151.7.42.0/23
PublicClass B — /23 prefix — 510 usable hosts
Network address — the base address of the block (151.7.42.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 151.7.43.255 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 | 151.7.42.0/23 |
| Network Address | 151.7.42.0 |
| Broadcast Address | 151.7.43.255 |
| 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 | 151.7.42.1 |
| Last Usable IP | 151.7.43.254 |
| Network (Hex) | 0x97072A00 |
| Broadcast (Hex) | 0x97072BFF |
| 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 151.7.42.0/23 into 2 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.7.42.0/24 | 151.7.42.0 | 151.7.42.1 | 151.7.42.254 | 151.7.42.255 | 254 |
| 2 | 151.7.43.0/24 | 151.7.43.0 | 151.7.43.1 | 151.7.43.254 | 151.7.43.255 | 254 |
Split 151.7.42.0/23 into 4 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.7.42.0/25 | 151.7.42.0 | 151.7.42.1 | 151.7.42.126 | 151.7.42.127 | 126 |
| 2 | 151.7.42.128/25 | 151.7.42.128 | 151.7.42.129 | 151.7.42.254 | 151.7.42.255 | 126 |
| 3 | 151.7.43.0/25 | 151.7.43.0 | 151.7.43.1 | 151.7.43.126 | 151.7.43.127 | 126 |
| 4 | 151.7.43.128/25 | 151.7.43.128 | 151.7.43.129 | 151.7.43.254 | 151.7.43.255 | 126 |
Split 151.7.42.0/23 into 8 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.7.42.0/26 | 151.7.42.0 | 151.7.42.1 | 151.7.42.62 | 151.7.42.63 | 62 |
| 2 | 151.7.42.64/26 | 151.7.42.64 | 151.7.42.65 | 151.7.42.126 | 151.7.42.127 | 62 |
| 3 | 151.7.42.128/26 | 151.7.42.128 | 151.7.42.129 | 151.7.42.190 | 151.7.42.191 | 62 |
| 4 | 151.7.42.192/26 | 151.7.42.192 | 151.7.42.193 | 151.7.42.254 | 151.7.42.255 | 62 |
| 5 | 151.7.43.0/26 | 151.7.43.0 | 151.7.43.1 | 151.7.43.62 | 151.7.43.63 | 62 |
| 6 | 151.7.43.64/26 | 151.7.43.64 | 151.7.43.65 | 151.7.43.126 | 151.7.43.127 | 62 |
| 7 | 151.7.43.128/26 | 151.7.43.128 | 151.7.43.129 | 151.7.43.190 | 151.7.43.191 | 62 |
| 8 | 151.7.43.192/26 | 151.7.43.192 | 151.7.43.193 | 151.7.43.254 | 151.7.43.255 | 62 |
Split 151.7.42.0/23 into 16 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.7.42.0/27 | 151.7.42.0 | 151.7.42.1 | 151.7.42.30 | 151.7.42.31 | 30 |
| 2 | 151.7.42.32/27 | 151.7.42.32 | 151.7.42.33 | 151.7.42.62 | 151.7.42.63 | 30 |
| 3 | 151.7.42.64/27 | 151.7.42.64 | 151.7.42.65 | 151.7.42.94 | 151.7.42.95 | 30 |
| 4 | 151.7.42.96/27 | 151.7.42.96 | 151.7.42.97 | 151.7.42.126 | 151.7.42.127 | 30 |
| 5 | 151.7.42.128/27 | 151.7.42.128 | 151.7.42.129 | 151.7.42.158 | 151.7.42.159 | 30 |
| 6 | 151.7.42.160/27 | 151.7.42.160 | 151.7.42.161 | 151.7.42.190 | 151.7.42.191 | 30 |
| 7 | 151.7.42.192/27 | 151.7.42.192 | 151.7.42.193 | 151.7.42.222 | 151.7.42.223 | 30 |
| 8 | 151.7.42.224/27 | 151.7.42.224 | 151.7.42.225 | 151.7.42.254 | 151.7.42.255 | 30 |
| 9 | 151.7.43.0/27 | 151.7.43.0 | 151.7.43.1 | 151.7.43.30 | 151.7.43.31 | 30 |
| 10 | 151.7.43.32/27 | 151.7.43.32 | 151.7.43.33 | 151.7.43.62 | 151.7.43.63 | 30 |
| 11 | 151.7.43.64/27 | 151.7.43.64 | 151.7.43.65 | 151.7.43.94 | 151.7.43.95 | 30 |
| 12 | 151.7.43.96/27 | 151.7.43.96 | 151.7.43.97 | 151.7.43.126 | 151.7.43.127 | 30 |
| 13 | 151.7.43.128/27 | 151.7.43.128 | 151.7.43.129 | 151.7.43.158 | 151.7.43.159 | 30 |
| 14 | 151.7.43.160/27 | 151.7.43.160 | 151.7.43.161 | 151.7.43.190 | 151.7.43.191 | 30 |
| 15 | 151.7.43.192/27 | 151.7.43.192 | 151.7.43.193 | 151.7.43.222 | 151.7.43.223 | 30 |
| 16 | 151.7.43.224/27 | 151.7.43.224 | 151.7.43.225 | 151.7.43.254 | 151.7.43.255 | 30 |