AS3900 209.99.120.0/21 CIDR and IP Range Summary.ASN: 3900 - Switch LtdHost Count: 2046Addressable IPs: 2048209.99.120.0/24209.99.121.0/24209.99.122.0/24209.99.123.0/24209.99.124.0/24209.99.125.0/24209.99.126.0/24209.99.127.0/24