This document discusses ENISA's 2013 Internet Mapping Project. The project aims to map critical internet infrastructure sectors in Europe like banking, energy, logistics and health. It will initially focus on the IP routing layer and explore sharing baseline data with CERTs under non-disclosure agreements. The goals are to provide guidance on assessing national internet infrastructure resilience and recommendations to enhance resilience across Europe. The document seeks feedback on relevant data sources, what is needed to understand national interconnections and collaboration during incidents. Examples of mapping tools are shown and comments are invited.