[SURBL-Discuss] Re: URI BL responses, always loopback network?

Jeff Chan jeffc at surbl.org
Tue Aug 5 12:22:50 CEST 2008

On Monday, July 28, 2008, 8:17:38 PM, Ron Guerin wrote:
> Frank Ellermann wrote:
>> Ron Guerin wrote:
>>> what I wanted to know was if anyone knows of a BL or URI BL that 
>>> returns or plans on returning something other than a loopback
>>> address as a positive response to a lookup?
>> None I'm aware of, but you said to  It's
>> in fact the complete 127/8 range to

> I gathered that even though I'm unaware of anyone presently going beyond
> 0.0.255, that there was a good chance someone would eventually, which is
> why I decided to check only for a value starting with the four 
> characters of 127.

>> There is a draft to get this on "standards track", finally, see
>> <http://tools.ietf.org/html/draft-irtf-asrg-dnsbl>

> Oh, good! Thanks for the pointer.  And it's written by John Levine,
> which I find reassuring.  It does appear that testing for "127." is
> about the best I can do with this.

Draft documents notwithstanding, in actual practice most
blacklists use only the fourth octet.  A few vary the second and
third octets, but they are exceptional.

Jeff C.

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