224.72.152.0/21
Multicast RFC 5771Class D (Multicast) — /21 prefix — 2,046 usable hosts
Network address — the base address of the block (224.72.152.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 224.72.159.255 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 | 224.72.152.0/21 |
| Network Address | 224.72.152.0 |
| Broadcast Address | 224.72.159.255 |
| Subnet Mask | 255.255.248.0 |
| Wildcard Mask | 0.0.7.255 |
| Prefix Length | /21 |
| IP Address Class | Class D (Multicast) |
| Total IP Addresses | 2,048 |
| Usable Host Addresses | 2,046 |
| First Usable IP | 224.72.152.1 |
| Last Usable IP | 224.72.159.254 |
| Network (Hex) | 0xE0489800 |
| Broadcast (Hex) | 0xE0489FFF |
| Governing RFC | RFC 5771 |
| Address Type | Multicast |
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 224.72.152.0/21 into 2 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 224.72.152.0/22 | 224.72.152.0 | 224.72.152.1 | 224.72.155.254 | 224.72.155.255 | 1,022 |
| 2 | 224.72.156.0/22 | 224.72.156.0 | 224.72.156.1 | 224.72.159.254 | 224.72.159.255 | 1,022 |
Split 224.72.152.0/21 into 4 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 224.72.152.0/23 | 224.72.152.0 | 224.72.152.1 | 224.72.153.254 | 224.72.153.255 | 510 |
| 2 | 224.72.154.0/23 | 224.72.154.0 | 224.72.154.1 | 224.72.155.254 | 224.72.155.255 | 510 |
| 3 | 224.72.156.0/23 | 224.72.156.0 | 224.72.156.1 | 224.72.157.254 | 224.72.157.255 | 510 |
| 4 | 224.72.158.0/23 | 224.72.158.0 | 224.72.158.1 | 224.72.159.254 | 224.72.159.255 | 510 |
Split 224.72.152.0/21 into 8 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 224.72.152.0/24 | 224.72.152.0 | 224.72.152.1 | 224.72.152.254 | 224.72.152.255 | 254 |
| 2 | 224.72.153.0/24 | 224.72.153.0 | 224.72.153.1 | 224.72.153.254 | 224.72.153.255 | 254 |
| 3 | 224.72.154.0/24 | 224.72.154.0 | 224.72.154.1 | 224.72.154.254 | 224.72.154.255 | 254 |
| 4 | 224.72.155.0/24 | 224.72.155.0 | 224.72.155.1 | 224.72.155.254 | 224.72.155.255 | 254 |
| 5 | 224.72.156.0/24 | 224.72.156.0 | 224.72.156.1 | 224.72.156.254 | 224.72.156.255 | 254 |
| 6 | 224.72.157.0/24 | 224.72.157.0 | 224.72.157.1 | 224.72.157.254 | 224.72.157.255 | 254 |
| 7 | 224.72.158.0/24 | 224.72.158.0 | 224.72.158.1 | 224.72.158.254 | 224.72.158.255 | 254 |
| 8 | 224.72.159.0/24 | 224.72.159.0 | 224.72.159.1 | 224.72.159.254 | 224.72.159.255 | 254 |
Split 224.72.152.0/21 into 16 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 224.72.152.0/25 | 224.72.152.0 | 224.72.152.1 | 224.72.152.126 | 224.72.152.127 | 126 |
| 2 | 224.72.152.128/25 | 224.72.152.128 | 224.72.152.129 | 224.72.152.254 | 224.72.152.255 | 126 |
| 3 | 224.72.153.0/25 | 224.72.153.0 | 224.72.153.1 | 224.72.153.126 | 224.72.153.127 | 126 |
| 4 | 224.72.153.128/25 | 224.72.153.128 | 224.72.153.129 | 224.72.153.254 | 224.72.153.255 | 126 |
| 5 | 224.72.154.0/25 | 224.72.154.0 | 224.72.154.1 | 224.72.154.126 | 224.72.154.127 | 126 |
| 6 | 224.72.154.128/25 | 224.72.154.128 | 224.72.154.129 | 224.72.154.254 | 224.72.154.255 | 126 |
| 7 | 224.72.155.0/25 | 224.72.155.0 | 224.72.155.1 | 224.72.155.126 | 224.72.155.127 | 126 |
| 8 | 224.72.155.128/25 | 224.72.155.128 | 224.72.155.129 | 224.72.155.254 | 224.72.155.255 | 126 |
| 9 | 224.72.156.0/25 | 224.72.156.0 | 224.72.156.1 | 224.72.156.126 | 224.72.156.127 | 126 |
| 10 | 224.72.156.128/25 | 224.72.156.128 | 224.72.156.129 | 224.72.156.254 | 224.72.156.255 | 126 |
| 11 | 224.72.157.0/25 | 224.72.157.0 | 224.72.157.1 | 224.72.157.126 | 224.72.157.127 | 126 |
| 12 | 224.72.157.128/25 | 224.72.157.128 | 224.72.157.129 | 224.72.157.254 | 224.72.157.255 | 126 |
| 13 | 224.72.158.0/25 | 224.72.158.0 | 224.72.158.1 | 224.72.158.126 | 224.72.158.127 | 126 |
| 14 | 224.72.158.128/25 | 224.72.158.128 | 224.72.158.129 | 224.72.158.254 | 224.72.158.255 | 126 |
| 15 | 224.72.159.0/25 | 224.72.159.0 | 224.72.159.1 | 224.72.159.126 | 224.72.159.127 | 126 |
| 16 | 224.72.159.128/25 | 224.72.159.128 | 224.72.159.129 | 224.72.159.254 | 224.72.159.255 | 126 |