1. AS Peering Analysis,
http://www.netconfigs.com/general/anoverview.htm
2. CAIDA Router Measurements,
http://www.caida.org/tools/taxonomy/routing.xml
3. DETER Network Security Testbed,
https://www.isi.deterlab.net
4. I2P Anonymous Network,
http://www.i2p2.de/
5. Rocketfuel: An ISP Topology Mapping Engine,
http://www.cs.washington.edu/research/networking/rocketfuel/