Internetworkers: http://www.ibiblio.org/internetworkers/

[zman <zman AT shell.neverwhere.org>]

On Wed, 13 Dec 2006, Steven Champeon wrote:
> Scott, there's a difference between host->IP mapping and IP->PTR
> mapping. No, there's nothing wrong with the former, but seeing multiples
> on the latter is very rare. I've only seen it (after looking at thousands
> of IPs over the last three years or more) on a few Mexican ISPs and very
> rarely outside of that.

Yes there is... maybe you should look at the blocks the ISP's and hosting 
companies are using and not just a block of IP's. We had already been 
doing it at NewSouth before I left there, and I'm sure they're still doing 
it with whatever their name is now. After going through an adress 
migration with ARIN there was no way that we could give each domain an 
individual IP. I'm not saying it's prevalent, but I wouldn't consider it 
rare by any means.

> No, it's very rare. Trust me. Or, pick any random set of IPs large enough
> to satisfy your curiousity and look at their PTRs.

Don't look through ServerBeach or RackSpace, you'll ruin your theory...


Scott H. Zekanis
zman AT kungfumonkey.com
http://www.rod-o-rama.com
http://www.thehellbenders.com
1957 Buick Riviera Hardtop (2 dr., 425" Nailhead)
1960 International B100
1923 Buick Roadster (Dual Quad 425" Nailhead) 
1990 Ducati 750 Sport