> Is probably that recursion is turned off for those nameservers and
> the inverse mapping for  205.188.157.0 is somewhere else (on
> some other nameservers), which is where nslookup hits the brick.

Thanks, I'll buy this answer...

My guess is that the inverse mapping is at:

    dns-01.ns.aol.com      152.163.159.232
    dns-02.ns.aol.com      205.188.157.232

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