87.0.64.0/19
PublicClass A — /19 prefix — 8,190 usable hosts
Network address — the base address of the block (87.0.64.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 87.0.95.255 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 | 87.0.64.0/19 |
| Network Address | 87.0.64.0 |
| Broadcast Address | 87.0.95.255 |
| 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 | 87.0.64.1 |
| Last Usable IP | 87.0.95.254 |
| Network (Hex) | 0x57004000 |
| Broadcast (Hex) | 0x57005FFF |
| 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 87.0.64.0/19 into 2 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 87.0.64.0/20 | 87.0.64.0 | 87.0.64.1 | 87.0.79.254 | 87.0.79.255 | 4,094 |
| 2 | 87.0.80.0/20 | 87.0.80.0 | 87.0.80.1 | 87.0.95.254 | 87.0.95.255 | 4,094 |
Split 87.0.64.0/19 into 4 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 87.0.64.0/21 | 87.0.64.0 | 87.0.64.1 | 87.0.71.254 | 87.0.71.255 | 2,046 |
| 2 | 87.0.72.0/21 | 87.0.72.0 | 87.0.72.1 | 87.0.79.254 | 87.0.79.255 | 2,046 |
| 3 | 87.0.80.0/21 | 87.0.80.0 | 87.0.80.1 | 87.0.87.254 | 87.0.87.255 | 2,046 |
| 4 | 87.0.88.0/21 | 87.0.88.0 | 87.0.88.1 | 87.0.95.254 | 87.0.95.255 | 2,046 |
Split 87.0.64.0/19 into 8 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 87.0.64.0/22 | 87.0.64.0 | 87.0.64.1 | 87.0.67.254 | 87.0.67.255 | 1,022 |
| 2 | 87.0.68.0/22 | 87.0.68.0 | 87.0.68.1 | 87.0.71.254 | 87.0.71.255 | 1,022 |
| 3 | 87.0.72.0/22 | 87.0.72.0 | 87.0.72.1 | 87.0.75.254 | 87.0.75.255 | 1,022 |
| 4 | 87.0.76.0/22 | 87.0.76.0 | 87.0.76.1 | 87.0.79.254 | 87.0.79.255 | 1,022 |
| 5 | 87.0.80.0/22 | 87.0.80.0 | 87.0.80.1 | 87.0.83.254 | 87.0.83.255 | 1,022 |
| 6 | 87.0.84.0/22 | 87.0.84.0 | 87.0.84.1 | 87.0.87.254 | 87.0.87.255 | 1,022 |
| 7 | 87.0.88.0/22 | 87.0.88.0 | 87.0.88.1 | 87.0.91.254 | 87.0.91.255 | 1,022 |
| 8 | 87.0.92.0/22 | 87.0.92.0 | 87.0.92.1 | 87.0.95.254 | 87.0.95.255 | 1,022 |
Split 87.0.64.0/19 into 16 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 87.0.64.0/23 | 87.0.64.0 | 87.0.64.1 | 87.0.65.254 | 87.0.65.255 | 510 |
| 2 | 87.0.66.0/23 | 87.0.66.0 | 87.0.66.1 | 87.0.67.254 | 87.0.67.255 | 510 |
| 3 | 87.0.68.0/23 | 87.0.68.0 | 87.0.68.1 | 87.0.69.254 | 87.0.69.255 | 510 |
| 4 | 87.0.70.0/23 | 87.0.70.0 | 87.0.70.1 | 87.0.71.254 | 87.0.71.255 | 510 |
| 5 | 87.0.72.0/23 | 87.0.72.0 | 87.0.72.1 | 87.0.73.254 | 87.0.73.255 | 510 |
| 6 | 87.0.74.0/23 | 87.0.74.0 | 87.0.74.1 | 87.0.75.254 | 87.0.75.255 | 510 |
| 7 | 87.0.76.0/23 | 87.0.76.0 | 87.0.76.1 | 87.0.77.254 | 87.0.77.255 | 510 |
| 8 | 87.0.78.0/23 | 87.0.78.0 | 87.0.78.1 | 87.0.79.254 | 87.0.79.255 | 510 |
| 9 | 87.0.80.0/23 | 87.0.80.0 | 87.0.80.1 | 87.0.81.254 | 87.0.81.255 | 510 |
| 10 | 87.0.82.0/23 | 87.0.82.0 | 87.0.82.1 | 87.0.83.254 | 87.0.83.255 | 510 |
| 11 | 87.0.84.0/23 | 87.0.84.0 | 87.0.84.1 | 87.0.85.254 | 87.0.85.255 | 510 |
| 12 | 87.0.86.0/23 | 87.0.86.0 | 87.0.86.1 | 87.0.87.254 | 87.0.87.255 | 510 |
| 13 | 87.0.88.0/23 | 87.0.88.0 | 87.0.88.1 | 87.0.89.254 | 87.0.89.255 | 510 |
| 14 | 87.0.90.0/23 | 87.0.90.0 | 87.0.90.1 | 87.0.91.254 | 87.0.91.255 | 510 |
| 15 | 87.0.92.0/23 | 87.0.92.0 | 87.0.92.1 | 87.0.93.254 | 87.0.93.255 | 510 |
| 16 | 87.0.94.0/23 | 87.0.94.0 | 87.0.94.1 | 87.0.95.254 | 87.0.95.255 | 510 |