RFC 5952, "A Recommendation for IPv6 Address Text Representation", August 2010

Errata ID: 4985
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Julian de Prado
Date Reported: 2017-03-31
Rejected by: Erik Kline
Date Rejected: 2025-09-04

Section 2.2 says:

In cases where there is more than one field of only zeros, there is a
choice of how many fields can be shortened.

2001:db8:0:0:0::1
2001:db8:0:0::1
2001:db8:0::1
2001:db8::1

It should say:

In cases where there is more than one field of only zeros,there is a
choice of how many fields can be shortened, but must be shortened to 
its maximum capability.

2001:db8:0:0:0::1 is NOT acceptable
2001:db8:0:0::1 is NOT acceptable
2001:db8:0::1 is NOT acceptable
2001:db8::1 is CORRECT

Notes:

Applying section 4.2.1
--VERIFIER NOTES--
--- ek@ ---

Section 2.2 is, as part of Section 2, listing "Examples of flexibility". There is nothing prescriptive in any of these sections and, as noted, section 4.2.* is where the recommendations are made.

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