AS3900 216.166.32.0/21 CIDR and IP Range Summary.ASN: 3900 - Switch LtdHost Count: 2046Addressable IPs: 2048216.166.32.0/24216.166.33.0/24216.166.34.0/24216.166.35.0/24216.166.36.0/24216.166.37.0/24216.166.38.0/24216.166.39.0/24