172.28.224.0/20
Private (RFC 1918) RFC 1918Class B — /20 prefix — 4,094 usable hosts
Network address — the base address of the block (172.28.224.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 172.28.239.255 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 | 172.28.224.0/20 |
| Network Address | 172.28.224.0 |
| Broadcast Address | 172.28.239.255 |
| 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 | 172.28.224.1 |
| Last Usable IP | 172.28.239.254 |
| Network (Hex) | 0xAC1CE000 |
| Broadcast (Hex) | 0xAC1CEFFF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
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 172.28.224.0/20 into 2 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.28.224.0/21 | 172.28.224.0 | 172.28.224.1 | 172.28.231.254 | 172.28.231.255 | 2,046 |
| 2 | 172.28.232.0/21 | 172.28.232.0 | 172.28.232.1 | 172.28.239.254 | 172.28.239.255 | 2,046 |
Split 172.28.224.0/20 into 4 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.28.224.0/22 | 172.28.224.0 | 172.28.224.1 | 172.28.227.254 | 172.28.227.255 | 1,022 |
| 2 | 172.28.228.0/22 | 172.28.228.0 | 172.28.228.1 | 172.28.231.254 | 172.28.231.255 | 1,022 |
| 3 | 172.28.232.0/22 | 172.28.232.0 | 172.28.232.1 | 172.28.235.254 | 172.28.235.255 | 1,022 |
| 4 | 172.28.236.0/22 | 172.28.236.0 | 172.28.236.1 | 172.28.239.254 | 172.28.239.255 | 1,022 |
Split 172.28.224.0/20 into 8 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.28.224.0/23 | 172.28.224.0 | 172.28.224.1 | 172.28.225.254 | 172.28.225.255 | 510 |
| 2 | 172.28.226.0/23 | 172.28.226.0 | 172.28.226.1 | 172.28.227.254 | 172.28.227.255 | 510 |
| 3 | 172.28.228.0/23 | 172.28.228.0 | 172.28.228.1 | 172.28.229.254 | 172.28.229.255 | 510 |
| 4 | 172.28.230.0/23 | 172.28.230.0 | 172.28.230.1 | 172.28.231.254 | 172.28.231.255 | 510 |
| 5 | 172.28.232.0/23 | 172.28.232.0 | 172.28.232.1 | 172.28.233.254 | 172.28.233.255 | 510 |
| 6 | 172.28.234.0/23 | 172.28.234.0 | 172.28.234.1 | 172.28.235.254 | 172.28.235.255 | 510 |
| 7 | 172.28.236.0/23 | 172.28.236.0 | 172.28.236.1 | 172.28.237.254 | 172.28.237.255 | 510 |
| 8 | 172.28.238.0/23 | 172.28.238.0 | 172.28.238.1 | 172.28.239.254 | 172.28.239.255 | 510 |
Split 172.28.224.0/20 into 16 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.28.224.0/24 | 172.28.224.0 | 172.28.224.1 | 172.28.224.254 | 172.28.224.255 | 254 |
| 2 | 172.28.225.0/24 | 172.28.225.0 | 172.28.225.1 | 172.28.225.254 | 172.28.225.255 | 254 |
| 3 | 172.28.226.0/24 | 172.28.226.0 | 172.28.226.1 | 172.28.226.254 | 172.28.226.255 | 254 |
| 4 | 172.28.227.0/24 | 172.28.227.0 | 172.28.227.1 | 172.28.227.254 | 172.28.227.255 | 254 |
| 5 | 172.28.228.0/24 | 172.28.228.0 | 172.28.228.1 | 172.28.228.254 | 172.28.228.255 | 254 |
| 6 | 172.28.229.0/24 | 172.28.229.0 | 172.28.229.1 | 172.28.229.254 | 172.28.229.255 | 254 |
| 7 | 172.28.230.0/24 | 172.28.230.0 | 172.28.230.1 | 172.28.230.254 | 172.28.230.255 | 254 |
| 8 | 172.28.231.0/24 | 172.28.231.0 | 172.28.231.1 | 172.28.231.254 | 172.28.231.255 | 254 |
| 9 | 172.28.232.0/24 | 172.28.232.0 | 172.28.232.1 | 172.28.232.254 | 172.28.232.255 | 254 |
| 10 | 172.28.233.0/24 | 172.28.233.0 | 172.28.233.1 | 172.28.233.254 | 172.28.233.255 | 254 |
| 11 | 172.28.234.0/24 | 172.28.234.0 | 172.28.234.1 | 172.28.234.254 | 172.28.234.255 | 254 |
| 12 | 172.28.235.0/24 | 172.28.235.0 | 172.28.235.1 | 172.28.235.254 | 172.28.235.255 | 254 |
| 13 | 172.28.236.0/24 | 172.28.236.0 | 172.28.236.1 | 172.28.236.254 | 172.28.236.255 | 254 |
| 14 | 172.28.237.0/24 | 172.28.237.0 | 172.28.237.1 | 172.28.237.254 | 172.28.237.255 | 254 |
| 15 | 172.28.238.0/24 | 172.28.238.0 | 172.28.238.1 | 172.28.238.254 | 172.28.238.255 | 254 |
| 16 | 172.28.239.0/24 | 172.28.239.0 | 172.28.239.1 | 172.28.239.254 | 172.28.239.255 | 254 |