18.237.121.0/27
PublicClass A — /27 prefix — 30 usable hosts
Network address — the base address of the block (18.237.121.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 18.237.121.31 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 | 18.237.121.0/27 |
| Network Address | 18.237.121.0 |
| Broadcast Address | 18.237.121.31 |
| 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 | 18.237.121.1 |
| Last Usable IP | 18.237.121.30 |
| Network (Hex) | 0x12ED7900 |
| Broadcast (Hex) | 0x12ED791F |
| Address Type | Public / Globally Routable |
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 |
|---|---|---|---|---|---|
| 18.237.121.0/28 | 18.237.121.0 | 18.237.121.15 | 18.237.121.1 | 18.237.121.14 | 14 |
| 18.237.121.16/28 | 18.237.121.16 | 18.237.121.31 | 18.237.121.17 | 18.237.121.30 | 14 |
IP Address Sample
Showing first 16 of 32 total IPs.