21.33.32.0/19
PublicClass A — /19 prefix — 8,190 usable hosts
Network address — the base address of the block (21.33.32.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 21.33.63.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 8,190 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.224.0 is the dotted-decimal equivalent of /19. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 21.33.32.0/19 |
| Network Address | 21.33.32.0 |
| Broadcast Address | 21.33.63.255 |
| Subnet Mask | 255.255.224.0 |
| Wildcard Mask | 0.0.31.255 |
| Prefix Length | /19 |
| IP Address Class | Class A |
| Total IP Addresses | 8,192 |
| Usable Host Addresses | 8,190 |
| First Usable IP | 21.33.32.1 |
| Last Usable IP | 21.33.63.254 |
| Network (Hex) | 0x15212000 |
| Broadcast (Hex) | 0x15213FFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 19 bits (1s in the mask) identify the network. The remaining 13 bits identify hosts within the network.
Split into Equal Subnets
Split 21.33.32.0/19 into 2 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.33.32.0/20 | 21.33.32.0 | 21.33.32.1 | 21.33.47.254 | 21.33.47.255 | 4,094 |
| 2 | 21.33.48.0/20 | 21.33.48.0 | 21.33.48.1 | 21.33.63.254 | 21.33.63.255 | 4,094 |
Split 21.33.32.0/19 into 4 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.33.32.0/21 | 21.33.32.0 | 21.33.32.1 | 21.33.39.254 | 21.33.39.255 | 2,046 |
| 2 | 21.33.40.0/21 | 21.33.40.0 | 21.33.40.1 | 21.33.47.254 | 21.33.47.255 | 2,046 |
| 3 | 21.33.48.0/21 | 21.33.48.0 | 21.33.48.1 | 21.33.55.254 | 21.33.55.255 | 2,046 |
| 4 | 21.33.56.0/21 | 21.33.56.0 | 21.33.56.1 | 21.33.63.254 | 21.33.63.255 | 2,046 |
Split 21.33.32.0/19 into 8 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.33.32.0/22 | 21.33.32.0 | 21.33.32.1 | 21.33.35.254 | 21.33.35.255 | 1,022 |
| 2 | 21.33.36.0/22 | 21.33.36.0 | 21.33.36.1 | 21.33.39.254 | 21.33.39.255 | 1,022 |
| 3 | 21.33.40.0/22 | 21.33.40.0 | 21.33.40.1 | 21.33.43.254 | 21.33.43.255 | 1,022 |
| 4 | 21.33.44.0/22 | 21.33.44.0 | 21.33.44.1 | 21.33.47.254 | 21.33.47.255 | 1,022 |
| 5 | 21.33.48.0/22 | 21.33.48.0 | 21.33.48.1 | 21.33.51.254 | 21.33.51.255 | 1,022 |
| 6 | 21.33.52.0/22 | 21.33.52.0 | 21.33.52.1 | 21.33.55.254 | 21.33.55.255 | 1,022 |
| 7 | 21.33.56.0/22 | 21.33.56.0 | 21.33.56.1 | 21.33.59.254 | 21.33.59.255 | 1,022 |
| 8 | 21.33.60.0/22 | 21.33.60.0 | 21.33.60.1 | 21.33.63.254 | 21.33.63.255 | 1,022 |
Split 21.33.32.0/19 into 16 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.33.32.0/23 | 21.33.32.0 | 21.33.32.1 | 21.33.33.254 | 21.33.33.255 | 510 |
| 2 | 21.33.34.0/23 | 21.33.34.0 | 21.33.34.1 | 21.33.35.254 | 21.33.35.255 | 510 |
| 3 | 21.33.36.0/23 | 21.33.36.0 | 21.33.36.1 | 21.33.37.254 | 21.33.37.255 | 510 |
| 4 | 21.33.38.0/23 | 21.33.38.0 | 21.33.38.1 | 21.33.39.254 | 21.33.39.255 | 510 |
| 5 | 21.33.40.0/23 | 21.33.40.0 | 21.33.40.1 | 21.33.41.254 | 21.33.41.255 | 510 |
| 6 | 21.33.42.0/23 | 21.33.42.0 | 21.33.42.1 | 21.33.43.254 | 21.33.43.255 | 510 |
| 7 | 21.33.44.0/23 | 21.33.44.0 | 21.33.44.1 | 21.33.45.254 | 21.33.45.255 | 510 |
| 8 | 21.33.46.0/23 | 21.33.46.0 | 21.33.46.1 | 21.33.47.254 | 21.33.47.255 | 510 |
| 9 | 21.33.48.0/23 | 21.33.48.0 | 21.33.48.1 | 21.33.49.254 | 21.33.49.255 | 510 |
| 10 | 21.33.50.0/23 | 21.33.50.0 | 21.33.50.1 | 21.33.51.254 | 21.33.51.255 | 510 |
| 11 | 21.33.52.0/23 | 21.33.52.0 | 21.33.52.1 | 21.33.53.254 | 21.33.53.255 | 510 |
| 12 | 21.33.54.0/23 | 21.33.54.0 | 21.33.54.1 | 21.33.55.254 | 21.33.55.255 | 510 |
| 13 | 21.33.56.0/23 | 21.33.56.0 | 21.33.56.1 | 21.33.57.254 | 21.33.57.255 | 510 |
| 14 | 21.33.58.0/23 | 21.33.58.0 | 21.33.58.1 | 21.33.59.254 | 21.33.59.255 | 510 |
| 15 | 21.33.60.0/23 | 21.33.60.0 | 21.33.60.1 | 21.33.61.254 | 21.33.61.255 | 510 |
| 16 | 21.33.62.0/23 | 21.33.62.0 | 21.33.62.1 | 21.33.63.254 | 21.33.63.255 | 510 |