Where can a realtime map showing all flights and all dangerous areas be found?
Actually what constitutes a "perilous zone" is arbitrarily decided by countries or airlines . Ergo, there are no zones that have been defined by the International Civil Aviation Organization as perilous .

http://www.icao.int/Pages/default.aspx

For example as on this date British Airways and Qantas  have demarcated Ukrainian airspace as dangerous and is therefore avoiding it .

As far as a realtime map of flights are concerned who may take a look at Flightradar24

http://www.flightradar24.com/20,77/7