Worked on the mapcidr repository to generalize CIDR-based IP filtering for the -fi option, enabling support for arbitrary CIDR ranges beyond the default configuration. Developed a new helper function to convert CIDR inputs into network objects and integrated this logic with the existing RemoveCIDRs workflow, enhancing the flexibility and accuracy of IP address management. Addressed a bug where the filter-ip flag did not correctly process CIDR inputs, adding validation to ensure only valid notations were handled. Utilized Go and networking concepts to improve filtering reliability, reducing false positives and negatives for production deployments requiring precise access control.