I would like to suggest a great software from Visualware called VisualRoute (which I am using). Great piece of software and you will not regret buying it. I have copied down a few notes of VisualRoute from the
Visualware homepage:
Quickly locate the source of Internet delays! VisualRoute provides an automated analysis and quick identification of where Internet connectivity problems occur.
Stop getting the run around from your ISP! VisualRoute enables you to easily provide domain and network administrators proof of Internet connectivity problems.
Find out where a Web site or IP address is located! VisualRoute identifies the actual city and country location, in addition to the WHOIS location, and the network being used.
See where hackers are located! Identify where threats to your system and information are coming from by locating where intrusion attempts originate.
Fight SPAM! Quickly identify and report Spammers and Internet abusers using VisualRoute's worldwide network provider contact information.
Know who you are communicating with! Use VisualRoute with eMailTrackerPro to determine where the sender of an email is located.