4 ms·

2000:1::1 would expand to 2000:0001:0000:0000:0000:0000:0000:0001 2000::1::1 could be 2000:0000:0000:0000:0001:0000:0000:001, or 2000:00000000:0001:0000:0000:0

2000:1::1 would expand to 2000:0001:0000:0000:0000:0000:0000:0001 2000::1::1 could be 2000:0000:0000:0000:0001:0000:0000:001, or 2000:00000000:0001:0000:0000:0000:001 There's ambiguity on where to fill in the five groups of 0000 in the second case.

rockskon 10mo ago
The second address is invalid. You can only use :: once per address. Edit: Whoops. Didn't read what the above post was in response to. My bad.
- tpetry 10mo ago
  That exactly what was the question about and they explained why it is invalid…