2001:0DB8:0000:FE01:0000:0000:00F0:0020
There are 2 rules for shortening the IPv6 Address
2001: DB8: 0:FE01:0000:0000: F0: 20
Rule 1 – Eliminate Leading Zeros
2001:DB8:0:FE01::F0:20
Rule 2 – Collapse largest contiguous Zero Block to ::