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The IANA DNS parameters for this appear to have an error then too:
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65001-65534</td>
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Reserved for Local/Experimental Use</td>
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[<a href="http://www.iana.org/go/rfc6891">RFC6891</a>]</td>
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65535</td>
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Reserved for future expansion</td>
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[<a href="http://www.iana.org/go/rfc6891">RFC6891</a>]<br>
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<div>On Nov 26, 2013, at 10:00 AM, Ray Bellis <<a href="mailto:Ray.Bellis@nominet.org.uk">Ray.Bellis@nominet.org.uk</a>> wrote:</div>
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<div>On 26 Nov 2013, at 14:52, I wrote:</div>
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<div>12-bit, surely?</div>
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<div>§6.1.3, RFC 6891:</div>
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<pre class="newpage" style="font-size: 1em; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">EXTENDED-RCODE
Forms the upper 8 bits of extended 12-bit RCODE (together with the
4 bits defined in [<a href="http://tools.ietf.org/html/rfc1035" title=""Domain names - implementation and specification"">RFC1035</a>]. Note that EXTENDED-RCODE value 0
indicates that an unextended RCODE is in use (values 0 through
15).</pre>
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<div>[I think the 32-bits you're referring to relate to the fact that this field is packed into what's usually the 32-bit TTL field].</div>
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<div>But following up to myself, there's no need to support 12 bits here if the other four bits are provided by the "non-EDNS" API.</div>
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<div>Ray</div>
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