ip2c

The ip2c (ip to country) application was developed to be a program to determine the country associated to a specific IP address.
The program queries the five main whois servers responsible for each region of the world and try to automatically establish the most authoritative for the IP specified. Then it return the countrys two-letter TLD (for example US), the extended country name (for example United States of America), its world region (for example North America) and a string containing a brief description of the organization managing the block of IP addresses containing the submitted IP (when available).
The program can also process a list of IPs stored in a comma delimited file and generate a new file with the country fields added to it. ip2c is a multithreaded application, and queries all the servers in parallel to minimize the overall response time.
ip2c is distributed as a console (or command line) application (ip2c.exe) and a Windows GUI application (ip2c_gui.exe). The features of the two versions are somewhat different and examined in more detail in the help file. As usual I wrote the program for my specific needs, but you are welcome to use it if you find it useful.