Subnet Mask Cheat Sheet
A comprehensive technical reference tool for network engineers working with IPv4 subnetting. This resource provides a complete CIDR lookup table with subnet masks, IP address counts, wildcard masks, and hex values for all prefixes from /0 to /32.
Key Features
- Complete subnet reference table with CIDR notation, subnet masks, and address counts
- Calculation logic for total IPs and usable hosts
- Private IP ranges (RFC 1918) reference
- Common subnet mask quick reference
- Detailed explanations of CIDR, wildcard masks, and IPv4 address classes
- Information about /31 exception for point-to-point links
- FAQ section covering common subnetting questions
Use Cases
- Network design and planning
- Subnet calculations for routing and switching
- IP address management
- Network troubleshooting
- Educational reference for networking students
- Quick lookup for ACL and routing protocol configurations
This tool serves as an essential reference for network administrators, engineers, and IT professionals who need to quickly identify network boundaries, calculate host capacities, and perform subnet-related tasks.
