The anti spam community has a pretty good handle on the IPv4 bank. What will IPv6 do to all our collective experience? All those new places to hide will have to be mapped out all over again!I've been thinking a lot about that. The neat thing is that IPv6 already exists and is being used, although few people know it. There could be spammers already using IPv6, but if so, they can only send to other servers using IPv6 (if they send to IPv4 servers, the mail will come from a "gateway" IP). So as soon as the first spammers starts using IPv6, a new standard can be developed for DNS-based lookups (there is already a format for IPv6 reverse DNS lookups, so the IPv6 spam lookups would likely mimic those, as they currently mimic the IPv4 lookups).
We've already got some IPv6 tools at http://www.DNSstuff.com -- see http://www.dnsstuff.com/tools/tracert.ch?ip=%3Ans3.nic.fr for an IPv6 tracert, http://www.dnsstuff.com/tools/ptr.ch?ip=2001%3A798%3A0%3A2%3A0%3A0%3A0%3A1 for an IPv6 reverse DNS lookup, even http://www.dnsstuff.com/tools/whois.ch?ip=2001%3A798%3A0%3A2%3A0%3A0%3A0%3A1 for an IPv6WHOIS lookup, http://www.dnsstuff.com/tools/lookup.ch?name=%3Ans3.nic.fr&type=AAAA for an IPv6 DNS lookup, and http://www.dnsstuff.com/tools/ping.ch?ip=%3Ans3.nic.fr for IPv6 ping. :)
By the time spammers can realistically use IPv6 (likely at least a few years from now), the anti-spam community should have the tools in place to deal with it. It won't be as easy as dealing with spammers with IPv4, but it can be done.
-Scott
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