AS20057 166.184.0.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048166.184.0.0/24166.184.1.0/24166.184.2.0/24166.184.3.0/24166.184.4.0/24166.184.5.0/24166.184.6.0/24166.184.7.0/24