AS3900 216.166.16.0/20 CIDR and IP Range Summary.ASN: 3900 - Switch LtdHost Count: 4094Addressable IPs: 4096216.166.16.0/24216.166.17.0/24216.166.18.0/24216.166.19.0/24216.166.20.0/24216.166.21.0/24216.166.22.0/24216.166.23.0/24216.166.24.0/24216.166.25.0/24216.166.26.0/24216.166.27.0/24216.166.28.0/24216.166.29.0/24216.166.30.0/24216.166.31.0/24