Sendori and DNS

There has recently been some interest in Sendori, a web service that offers content filtering and Domain Name System (DNS) services. This can be a useful service for home computers or personal devices, but it is inappropriate for use on our business network.

In no particular order, the top reasons to think twice before using Sendori:

  • Sendori is redundant. Davenport already employs content filtering to protect users on our network. We also contribute information to several global projects that protect internet users worldwide.
  • Sendori degrades performance for some sites. Davenport utilizes a private local network, with many resources not exposed to the internet. We run our own DNS services locally that provide name resolution for both local resources and internet resources. Sendori handles requests for internet resources only and cannot handle requests for local resources, introducing at best a delay and at worst a loss of service for local resource lookups. As an example when visiting, Sendori would return our public address ( while our local DNS service returns the local address (192.168.x.x); the local address is faster and more reliable when accessing on campus.
  • Sendori decreases your privacy. The DNS service you choose to use can learn a great deal of information about your browsing habits and interests. The first time you visit any website there will be a DNS lookup to resolve the website name into a numerical service address. A DNS service provider could record the incoming requests and learn a good deal about your browsing habits. At Davenport, we utilize central DNS servers that handle all requests to avoid passing more information than necessary to DNS service providers. That means the when using our central DNS servers it is very difficult for any external company to tie DNS lookups to a specific individual and gather data on them. Utilizing the Sendori service allows a record of every domain visited to be gathered for a certain individual. Sendori’s privacy policy allows them to store data for 18 months and utilize cookies and pixel tags for data collection.

Fortunately, Sendori is easy to remove, simply uninstall Sendori through Add or Remove Programs in the control panel.


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