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A comment on I spent a week without IPv4 (2023). Parent comment

Re:I spent a week without IPv4 (2023) by clashandcarry on Saturday December 20, 2025 @02:15PM (#46338729)
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.

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Re:I spent a week without IPv4 (2023) by rockskon on Saturday December 20, 2025 @03:08PM (#46339138)
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.

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Re:I spent a week without IPv4 (2023) by tpetry on Saturday December 20, 2025 @03:11PM (#46339168)
That exactly what was the question about and they explained why it is invalid…
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