[geeks] DNS Blacklist

[Greg A. Woods]

[ On Wednesday, May 22, 2002 at 10:52:48 (-0400), s at avoidant.org wrote: ]
> Subject: [geeks] DNS Blacklist
>
> I've seen/heard tell of a blacklist (like ORBS or RBL) that's done
> through DNS lookups. Standard DNS server, but instead of serving name
> records, it serves blacklist records.

I'm not sure what you're thinking about.....

All DNS blacklists I've ever seen are based on very standard DNS records.
All the mailer code and tools I've personally implemented to use such
blacklists do so by simply making normal standard DNS queries.

ORBS, ORDB, SpamCOP BL, etc., etc., and all the MAPS DNS-based
blacklists all work serving normal DNS records.  Mail servers and other
tools that access these blacklists simply do normal standard every-day
DNS queries to do so.  For example:

$ host -a 50.75.34.216.relays.osirusoft.com
50.75.34.216.relays.osirusoft.com       A       127.0.0.6
50.75.34.216.relays.osirusoft.com       A       127.0.0.4
50.75.34.216.relays.osirusoft.com       TXT     "http://www.spamhaus.org/SBL/sbl.lasso?query=SBX476"
50.75.34.216.relays.osirusoft.com       TXT     "[1] ombramarketing, see http://spews.org/ask.cgi?S590"


A well maintained list of DNS blacklists can be found here:

	http://www.declude.com/junkmail/support/ip4r.htm

-- 
								Greg A. Woods

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