AS20057 166.147.96.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048166.147.96.0/24166.147.97.0/24166.147.98.0/24166.147.99.0/24166.147.100.0/24166.147.101.0/24166.147.102.0/24166.147.103.0/24