Relevant RFC on A records for NS's

[Scott Haneda]

Someone pointed me to this http://thednsreport.com/?domain=isc.org
I am not a huge fan of these checking tools, this one has me curious.

My domain of course has the same error, which is a little comforting,  
sine I am in good company :)

What is this error asking of me, they are wanting in my case, A  
records for NS's?  I am pretty sure I have those, as does isc.org.

ns-ext.nrt1.isc.org.	3600	IN	A	192.228.90.19

So what in the world is this tool reporting?
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