Carlos Rodriguez Fernandez modernized IP address handling in the hashcat/hashcat repository by replacing the deprecated inet_ntoa function with inet_ntop, aligning the codebase with current networking standards. This update improved compatibility with both IPv4 and IPv6, ensuring more robust and future-proof address parsing. Working in C and leveraging network programming expertise, Carlos eliminated reliance on legacy APIs, which reduces maintenance risks and potential runtime issues across platforms. The work focused on a single feature, demonstrating depth in understanding cross-platform networking challenges and careful attention to long-term code reliability. No bugs were fixed during this period, reflecting a targeted engineering effort.