AS20057 166.204.32.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048166.204.32.0/24166.204.33.0/24166.204.34.0/24166.204.35.0/24166.204.36.0/24166.204.37.0/24166.204.38.0/24166.204.39.0/24