Here’s an example of the fields Urchin utilizes:

Sample Log Entry:
24.69.48.15 ad.urchin.com - [02/Aug/2000:23:56:34 -0700] “GET/ads/sitereportimage.cgi;loc=25155?; HTTP /1.0” 302 270 “http://web-hosting.bc.ca/stats/200008/qreport.html” “Mozilla/4.0 (compatible; MSIE 5.01; Windows 98; netcom.ca CM)”

Field Definitions:

%h: Remote host
%v: The canonical ServerName of the server serving the request
%u: Remote user
%t: Time
%r: First line of request
%s: Status
%b: Bytes (size of file)
%{Referer}i: Referral - header line(s) in the request sent to the server
%{User-Agent}i: User Agent