | 131.9.166.191 | 30 |
| 7 | 131.9.166.192/27 | 131.9.166.192 | 131.9.166.193 | 131.9.166.222 | 131.9.166.223 | 30 |
| 8 | 131.9.166.224/27 | 131.9.166.224 | 131.9.166.225 | 131.9.166.254 | 131.9.166.255 | 30 |
| 9 | 131.9.167.0/27 | 131.9.167.0 | 131.9.167.1 | 131.9.167.30 | 131.9.167.31 | 30 |
| 10 | 131.9.167.32/27 | 131.9.167.32 | 131.9.167.33 | 131.9.167.62 | 131.9.167.63 | 30 |
| 11 | 131.9.167.64/27 | 131.9.167.64 | 131.9.167.65 | 131.9.167.94 | 131.9.167.95 | 30 |
| 12 | 131.9.167.96/27 | 131.9.167.96 | 131.9.167.97 | 131.9.167.126 | 131.9.167.127 | 30 |
| 13 | 131.9.167.128/27 | 131.9.167.128 | 131.9.167.129 | 131.9.167.158 | 131.9.167.159 | 30 |
| 14 | 131.9.167.160/27 | 131.9.167.160 | 131.9.167.161 | 131.9.167.190 | 131.9.167.191 | 30 |
| 15 | 131.9.167.192/27 | 131.9.167.192 | 131.9.167.193 | 131.9.167.222 | 131.9.167.223 | 30 |
| 16 | 131.9.167.224/27 | 131.9.167.224 | 131.9.167.225 | 131.9.167.254 | 131.9.167.255 | 30 |