Always verify your results Previous scan claimed 950 hosts up out of 4397, including hundreds of consecutive IPs which look like: Host: 216.163.140.210 () Status: Up Host: 216.163.140.211 () Status: Up Host: 216.163.140.212 () Status: Up Host: 216.163.140.213 () Status: Up Host: 216.163.140.214 () Status: Up Host: 216.163.140.215 () Status: Up Host: 216.163.140.216 () Status: Up Host: 216.163.140.217 () Status: Up Host: 216.163.140.218 () Status: Up Real hosts or relic of load balancer/firewall? Let's find out!