Detailed information about IPv4 /8 subnets
A /8 network (Class A) is an extremely large network with over 16 million hosts. These are typically used by very large organizations or allocated to regional internet registries.
| CIDR Notation | /8 |
| Subnet Mask | 255.0.0.0 |
| Binary Subnet Mask | 11111111 00000000 00000000 00000000 |
| Total Addresses | 16,777,216 |
| Usable Hosts (Standard) | 16,777,214 |
| AWS Usable IPs | 16,777,209 |
| Azure Usable IPs | 16,777,209 |
| GCP Usable IPs | 16,777,210 |
A CIDR /8 subnet has 16,777,214 usable IP addresses for hosts. This is a relatively large subnet that can be further divided into smaller subnets if needed.
Organizations typically use subnets of this size for large-scale deployments or when planning for future growth.
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.