64.252.144.0/21
PublicClass A — /21 prefix — 2,046 usable hosts
Network address — the base address of the block (64.252.144.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 64.252.151.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 2,046 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.248.0 is the dotted-decimal equivalent of /21. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 64.252.144.0/21 |
| Network Address | 64.252.144.0 |
| Broadcast Address | 64.252.151.255 |
| Subnet Mask | 255.255.248.0 |
| Wildcard Mask | 0.0.7.255 |
| Prefix Length | /21 |
| IP Address Class | Class A |
| Total IP Addresses | 2,048 |
| Usable Host Addresses | 2,046 |
| First Usable IP | 64.252.144.1 |
| Last Usable IP | 64.252.151.254 |
| Network (Hex) | 0x40FC9000 |
| Broadcast (Hex) | 0x40FC97FF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 21 bits (1s in the mask) identify the network. The remaining 11 bits identify hosts within the network.
Split into Equal Subnets
Split 64.252.144.0/21 into 2 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.252.144.0/22 | 64.252.144.0 | 64.252.144.1 | 64.252.147.254 | 64.252.147.255 | 1,022 |
| 2 | 64.252.148.0/22 | 64.252.148.0 | 64.252.148.1 | 64.252.151.254 | 64.252.151.255 | 1,022 |
Split 64.252.144.0/21 into 4 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.252.144.0/23 | 64.252.144.0 | 64.252.144.1 | 64.252.145.254 | 64.252.145.255 | 510 |
| 2 | 64.252.146.0/23 | 64.252.146.0 | 64.252.146.1 | 64.252.147.254 | 64.252.147.255 | 510 |
| 3 | 64.252.148.0/23 | 64.252.148.0 | 64.252.148.1 | 64.252.149.254 | 64.252.149.255 | 510 |
| 4 | 64.252.150.0/23 | 64.252.150.0 | 64.252.150.1 | 64.252.151.254 | 64.252.151.255 | 510 |
Split 64.252.144.0/21 into 8 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.252.144.0/24 | 64.252.144.0 | 64.252.144.1 | 64.252.144.254 | 64.252.144.255 | 254 |
| 2 | 64.252.145.0/24 | 64.252.145.0 | 64.252.145.1 | 64.252.145.254 | 64.252.145.255 | 254 |
| 3 | 64.252.146.0/24 | 64.252.146.0 | 64.252.146.1 | 64.252.146.254 | 64.252.146.255 | 254 |
| 4 | 64.252.147.0/24 | 64.252.147.0 | 64.252.147.1 | 64.252.147.254 | 64.252.147.255 | 254 |
| 5 | 64.252.148.0/24 | 64.252.148.0 | 64.252.148.1 | 64.252.148.254 | 64.252.148.255 | 254 |
| 6 | 64.252.149.0/24 | 64.252.149.0 | 64.252.149.1 | 64.252.149.254 | 64.252.149.255 | 254 |
| 7 | 64.252.150.0/24 | 64.252.150.0 | 64.252.150.1 | 64.252.150.254 | 64.252.150.255 | 254 |
| 8 | 64.252.151.0/24 | 64.252.151.0 | 64.252.151.1 | 64.252.151.254 | 64.252.151.255 | 254 |
Split 64.252.144.0/21 into 16 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 64.252.144.0/25 | 64.252.144.0 | 64.252.144.1 | 64.252.144.126 | 64.252.144.127 | 126 |
| 2 | 64.252.144.128/25 | 64.252.144.128 | 64.252.144.129 | 64.252.144.254 | 64.252.144.255 | 126 |
| 3 | 64.252.145.0/25 | 64.252.145.0 | 64.252.145.1 | 64.252.145.126 | 64.252.145.127 | 126 |
| 4 | 64.252.145.128/25 | 64.252.145.128 | 64.252.145.129 | 64.252.145.254 | 64.252.145.255 | 126 |
| 5 | 64.252.146.0/25 | 64.252.146.0 | 64.252.146.1 | 64.252.146.126 | 64.252.146.127 | 126 |
| 6 | 64.252.146.128/25 | 64.252.146.128 | 64.252.146.129 | 64.252.146.254 | 64.252.146.255 | 126 |
| 7 | 64.252.147.0/25 | 64.252.147.0 | 64.252.147.1 | 64.252.147.126 | 64.252.147.127 | 126 |
| 8 | 64.252.147.128/25 | 64.252.147.128 | 64.252.147.129 | 64.252.147.254 | 64.252.147.255 | 126 |
| 9 | 64.252.148.0/25 | 64.252.148.0 | 64.252.148.1 | 64.252.148.126 | 64.252.148.127 | 126 |
| 10 | 64.252.148.128/25 | 64.252.148.128 | 64.252.148.129 | 64.252.148.254 | 64.252.148.255 | 126 |
| 11 | 64.252.149.0/25 | 64.252.149.0 | 64.252.149.1 | 64.252.149.126 | 64.252.149.127 | 126 |
| 12 | 64.252.149.128/25 | 64.252.149.128 | 64.252.149.129 | 64.252.149.254 | 64.252.149.255 | 126 |
| 13 | 64.252.150.0/25 | 64.252.150.0 | 64.252.150.1 | 64.252.150.126 | 64.252.150.127 | 126 |
| 14 | 64.252.150.128/25 | 64.252.150.128 | 64.252.150.129 | 64.252.150.254 | 64.252.150.255 | 126 |
| 15 | 64.252.151.0/25 | 64.252.151.0 | 64.252.151.1 | 64.252.151.126 | 64.252.151.127 | 126 |
| 16 | 64.252.151.128/25 | 64.252.151.128 | 64.252.151.129 | 64.252.151.254 | 64.252.151.255 | 126 |