February 4, 2017. Difficulty rose by +7.43% to 422.17B from 392.96B.
Change
+7.43%
New difficulty
422.17B
Period length
13.0 days
Network hashrate then (7-day)
3.1 EH/s
Bitcoin price then
$997
Hashprice then
$585/PH/day
The 2,016 blocks before it took 13.0 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 7.43%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.