It usually happens that while I am reading an e-mail or viewing a stat report online, I want to quickly check the IP address information of sender. For instance just to see if the IP of sender is actually from the city the claimed person is in. This is not a big deal, I can copy and paste the IP too. But well that would not be me 😉
For this I had written a greasemonkey script at least a year and half ago, which surprisingly still works! It converts the IP format numbers in the page to links to www.dnsstuff.com IP information page. Only install greasemonkey using link #1, and then click on the link #2. Firefox will prompt to install this.