|
CSE Home |
About Us |
Search |
Contact Info |
Having trouble accessing a favorite Web site? Perhaps the site was taken
offline, or the computer hosting it is down for maintenance.
However, the cause could be something more mysterious. At any given moment, a
portion of Internet traffic ends up being routed into information
"black holes." These are situations where
advertised paths
exist to the destination, but messages - a request to visit a Web site, an
outgoing e-mail - get lost along the way.
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 1,971,375 black holes and reachability problems. In the most recent quarter-hourly round, completed at 14:32 PDT, 07/30/2009, Hubble issued 6,111 traceroutes to 247 prefixes it identified as likely to be experiencing problems (of 78,772 total prefixes monitored by the system). Of these, it found 66 prefixes to be unreachable from all its vantage points and 71 to be reachable from some vantage points and not others.
Hubble is not updating at this time as we need to replace some
hardware. We are sorry for the inconvenience and appreciate your interest.
Please check back for updates later in the month.
Below the following map, you'll find instructions
on interpreting and navigating this page. You can go
here
for a more detailed description of the Hubble academic research
project and its goals.
Below, you can look up
Hubble's current view of the reachability of the address of your
choice.
Feel free to send suggestions and other feedback to
hubble-support.
|
|||||||
In the future, we plan to expand this page to publish
Hubble's
real-time classifications of the problems
and more of its raw data. This page includes GeoLite data created by MaxMind, available from
http://www.maxmind.com/.
|
Computer Science & Engineering University of Washington Box 352350 Seattle, WA 98195-2350 (206) 543-1695 voice, (206) 543-2969 FAX [comments to hubble-support] | |