Usually the looking glass for each tier 1 provider will give you a good idea I can see http://lookingglass.level3.net/ is down now. http://www.bgp4.as/looking-glasses
Usually the looking glass for each tier 1 provider will give you a good idea I can see http://lookingglass.level3.net/ is down now. http://www.bgp4.as/looking-glasses