Tracking down reverse for ip

I have a customer that has an IP of 12.43.95.126. Currently, I can not get any reverse on this IP. What is the best way to find out the responciable servers for this? Thanx in advance. ----------------------------------------------------------- Dennis Burgess, CCNA, Mikrotik Certified Trainer, MTCNA, MTCRE, MTCWE, MTCTCE, MTCUME Link Technologies, Inc -- Mikrotik & WISP Support Services Office: 314-735-0270 Website: http://www.linktechs.net <http://www.linktechs.net/> LIVE On-Line Mikrotik Training <http://www.onlinemikrotiktraining.com> - Author of "Learn RouterOS" <http://routerosbook.com/>