Worked on the jellyfin/jellyfin repository to enhance the Network Utility by improving how negated IP addresses, specifically those prefixed with an exclamation mark, are parsed and processed. Addressed an edge case where negated IPs without a subnet mask were not handled correctly, thereby increasing the reliability of network configuration workflows. The solution involved updating the C# parsing logic and introducing comprehensive unit tests to ensure robust regression coverage. By focusing on network programming and thorough test validation, the changes reduced the risk of misaddressed traffic and provided a more dependable foundation for future modifications to network-related features.