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	<title>Sebastiaan Neuteboom &#8211; Noise</title>
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		<title>What came first: the CNAME or the A record?</title>
		<link>https://noise.getoto.net/2026/01/14/what-came-first-the-cname-or-the-a-record/</link>
		
		<dc:creator><![CDATA[Sebastiaan Neuteboom]]></dc:creator>
		<pubDate>Wed, 14 Jan 2026 00:00:00 +0000</pubDate>
				<category><![CDATA[1.1.1.1]]></category>
		<category><![CDATA[Bugs]]></category>
		<category><![CDATA[Consumer Services]]></category>
		<category><![CDATA[DNS]]></category>
		<category><![CDATA[Post Mortem]]></category>
		<category><![CDATA[Resolver]]></category>
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					<description><![CDATA[A recent change to 1.1.1.1 accidentally altered the order of CNAME records in DNS responses, breaking resolution for some clients. This post explores the technical root cause, examines the source code of affected resolvers, and dives into the inherent ambiguities of the DNS RFCs.]]></description>
		
		
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