February 7, 2016. Difficulty rose by +20.06% to 144.12B from 120.03B.
Change
+20.06%
New difficulty
144.12B
Period length
11.7 days
Network hashrate then (7-day)
1.1 EH/s
Bitcoin price then
$375
Hashprice then
$1,283/PH/day
The 2,016 blocks before it took 11.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 20.06%: one of the largest adjustments on record. For every machine on the network that is a pay cut of the same size until the next retarget.