10.0.21.224/27
Private (RFC 1918) RFC 1918Class A — /27 prefix — 30 usable hosts
Network address — the base address of the block (10.0.21.224). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 10.0.21.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 30 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.224 is the dotted-decimal equivalent of /27. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 10.0.21.224/27 |
| Network Address | 10.0.21.224 |
| Broadcast Address | 10.0.21.255 |
| Subnet Mask | 255.255.255.224 |
| Wildcard Mask | 0.0.0.31 |
| Prefix Length | /27 |
| IP Address Class | Class A |
| Total IP Addresses | 32 |
| Usable Host Addresses | 30 |
| First Usable IP | 10.0.21.225 |
| Last Usable IP | 10.0.21.254 |
| Network (Hex) | 0x0A0015E0 |
| Broadcast (Hex) | 0x0A0015FF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
Binary Representation
The first 27 bits (1s in the mask) identify the network. The remaining 5 bits identify hosts within the network.
Subnet Breakdown — splitting into /28
This /27 block can be divided into 2 /28 subnets.
| CIDR | Network | Broadcast | First Usable | Last Usable | Hosts |
|---|---|---|---|---|---|
| 10.0.21.224/28 | 10.0.21.224 | 10.0.21.239 | 10.0.21.225 | 10.0.21.238 | 14 |
| 10.0.21.240/28 | 10.0.21.240 | 10.0.21.255 | 10.0.21.241 | 10.0.21.254 | 14 |
IP Address Sample
Showing first 16 of 32 total IPs.