Ripper / lower whiskers中的Boxplot

I am using the most basic function of Boxplot, boxplot(x, ..., range = 1.5, but if I don't set the rang, and let R use its default value. Something like boxplot(x, ...,) what exactly quantile of the whiskers ? Because I have outliners that is larger or smaller than the upper/lower whiskers. How can I know the exact percentage of the outliners above or below the uper/lower whiskers? In other words, without setting the range, may I know what the percentage of the data is for the uper/lower whiskers? I am using the most basic function of Boxplot,