From 2-spyware.com
Xresolver is a scam website that abuses publicly available information to profit from players who use Xbox Live to play games online. Microsoft forums have recently been flooded with posts about the website, as it allows almost everybody to access the IP of a player based on his or her Gamertag. Based on this information, malicious actors can deliver Distributed Denial-of-Service (DDoS)[1] attacks, drop victims from the game, which allows unfair advantage within a particular game. Many users reported that the most affected games are Rainbow Six Siege, although other competitive games such as Call of Duty Black Ops 4.