We assume no obligation to update any forward-looking statements. As you listen to today's call, we will discuss certain non-GAAP financial measures and supplemental key performance metrics by revenue category, headcount and additional expense detail. This information, including reconciliations to the most comparable GAAP measures, can be found in today's earnings release and under our NeuStar Investor Relations tab on our website, www.neustar.biz.
With that, I'm pleased to introduce NeuStar's President and Chief Executive Officer, Lisa Hook. Lisa?
Lisa A. Hook
Thank you, Dave, and thank you all for joining us today as we report on NeuStar's results for the first quarter of 2012. I will offer some perspective on our strategy, on our execution and how they are reflected in our strong start to the year. Then Paul will walk you through a more detailed look at our results for the quarter.
In the first quarter, NeuStar's revenue was approximately $200 million, a 37% increase compared to the first quarter of 2011. While this marks the first full quarter with Information Services as part of our suite of service offerings, revenue increased across all operating segments. This record revenue generation led to a 16% year-over-year increase in adjusted net income.
Earnings in the first quarter were in line with our expectations and demonstrate our continued execution of the strategy we outlined in 2011. It is always my intention to state our expectations clearly and then to deliver on these expectations. NeuStar's performance in Q1 shows the progress we're making. Over the past year, NeuStar has continued its expansion from serving originally at the clearinghouse providing number portability to North America's telecommunications industry to becoming a leading provider of addressing, routing and policy management for the communications and Internet sectors.
We have used unique proprietary databases and analytical tools to create a second core business of realtime information and analytics based on addressing information. Our momentum in creating the second core business accelerated late last year with the acquisition of TARGUSinfo, which positions NeuStar to become the leading provider of realtime information and analytics derived from addresses, serving the telecommunications, Internet, marketing and media services industries. By broadening both the range of services we offer and the customers we serve, we have created significant opportunities for growth in 2012 and beyond.