AS3900 209.99.24.0/21 CIDR and IP Range Summary.ASN: 3900 - Switch LtdHost Count: 2046Addressable IPs: 2048209.99.24.0/24209.99.25.0/24209.99.26.0/24209.99.27.0/24209.99.28.0/24209.99.29.0/24209.99.30.0/24209.99.31.0/24