Lookup of 2.21.15.123
IP address: 2.21.15.123
Address type: IPv4
Host or reverse DNS (rDNS): a2-21-15-123.deploy.static.akamaitechnologies.com
Country: 
United Kingdom
2.21.15.123 does NOT belong to a private IP address block.
2.21.15.123 does NOT belong to a reserved IP address block.