North American Network Operators Group
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Re: Fixing .com DNS glue records - who to contact?

  • From: Todd Vierling
  • Date: Wed Aug 17 04:54:16 2005 
On Tue, 16 Aug 2005, Jim Popovitch wrote:

>  $host 64.164.28.194
>   194.28.164.64.in-addr.arpa is an alias for  \
>      194.192.28.164.64.in-addr.arpa.
>   194.192.28.164.64.in-addr.arpa domain name pointer ns.nextbus.com.
>
> Is "194.192.28.164.64.in-addr.arpa" valid?

Should be -- this is standard practice for rDNS delegation when the rDNS
responsible entity is not using an even octet-bounded network (/8, /16, or
/24).  In this case, it indicates a subnet of /27 or /26 (as the network
boundary *seems* to be .192, though that's just thanks to the naming
convention used by the upstream, and the customer in question has .200 as
well).

-- 
-- Todd Vierling <[email protected]> <[email protected]> <[email protected]>