Distributed Hash Table (DHT) systems are an important part of peer-to-peer routing infrastructures. They enable scalable wide-area storage and retrieval of information, and will support the rapid development of a wide variety of Internet-scale applications ranging from naming systems and file systems to application-layer multicast. A lot of research about peer-to-peer systems, today, has been focusing on designing better structured peer-to-peer overlay networks or Distributed Hash Tables (DHTs). As far as we concern, not so many papers, however, have been published in an organized way to check the adaptability of the existing four DHTs namely Content Addressable Network (CAN), Chord, Pastry and Tapestry for mobile environments. This thesis presents an attempt to evaluate the performances of these DHTs including adaptability with mobile environments. For this we survey these DHTs including existing solutions and based on that we decide our own conclusion.