AS20057 107.81.16.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048107.81.16.0/24107.81.17.0/24107.81.18.0/24107.81.19.0/24107.81.20.0/24107.81.21.0/24107.81.22.0/24107.81.23.0/24