AS3257 172.121.160.0/20 CIDR and IP Range Summary.ASN: 3257 - GTT Communications Inc.Host Count: 4094Addressable IPs: 4096172.121.160.0/24172.121.161.0/24172.121.162.0/24172.121.163.0/24172.121.164.0/24172.121.165.0/24172.121.166.0/24172.121.167.0/24172.121.168.0/24172.121.169.0/24172.121.170.0/24172.121.171.0/24172.121.172.0/24172.121.173.0/24172.121.174.0/24172.121.175.0/24