Google has warned that a forthcoming UN-organised conference threatens the "free and open internet".
Government representatives are set to agree a new information and communications treaty in December.
It has been claimed some countries will try to wrest oversight of the net's technical specifications and domain name system from US bodies to an international organisation.
However, the UN has said there would be consensus before any change was agreed.
Google has asked web users to add their name to an online petition to support its view.
"The [UN agency] International Telecommunication Union (ITU) is bringing together regulators from around the world to renegotiate a decades-old communications treaty," it wrote on its Take Action site.
"Some proposals could permit governments to censor legitimate speech - or even allow them to cut off internet access.
Source: BBC News
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