I am using webalizer to generate statistics for my website on ubuntu 12.04 LTS.
I concatenate all the apache access.log files and make make a single big file.

Now i follow the step 1 in "How it Works" section here -

If you see the "Top 30 of 10484 Total Sites" section in http://www.webalizer.org/sample/usage_199905.html, you can see that the Hostname column is populated with the domain names not the IP addresses. Similar is the case in the section "Top 10 of 10484 Total Sites By KBytes".

Unfortunately I get IP addresses in the Hostname section. But the "Usage by location" pie chart at the bottom is working for me, so the Geo Location stuff works, but not for the domain names.

How can i solve this problem. Please help me out.