217.2.64.0/20
PublicClass C — /20 prefix — 4,094 usable hosts
Network address — the base address of the block (217.2.64.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 217.2.79.255 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 | 217.2.64.0/20 |
| Network Address | 217.2.64.0 |
| Broadcast Address | 217.2.79.255 |
| Subnet Mask | 255.255.240.0 |
| Wildcard Mask | 0.0.15.255 |
| Prefix Length | /20 |
| IP Address Class | Class C |
| Total IP Addresses | 4,096 |
| Usable Host Addresses | 4,094 |
| First Usable IP | 217.2.64.1 |
| Last Usable IP | 217.2.79.254 |
| Network (Hex) | 0xD9024000 |
| Broadcast (Hex) | 0xD9024FFF |
| 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 217.2.64.0/20 into 2 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 217.2.64.0/21 | 217.2.64.0 | 217.2.64.1 | 217.2.71.254 | 217.2.71.255 | 2,046 |
| 2 | 217.2.72.0/21 | 217.2.72.0 | 217.2.72.1 | 217.2.79.254 | 217.2.79.255 | 2,046 |
Split 217.2.64.0/20 into 4 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 217.2.64.0/22 | 217.2.64.0 | 217.2.64.1 | 217.2.67.254 | 217.2.67.255 | 1,022 |
| 2 | 217.2.68.0/22 | 217.2.68.0 | 217.2.68.1 | 217.2.71.254 | 217.2.71.255 | 1,022 |
| 3 | 217.2.72.0/22 | 217.2.72.0 | 217.2.72.1 | 217.2.75.254 | 217.2.75.255 | 1,022 |
| 4 | 217.2.76.0/22 | 217.2.76.0 | 217.2.76.1 | 217.2.79.254 | 217.2.79.255 | 1,022 |
Split 217.2.64.0/20 into 8 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 217.2.64.0/23 | 217.2.64.0 | 217.2.64.1 | 217.2.65.254 | 217.2.65.255 | 510 |
| 2 | 217.2.66.0/23 | 217.2.66.0 | 217.2.66.1 | 217.2.67.254 | 217.2.67.255 | 510 |
| 3 | 217.2.68.0/23 | 217.2.68.0 | 217.2.68.1 | 217.2.69.254 | 217.2.69.255 | 510 |
| 4 | 217.2.70.0/23 | 217.2.70.0 | 217.2.70.1 | 217.2.71.254 | 217.2.71.255 | 510 |
| 5 | 217.2.72.0/23 | 217.2.72.0 | 217.2.72.1 | 217.2.73.254 | 217.2.73.255 | 510 |
| 6 | 217.2.74.0/23 | 217.2.74.0 | 217.2.74.1 | 217.2.75.254 | 217.2.75.255 | 510 |
| 7 | 217.2.76.0/23 | 217.2.76.0 | 217.2.76.1 | 217.2.77.254 | 217.2.77.255 | 510 |
| 8 | 217.2.78.0/23 | 217.2.78.0 | 217.2.78.1 | 217.2.79.254 | 217.2.79.255 | 510 |
Split 217.2.64.0/20 into 16 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 217.2.64.0/24 | 217.2.64.0 | 217.2.64.1 | 217.2.64.254 | 217.2.64.255 | 254 |
| 2 | 217.2.65.0/24 | 217.2.65.0 | 217.2.65.1 | 217.2.65.254 | 217.2.65.255 | 254 |
| 3 | 217.2.66.0/24 | 217.2.66.0 | 217.2.66.1 | 217.2.66.254 | 217.2.66.255 | 254 |
| 4 | 217.2.67.0/24 | 217.2.67.0 | 217.2.67.1 | 217.2.67.254 | 217.2.67.255 | 254 |
| 5 | 217.2.68.0/24 | 217.2.68.0 | 217.2.68.1 | 217.2.68.254 | 217.2.68.255 | 254 |
| 6 | 217.2.69.0/24 | 217.2.69.0 | 217.2.69.1 | 217.2.69.254 | 217.2.69.255 | 254 |
| 7 | 217.2.70.0/24 | 217.2.70.0 | 217.2.70.1 | 217.2.70.254 | 217.2.70.255 | 254 |
| 8 | 217.2.71.0/24 | 217.2.71.0 | 217.2.71.1 | 217.2.71.254 | 217.2.71.255 | 254 |
| 9 | 217.2.72.0/24 | 217.2.72.0 | 217.2.72.1 | 217.2.72.254 | 217.2.72.255 | 254 |
| 10 | 217.2.73.0/24 | 217.2.73.0 | 217.2.73.1 | 217.2.73.254 | 217.2.73.255 | 254 |
| 11 | 217.2.74.0/24 | 217.2.74.0 | 217.2.74.1 | 217.2.74.254 | 217.2.74.255 | 254 |
| 12 | 217.2.75.0/24 | 217.2.75.0 | 217.2.75.1 | 217.2.75.254 | 217.2.75.255 | 254 |
| 13 | 217.2.76.0/24 | 217.2.76.0 | 217.2.76.1 | 217.2.76.254 | 217.2.76.255 | 254 |
| 14 | 217.2.77.0/24 | 217.2.77.0 | 217.2.77.1 | 217.2.77.254 | 217.2.77.255 | 254 |
| 15 | 217.2.78.0/24 | 217.2.78.0 | 217.2.78.1 | 217.2.78.254 | 217.2.78.255 | 254 |
| 16 | 217.2.79.0/24 | 217.2.79.0 | 217.2.79.1 | 217.2.79.254 | 217.2.79.255 | 254 |