151.8.32.0/20
PublicClass B — /20 prefix — 4,094 usable hosts
Network address — the base address of the block (151.8.32.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 151.8.47.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 4,094 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.240.0 is the dotted-decimal equivalent of /20. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 151.8.32.0/20 |
| Network Address | 151.8.32.0 |
| Broadcast Address | 151.8.47.255 |
| Subnet Mask | 255.255.240.0 |
| Wildcard Mask | 0.0.15.255 |
| Prefix Length | /20 |
| IP Address Class | Class B |
| Total IP Addresses | 4,096 |
| Usable Host Addresses | 4,094 |
| First Usable IP | 151.8.32.1 |
| Last Usable IP | 151.8.47.254 |
| Network (Hex) | 0x97082000 |
| Broadcast (Hex) | 0x97082FFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 20 bits (1s in the mask) identify the network. The remaining 12 bits identify hosts within the network.
Split into Equal Subnets
Split 151.8.32.0/20 into 2 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.8.32.0/21 | 151.8.32.0 | 151.8.32.1 | 151.8.39.254 | 151.8.39.255 | 2,046 |
| 2 | 151.8.40.0/21 | 151.8.40.0 | 151.8.40.1 | 151.8.47.254 | 151.8.47.255 | 2,046 |
Split 151.8.32.0/20 into 4 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.8.32.0/22 | 151.8.32.0 | 151.8.32.1 | 151.8.35.254 | 151.8.35.255 | 1,022 |
| 2 | 151.8.36.0/22 | 151.8.36.0 | 151.8.36.1 | 151.8.39.254 | 151.8.39.255 | 1,022 |
| 3 | 151.8.40.0/22 | 151.8.40.0 | 151.8.40.1 | 151.8.43.254 | 151.8.43.255 | 1,022 |
| 4 | 151.8.44.0/22 | 151.8.44.0 | 151.8.44.1 | 151.8.47.254 | 151.8.47.255 | 1,022 |
Split 151.8.32.0/20 into 8 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.8.32.0/23 | 151.8.32.0 | 151.8.32.1 | 151.8.33.254 | 151.8.33.255 | 510 |
| 2 | 151.8.34.0/23 | 151.8.34.0 | 151.8.34.1 | 151.8.35.254 | 151.8.35.255 | 510 |
| 3 | 151.8.36.0/23 | 151.8.36.0 | 151.8.36.1 | 151.8.37.254 | 151.8.37.255 | 510 |
| 4 | 151.8.38.0/23 | 151.8.38.0 | 151.8.38.1 | 151.8.39.254 | 151.8.39.255 | 510 |
| 5 | 151.8.40.0/23 | 151.8.40.0 | 151.8.40.1 | 151.8.41.254 | 151.8.41.255 | 510 |
| 6 | 151.8.42.0/23 | 151.8.42.0 | 151.8.42.1 | 151.8.43.254 | 151.8.43.255 | 510 |
| 7 | 151.8.44.0/23 | 151.8.44.0 | 151.8.44.1 | 151.8.45.254 | 151.8.45.255 | 510 |
| 8 | 151.8.46.0/23 | 151.8.46.0 | 151.8.46.1 | 151.8.47.254 | 151.8.47.255 | 510 |
Split 151.8.32.0/20 into 16 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 151.8.32.0/24 | 151.8.32.0 | 151.8.32.1 | 151.8.32.254 | 151.8.32.255 | 254 |
| 2 | 151.8.33.0/24 | 151.8.33.0 | 151.8.33.1 | 151.8.33.254 | 151.8.33.255 | 254 |
| 3 | 151.8.34.0/24 | 151.8.34.0 | 151.8.34.1 | 151.8.34.254 | 151.8.34.255 | 254 |
| 4 | 151.8.35.0/24 | 151.8.35.0 | 151.8.35.1 | 151.8.35.254 | 151.8.35.255 | 254 |
| 5 | 151.8.36.0/24 | 151.8.36.0 | 151.8.36.1 | 151.8.36.254 | 151.8.36.255 | 254 |
| 6 | 151.8.37.0/24 | 151.8.37.0 | 151.8.37.1 | 151.8.37.254 | 151.8.37.255 | 254 |
| 7 | 151.8.38.0/24 | 151.8.38.0 | 151.8.38.1 | 151.8.38.254 | 151.8.38.255 | 254 |
| 8 | 151.8.39.0/24 | 151.8.39.0 | 151.8.39.1 | 151.8.39.254 | 151.8.39.255 | 254 |
| 9 | 151.8.40.0/24 | 151.8.40.0 | 151.8.40.1 | 151.8.40.254 | 151.8.40.255 | 254 |
| 10 | 151.8.41.0/24 | 151.8.41.0 | 151.8.41.1 | 151.8.41.254 | 151.8.41.255 | 254 |
| 11 | 151.8.42.0/24 | 151.8.42.0 | 151.8.42.1 | 151.8.42.254 | 151.8.42.255 | 254 |
| 12 | 151.8.43.0/24 | 151.8.43.0 | 151.8.43.1 | 151.8.43.254 | 151.8.43.255 | 254 |
| 13 | 151.8.44.0/24 | 151.8.44.0 | 151.8.44.1 | 151.8.44.254 | 151.8.44.255 | 254 |
| 14 | 151.8.45.0/24 | 151.8.45.0 | 151.8.45.1 | 151.8.45.254 | 151.8.45.255 | 254 |
| 15 | 151.8.46.0/24 | 151.8.46.0 | 151.8.46.1 | 151.8.46.254 | 151.8.46.255 | 254 |
| 16 | 151.8.47.0/24 | 151.8.47.0 | 151.8.47.1 | 151.8.47.254 | 151.8.47.255 | 254 |