Detailed information about IPv4 /32 subnets
A /32 CIDR refers to a single host address. It's used when specifying a single IP address rather than a range.
| CIDR Notation | /32 |
| Subnet Mask | 255.255.255.255 |
| Binary Subnet Mask | 11111111 11111111 11111111 11111111 |
| Total Addresses | 1 |
| Usable Hosts (Standard) | 0 |
| AWS Usable IPs | 0 |
| Azure Usable IPs | 0 |
| GCP Usable IPs | 0 |
A CIDR /32 subnet has 0 usable IP addresses for hosts. This is a relatively small subnet suitable for specific network segments.
Smaller subnets like this help improve network security and reduce broadcast domain size.
Cloud providers reserve some IP addresses in each subnet for internal use, resulting in fewer usable IPs:
When planning your cloud infrastructure, consider these reserved addresses to accurately size your subnets.