This paper presents an architecture which investigates the consistency of AS policies in all of the publicly accessible Internet Routing Registry (IRR) databases in the world. We also propose an architecture to prevent the increase of inconsistency. Since inconsistency hampers the connectivity between ASs, the consistency of IRR databases is crucial for the stable operation of the Internet. Through our investigations, we have found that a significant proportion of AS policies are either specified incorrectly or outdated. Based on this observation, we propose and implement a system that detects these inconsistencies and notifies operators so that they can be corrected. Finally, we evaluate these systems.