Tehran, Jan. 21 -- More than 300 hours have passed since Iran implemented its nationwide internet blackout, leaving the country in a near-total digital void, in what is perhaps the country's longest internet blackout, as the massive public unrest grinds on. The Islamic Republic is using every tool to restrict the flow of information and digitally disconnect Iranians from the outside world.

According to internet monitoring group NetBlocks, the restrictions were designed specifically to keep most Iranians offline while allowing extremely access through an array of tightly "whitelisted" networks.

"Attempts to obscure the truth will be documented in real time: the world is watching," the group said, warning that the blackout now exceeds the d...