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| url = [http://www.ipni.org ipni.org]
| alexa = {{DecreasePositive}} positive decrease 355,329 ({{as of|2013|4|22|alt=2013.4}})<ref name="alexa">{{cite web|url= http://www.alexa.com/siteinfo/ipni.org |title= Ipni.org Site Info | publisher= [[Alexa Internet]] |accessdate= 2013-04-22 }}</ref><!--Updated monthly by OKBot.-->
| commercial = 否
| type = 資料庫