[Asrg] For DNSBLs, embedded IPv4 in IPv6

[Douglas Otis]

On Aug 4, 2008, at 3:56 PM, Douglas Otis wrote:
>>
>> I don't know anyone who thinks that a DNSBL should return anything  
>> other than A and TXT records.  What leads you to believe otherwise?
>
> Agreed.  Keep answers to A and TXT records.  Just different names  
> are being questioned.  A records provide 4095 different values which  
> seems more that adequate.  Internally, we are using 16 bits filtered  
> against customer preferences.  When memory becomes limited, TXT  
> records seem the first items dropped from the answer.

Sorry, this was just considering our internal use.  We expose some  
bits to customers, and others are masked for internal sub-categories.   
The overall range of an A record, where the upper octet is 127 and the  
value 127.0.0.1 is avoided, would be 16,777,214.  Many customers base  
acceptance on whether no answer and no error is returned, and then  
never examine the content of the A record.

-Doug