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Re:Enabling IPv6 support for IPv4-only apps on Linux by g232089 on Wednesday October 04, 2023 @04:06AM (#37762240)
It's an RFC6052 address.
Re:Enabling IPv6 support for IPv4-only apps on Linux by usr1106 on Wednesday October 04, 2023 @04:27AM (#37762410)
Thanks for the pointer. Actually RFC6052 just refers to RFC4291 from 2006 in this case. And that simply calls it an alternative representation.

Edit: RFC1884 from 1995 already had it, nothing has changed in that aspect.