151.148.4.0/23
PublicClass B — /23 prefix — 510 usable hosts
Network address — the base address of the block (151.148.4.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 151.148.5.255 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 | 151.148.4.0/23 |
| Network Address | 151.148.4.0 |
| Broadcast Address | 151.148.5.255 |
| 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 | 151.148.4.1 |
| Last Usable IP | 151.148.5.254 |
| Network (Hex) | 0x97940400 |
| Broadcast (Hex) | 0x979405FF |
| 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.
Subnet Breakdown — splitting into /24
This /23 block can be divided into 2 /24 subnets.
| CIDR | Network | Broadcast | First Usable | Last Usable | Hosts |
|---|---|---|---|---|---|
| 151.148.4.0/24 | 151.148.4.0 | 151.148.4.255 | 151.148.4.1 | 151.148.4.254 | 254 |
| 151.148.5.0/24 | 151.148.5.0 | 151.148.5.255 | 151.148.5.1 | 151.148.5.254 | 254 |