- - Yahoo
- -- Yahoo Publisher Contextual Advertising Network
- ---- YPN Experiment Revealed
gregbo - 9:45 pm on Oct 20, 2006 (gmt 0)
Hard to say, but one possibility is that these IPs have been generating excessive traffic on other sites.
Thread source: http://www.webmasterworld.com/yahoo_publisher_network/3128593.htm
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