Fast-Flux Service Network is a network of compromised computer systems with public DNS records that are constantly changing. In this paper, we collected DNS data from 300 different domain servers spanning 6 continents. Our engines worked for over 1600 hours on more than 23000 domains. With the tremendous DNS reply data, we are able to analyze the behavior of Fast-Flux Domain and Fast-Flux Service Network through different dimensions, and locate the most distinguishing features. This paper helps to reveal new features compared with previous researches, and verify the dynamic nature of Fast-Flux Service Network. Behavioral analysis of Fast-Flux Service Network also provides a view for malicious domain detection and network resource protection.