[Asrg] For DNSBLs, embedded IPv4 in IPv6

[Chris Lewis]

John Levine wrote:
>> However, there are a few DNSBLs that return machine-readable in the TXT. 
>>  Eg: routeviews.
> 
> I think routeviews is great, but I wouldn't really call it a DNSBL.

DNS-Based-List.  The BCP claims it is.  Sorta.
> 
> Are there any DNSBLs which give yes/no answers wth TXT records rather
> than A records?

SA treats text record returns from some DNSBLs as being listed.  Or at 
least the version I looked at did.  But that doesn't really count.

Can't think of any at the moment.