September 25, 2016. Difficulty rose by +6.82% to 241.23B from 225.83B.
Change
+6.82%
New difficulty
241.23B
Period length
13.1 days
Network hashrate then (7-day)
1.7 EH/s
Bitcoin price then
$599
Hashprice then
$677/PH/day
The 2,016 blocks before it took 13.1 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 6.82%: a large adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.