Iran's internet blackout, first imposed well over a month ago, is now the longest nationwide shutdown on record, according to the monitor NetBlocks.

"Iran's internet blackout is now the longest nation-scale internet shutdown on record in any country, exceeding all other comparable incidents in severity having entered its 37th consecutive day after 864 hours," NetBlocks said in a tweet.

In another tweet, the monitor noted some countries had experienced intermittent or regional-level shutdowns over longer periods, while North Korea had never been connected to the global internet at all.