AS11712 72.157.240.0/20 CIDR and IP Range Summary.ASN: 11712 - AT&T Services Inc.Host Count: 4094Addressable IPs: 409672.157.240.0/2472.157.241.0/2472.157.242.0/2472.157.243.0/2472.157.244.0/2472.157.245.0/2472.157.246.0/2472.157.247.0/2472.157.248.0/2472.157.249.0/2472.157.250.0/2472.157.251.0/2472.157.252.0/2472.157.253.0/2472.157.254.0/2472.157.255.0/24