AS20057 107.87.240.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048107.87.240.0/24107.87.241.0/24107.87.242.0/24107.87.243.0/24107.87.244.0/24107.87.245.0/24107.87.246.0/24107.87.247.0/24