Code: https://github.com/tumi8/ECSplorer

ECSplorer implements the response-aware approach as presented in the paper ECSeptional DNS Data: Evaluating Nameserver ECS Deployments with Response-Aware Scanning. ECSplorer is a parallelized DNS ECS scanner written in Go. It can be used to obtain a full address space view of DNS load-balanced responses. The scanner also supports IPv6 with prefix-length-based limits to complete such a scan within a reasonable time.