AS23520 190.242.72.0/21 CIDR and IP Range Summary.ASN: 23520 - Columbus Networks USA Inc.Host Count: 2046Addressable IPs: 2048190.242.72.0/24190.242.73.0/24190.242.74.0/24190.242.75.0/24190.242.76.0/24190.242.77.0/24190.242.78.0/24190.242.79.0/24