AS3257 5.178.16.0/21 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 2046Addressable IPs: 20485.178.16.0/245.178.17.0/245.178.18.0/245.178.19.0/245.178.20.0/245.178.21.0/245.178.22.0/245.178.23.0/24