Sun java System Webserver (iplanet) browser information in logs

Add below partameter in log format :

"%Req->headers.user-agent%"

you can find below Access logs after adding the above paramter server.xml or customlog format through console and following with restart

Chrome :
127.0.0.1 - [13/Aug/2012:15:25:26 +0000] "GET /webservicesm HTTP/1.1" 200 "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/

Mozila :
127.0.0.1 - [13/Aug/2012:15:26:02 +0000] "GET /webservicesm HTTP/1.1" 200 "Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20100101 Firefox/11.0"

Internet Explorer :
127.0.0.1 - [13/Aug/2012:15:26:24 +0000] "GET /webservicesm.html HTTP/1.1" 200 "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; BTRS129225)"