Lookup of 3.91.42.10
IP address: 3.91.42.10
Address type: IPv4
Hostname or reverse DNS (rDNS): ec2-3-91-42-10.compute-1.amazonaws.com
Country: 
United States
3.91.42.10 does NOT belong to a private IP address block.
3.91.42.10 does NOT belong to a reserved IP address block.