go-verfploeter is an anycast measurement service as described in the Verfploeter paper by Wouter de Vries at the University of Twente.
Wouter B. de Vries, Ricardo de O. Schmidt, Wes Hardaker, John Heidemann, Pieter-Tjerk de Boer and Aiko Pras 2017. Verfploeter: Broad and Load-Aware Anycast Mapping. Proceedings of the ACM Internet Measurement Conference (London, UK, 2017), 477–488. https://doi.org/10.1145/3131365.3131371