Click on this URL: https://www.google.com/search?source=ig&hl=en&rlz=1G1SNNT_ENUS338&q=www.126.96.36.199&btnG=Google+Search
The results from the search engine are all related to Risky Connections, i.e., McAfee Has Blocked A Risky Connection. If you want to create a compound search string like this one - open your Google Browser and type in www.(IP Address) or check the entry of the search dialog box.
Copy and paste the Search String in Notepad. Remove the xxxx.xxx.xxx.xxx portion of the IP address and enter a suspect IP address. Run the search string with the modified address.
This is as good as it gets in sleuthing strange IP Addresses in pop-ups.