Hesam Naroozpour

In 2009, big demonstrations rocked Iran.

And after, cybersecurity researchers say Iran's leaders started looking at ways to centralize the country's internet infrastructure, creating just a few state-controlled gateways that manage international internet traffic.

Here's Hesam Naroozpour.

He's a researcher who once advised the Iranian government.

Poor says Iran also created crude domestic internet platforms walled off from the global internet.

And so nearly four weeks on, Iran's internet is still closed off.

Emily Fang and Pierre News.