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About
The website offers a comprehensive CIDR calculator and subnet mask cheat sheet designed for network engineers and administrators. It provides detailed reference materials, including CIDR notation, subnet masks, IP address counts, and wildcard masks, crucial for managing network boundaries and host capacities. The tool suite includes a VLSM (Variable-Length Subnet Mask) calculator, an IPv4 to IPv6 converter, and an IP lookup tool to find public IP addresses. This resource aids in quick subnet calculations, IP address translations, and understanding network configurations. The site also covers legacy IPv4 classful addressing for historical reference and compatibility with older systems. Additionally, it provides information on private IP ranges as defined by RFC 1918, and includes resources for correctly using CIDR in network design. This cheat sheet helps network professionals optimize address allocation and streamline network troubleshooting.
Problem & solution
Problem
Need quick, accurate subnet/CIDR details for IP planning and troubleshooting.
Solution
Provides CIDR lookup table plus VLSM, IP check, and address converters.
Who it's for
Network engineers and network administrators working with IP addressing.
Main features
- CIDR/subnet reference table
- VLSM calculator
- What is my IP tool
- IPv4↔IPv6 converters
- MAC↔IPv6 converters
Use cases
- Lookup hosts for a CIDR prefix
- Convert IPv4/IPv6 or MAC forms
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