  Tor and i2p networks are two of the most popular darknets. Both darknets have
become an area of illegal activities highlighting the necessity to study and
analyze them to identify and report illegal content to Law Enforcement Agencies
(LEAs). This paper analyzes the connections between the Tor network and the i2p
network. We created the first dataset that combines information from Tor and
i2p networks. The dataset contains more than 49k darknet services. The process
of building and analyzing the dataset shows that it is not possible to explore
one of the networks without considering the other. Both networks work as an
ecosystem and there are clear paths between them. Using graph analysis, we also
identified the most relevant domains, the prominent types of services in each
network, and their relations. Findings are relevant to LEAs and researchers
aiming to crawl and investigate i2p and Tor networks.
