Close, you need 8 sets of hex numbers in each group of four, but basically, you got the idea. 1000.0000.0000.0000.0000.0000.0000.0001 drops down to 1000::1. Remember that the double colons represent the 0000 only, and you can't drop trailing zeros, only leading zeroes. (You have to keep the 1000 but can drop the zeroes in 0001.)
Courtney