Yarrp: Yelling at Random Routers Progressively

 https://www.cmand.org/yarrp/

Yarrp is a active network topology discovery tool. It's goal is to identify router interfaces and interconnections on internet scale. Conceptually this is similar to running many traceroutes and stiching them together into one view. However, traceroutes are designed to understand the connection between two hosts and do not scale easily.