An accurate Internet topology graph is important in many areas of networking, from deciding ISP business relationships to diagnosing network anomalies. Most Internet mapping efforts have derived the network structure, at the level of interconnected autonomous systems (ASes), from a limited number of either BGP- or traceroute-based data sources. While techniques for charting the topology continue to improve, the number of vantage points continues to shrink relative to the fast-paced growth of the Internet. This project introduces how to get a more complete AS topology from P2P users.