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There are a number of DNS Looking Glass sites around the Internet that will allow anyone to send a DNS query from that location. Looking Glasses are of particular use in the case of troubleshooting a problem with a DNS zone that is served from an anycasted service. In the event of a problem with the service, the view of a zone can be very different from distant places on the Internet. Here is a list of some of the known looking glass sites around the Internet: