Gulzhan Erghalieva, the chief editor of the website -- guljan.org -- said that the Almaty court gave no reasons for the suspension.
Last month, prosecutors requested that two opposition groups and dozens of opposition media outlets be designated as extremist.
Activities of the unregistered opposition Algha (Forward) party and at least three media outlets have been suspended since then.
Algha leader Vladimir Kozlov was sentenced to 7 1/2 years in prison in October for his role in a mass strike by oil workers in the western town of Zhanaozen that ended in violence in December 2011.
Opposition activists say Koslov's prosecution was politically motivated.
The banned media outlets extensively covered Koslov's trial and the events in Zhanaozen.