From their website…
“Hubble is a system that operates continuously to find persistent Internet black holes as they occur. Hubble has operated continuously since September 17, 2007. During that time, it identified 883,019 black holes and reachability problems. In the most recent quarter-hourly round, completed at 10:36 PDT, 04/09/2008, Hubble issued 83,476 traceroutes to 3,022 prefixes it identified as likely to be experiencing problems (of 78,772 total prefixes monitored by the system). Of these, it found 1,398 prefixes to be unreachable from all its vantage points and 1,380 to be reachable from some vantage points and not others.
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