> Can someone explain why it's ambiguous?
Because you don’t know how many zeroes are on each side around the 0001 in the middle.
It can be 2000:0000:1:0000:0000:0000:0000:1 or 2000:0000:0000:0000:0000:1:0000:1 etc.
This shortcut system of ipv6 only makes it worse. It's too hard to remember how it works.
This shortcut system of ipv6 only makes it worse. It's too hard to remember how it works.