AS20057 166.216.152.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048166.216.152.0/24166.216.153.0/24166.216.154.0/24166.216.155.0/24166.216.156.0/24166.216.157.0/24166.216.158.0/24166.216.159.0/24