AS20057 166.170.168.0/21 CIDR and IP Range Summary.ASN: 20057 - AT&T Mobility LLCHost Count: 2046Addressable IPs: 2048166.170.168.0/24166.170.169.0/24166.170.170.0/24166.170.171.0/24166.170.172.0/24166.170.173.0/24166.170.174.0/24166.170.175.0/24