IPv4 Compatible IPv6

What this IPv6 address-format interview question tests

This is an easy networking question that checks whether you understand IPv6 address notation and how IPv4 addresses embed within the IPv6 address space. It is the kind of foundational knowledge firms expect from candidates working on network infrastructure, low-latency systems, or protocol-level optimization.

To answer questions like this, you need to parse IPv6 hexadecimal notation, recognize the special format used for IPv4-compatible addresses, and convert between hex and dotted-decimal notation. The question rewards familiarity with the IPv6 specification rather than deep algorithmic reasoning.

• IPv6 address syntax and zero-compression rules
• IPv4-mapped and IPv4-compatible address formats
• Hexadecimal to decimal conversion
• Address representation standards in TCP/IP Illustrated and RFC 4291